Diagnostic and treatment implications of psychosis secondary to treatable metabolic disorders in adults: a systematic review
Identifieur interne : 002E65 ( Pmc/Corpus ); précédent : 002E64; suivant : 002E66Diagnostic and treatment implications of psychosis secondary to treatable metabolic disorders in adults: a systematic review
Auteurs : Olivier Bonnot ; Hans Hermann Klünemann ; Frederic Sedel ; Sylvie Tordjman ; David Cohen ; Mark WalterfangSource :
- Orphanet Journal of Rare Diseases [ 1750-1172 ] ; 2014.
Abstract
It is important for psychiatrists to be aware of certain inborn errors of metabolism (IEMs) as these rare disorders can present as psychosis, and because definitive treatments may be available for treating the underlying metabolic cause. A systematic review was conducted to examine IEMs that often present with schizophrenia-like symptoms.
Published literature on MEDLINE was assessed regarding diseases of homocysteine metabolism (DHM; cystathionine beta-synthase deficiency [CbS-D] and homocysteinemia due to methyltetrahydrofolate reductase deficiency [MTHFR-D]), urea cycle disorders (UCD), acute porphyria (POR), Wilson disease (WD), cerebrotendinous-xanthomatosis (CTX) and Niemann-Pick disease type C (NP-C).
Case reports, case series or reviews with original data regarding psychiatric manifestations and cognitive impairment published between January 1967 and June 2012 were included based on a standardized four-step selection process.
All selected articles were evaluated for descriptions of psychiatric signs (type, severity, natural history and treatment) in addition to key disease features.
A total of 611 records were identified. Information from CbS-D (n = 2), MTHFR-D (n = 3), UCD (n = 8), POR (n = 12), WD (n = 11), CTX (n = 14) and NP-C publications (n = 9) were evaluated. Six non-systematic literature review publications were also included. In general, published reports did not provide explicit descriptions of psychiatric symptoms. The literature search findings are presented with a didactic perspective, showing key features for each disease and psychiatric signs that should trigger psychiatrists to suspect that psychotic symptoms may be secondary to an IEM.
IEMs with a psychiatric presentation and a lack of, or sub-clinical, neurological signs are rare, but should be considered in patients with atypical psychiatric symptoms.
Url:
DOI: 10.1186/1750-1172-9-65
PubMed: 24775716
PubMed Central: 4043981
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Diagnostic and treatment implications of psychosis secondary to treatable metabolic disorders in adults: a systematic review</title><author><name sortKey="Bonnot, Olivier" sort="Bonnot, Olivier" uniqKey="Bonnot O" first="Olivier" last="Bonnot">Olivier Bonnot</name><affiliation><nlm:aff id="I1">Department of Child and Adolescent Psychiatry, Centre Hospitalier Universitaire de Nantes, Hôpital Mère-Enfant, 7 quai Moncousu, 44 000 Nantes, France</nlm:aff></affiliation><affiliation><nlm:aff id="I7">GDR3557-Institut de Psychiatrie, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Klunemann, Hans Hermann" sort="Klunemann, Hans Hermann" uniqKey="Klunemann H" first="Hans Hermann" last="Klünemann">Hans Hermann Klünemann</name><affiliation><nlm:aff id="I2">Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie der Universität Regensburg am Bezirksklinikum, Regensburg, Germany</nlm:aff></affiliation></author><author><name sortKey="Sedel, Frederic" sort="Sedel, Frederic" uniqKey="Sedel F" first="Frederic" last="Sedel">Frederic Sedel</name><affiliation><nlm:aff id="I3">Department of Neurology and Reference Center for Lysosomal Diseases, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Tordjman, Sylvie" sort="Tordjman, Sylvie" uniqKey="Tordjman S" first="Sylvie" last="Tordjman">Sylvie Tordjman</name><affiliation><nlm:aff id="I4">Department of Child and Adolescent Psychiatry, Centre Hospitalier Guillaume Regnier, University of Rennes, Rennes, France</nlm:aff></affiliation></author><author><name sortKey="Cohen, David" sort="Cohen, David" uniqKey="Cohen D" first="David" last="Cohen">David Cohen</name><affiliation><nlm:aff id="I5">Department of Child and Adolescent Psychiatry and Reference Center for Rare Diseases with Psychiatric Symptoms, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Walterfang, Mark" sort="Walterfang, Mark" uniqKey="Walterfang M" first="Mark" last="Walterfang">Mark Walterfang</name><affiliation><nlm:aff id="I6">Neuropsychiatry Unit, Royal Melbourne Hospital, Melbourne, Australia & Melbourne Neuropsychiatry Centre, University of Melbourne, Melbourne, Australia</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">24775716</idno><idno type="pmc">4043981</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4043981</idno><idno type="RBID">PMC:4043981</idno><idno type="doi">10.1186/1750-1172-9-65</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">002E65</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">002E65</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Diagnostic and treatment implications of psychosis secondary to treatable metabolic disorders in adults: a systematic review</title><author><name sortKey="Bonnot, Olivier" sort="Bonnot, Olivier" uniqKey="Bonnot O" first="Olivier" last="Bonnot">Olivier Bonnot</name><affiliation><nlm:aff id="I1">Department of Child and Adolescent Psychiatry, Centre Hospitalier Universitaire de Nantes, Hôpital Mère-Enfant, 7 quai Moncousu, 44 000 Nantes, France</nlm:aff></affiliation><affiliation><nlm:aff id="I7">GDR3557-Institut de Psychiatrie, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Klunemann, Hans Hermann" sort="Klunemann, Hans Hermann" uniqKey="Klunemann H" first="Hans Hermann" last="Klünemann">Hans Hermann Klünemann</name><affiliation><nlm:aff id="I2">Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie der Universität Regensburg am Bezirksklinikum, Regensburg, Germany</nlm:aff></affiliation></author><author><name sortKey="Sedel, Frederic" sort="Sedel, Frederic" uniqKey="Sedel F" first="Frederic" last="Sedel">Frederic Sedel</name><affiliation><nlm:aff id="I3">Department of Neurology and Reference Center for Lysosomal Diseases, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Tordjman, Sylvie" sort="Tordjman, Sylvie" uniqKey="Tordjman S" first="Sylvie" last="Tordjman">Sylvie Tordjman</name><affiliation><nlm:aff id="I4">Department of Child and Adolescent Psychiatry, Centre Hospitalier Guillaume Regnier, University of Rennes, Rennes, France</nlm:aff></affiliation></author><author><name sortKey="Cohen, David" sort="Cohen, David" uniqKey="Cohen D" first="David" last="Cohen">David Cohen</name><affiliation><nlm:aff id="I5">Department of Child and Adolescent Psychiatry and Reference Center for Rare Diseases with Psychiatric Symptoms, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</nlm:aff></affiliation></author><author><name sortKey="Walterfang, Mark" sort="Walterfang, Mark" uniqKey="Walterfang M" first="Mark" last="Walterfang">Mark Walterfang</name><affiliation><nlm:aff id="I6">Neuropsychiatry Unit, Royal Melbourne Hospital, Melbourne, Australia & Melbourne Neuropsychiatry Centre, University of Melbourne, Melbourne, Australia</nlm:aff></affiliation></author></analytic><series><title level="j">Orphanet Journal of Rare Diseases</title><idno type="eISSN">1750-1172</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><sec><title>Objective</title><p>It is important for psychiatrists to be aware of certain inborn errors of metabolism (IEMs) as these rare disorders can present as psychosis, and because definitive treatments may be available for treating the underlying metabolic cause. A systematic review was conducted to examine IEMs that often present with schizophrenia-like symptoms.</p></sec><sec><title>Data sources</title><p>Published literature on MEDLINE was assessed regarding diseases of homocysteine metabolism (DHM; cystathionine beta-synthase deficiency [CbS-D] and homocysteinemia due to methyltetrahydrofolate reductase deficiency [MTHFR-D]), urea cycle disorders (UCD), acute porphyria (POR), Wilson disease (WD), cerebrotendinous-xanthomatosis (CTX) and Niemann-Pick disease type C (NP-C).</p></sec><sec><title>Study selection</title><p>Case reports, case series or reviews with original data regarding psychiatric manifestations and cognitive impairment published between January 1967 and June 2012 were included based on a standardized four-step selection process.</p></sec><sec><title>Data extraction</title><p>All selected articles were evaluated for descriptions of psychiatric signs (type, severity, natural history and treatment) in addition to key disease features.</p></sec><sec><title>Results</title><p>A total of 611 records were identified. Information from CbS-D (n = 2), MTHFR-D (n = 3), UCD (n = 8), POR (n = 12), WD (n = 11), CTX (n = 14) and NP-C publications (n = 9) were evaluated. Six non-systematic literature review publications were also included. In general, published reports did not provide explicit descriptions of psychiatric symptoms. The literature search findings are presented with a didactic perspective, showing key features for each disease and psychiatric signs that should trigger psychiatrists to suspect that psychotic symptoms may be secondary to an IEM.</p></sec><sec><title>Conclusion</title><p>IEMs with a psychiatric presentation and a lack of, or sub-clinical, neurological signs are rare, but should be considered in patients with atypical psychiatric symptoms.</p></sec></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Price, G" uniqKey="Price G">G Price</name></author><author><name sortKey="Ron, Ma" uniqKey="Ron M">MA Ron</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Davison, K" uniqKey="Davison K">K Davison</name></author><author><name sortKey="Bagley, Cr" uniqKey="Bagley C">CR Bagley</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Johnstone, Ec" uniqKey="Johnstone E">EC 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Orphanet J Rare Dis</journal-id><journal-id journal-id-type="iso-abbrev">Orphanet J Rare Dis</journal-id><journal-title-group><journal-title>Orphanet Journal of Rare Diseases</journal-title></journal-title-group><issn pub-type="epub">1750-1172</issn><publisher><publisher-name>BioMed Central</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">24775716</article-id><article-id pub-id-type="pmc">4043981</article-id><article-id pub-id-type="publisher-id">1750-1172-9-65</article-id><article-id pub-id-type="doi">10.1186/1750-1172-9-65</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review</subject></subj-group></article-categories><title-group><article-title>Diagnostic and treatment implications of psychosis secondary to treatable metabolic disorders in adults: a systematic review</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes" id="A1"><name><surname>Bonnot</surname><given-names>Olivier</given-names></name><xref ref-type="aff" rid="I1">1</xref><xref ref-type="aff" rid="I7">7</xref><email>olivier.bonnot@chu-nantes.fr</email></contrib><contrib contrib-type="author" id="A2"><name><surname>Klünemann</surname><given-names>Hans Hermann</given-names></name><xref ref-type="aff" rid="I2">2</xref><email>Hans.Kluenemann@medbo.de</email></contrib><contrib contrib-type="author" id="A3"><name><surname>Sedel</surname><given-names>Frederic</given-names></name><xref ref-type="aff" rid="I3">3</xref><email>frederic.sedel@psl.aphp.fr</email></contrib><contrib contrib-type="author" id="A4"><name><surname>Tordjman</surname><given-names>Sylvie</given-names></name><xref ref-type="aff" rid="I4">4</xref><email>s.tordjman@ch-guillaumeregnier.fr</email></contrib><contrib contrib-type="author" id="A5"><name><surname>Cohen</surname><given-names>David</given-names></name><xref ref-type="aff" rid="I5">5</xref><email>david.cohen@psl.aphp.fr</email></contrib><contrib contrib-type="author" id="A6"><name><surname>Walterfang</surname><given-names>Mark</given-names></name><xref ref-type="aff" rid="I6">6</xref><email>Mark.Walterfang@mh.org.au</email></contrib></contrib-group><aff id="I1"><label>1</label>Department of Child and Adolescent Psychiatry, Centre Hospitalier Universitaire de Nantes, Hôpital Mère-Enfant, 7 quai Moncousu, 44 000 Nantes, France</aff><aff id="I2"><label>2</label>Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie der Universität Regensburg am Bezirksklinikum, Regensburg, Germany</aff><aff id="I3"><label>3</label>Department of Neurology and Reference Center for Lysosomal Diseases, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</aff><aff id="I4"><label>4</label>Department of Child and Adolescent Psychiatry, Centre Hospitalier Guillaume Regnier, University of Rennes, Rennes, France</aff><aff id="I5"><label>5</label>Department of Child and Adolescent Psychiatry and Reference Center for Rare Diseases with Psychiatric Symptoms, Groupe Hospitalier Pitié-Salpêtrière, Paris, France</aff><aff id="I6"><label>6</label>Neuropsychiatry Unit, Royal Melbourne Hospital, Melbourne, Australia & Melbourne Neuropsychiatry Centre, University of Melbourne, Melbourne, Australia</aff><aff id="I7"><label>7</label>GDR3557-Institut de Psychiatrie, Paris, France</aff><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>28</day><month>4</month><year>2014</year></pub-date><volume>9</volume><fpage>65</fpage><lpage>65</lpage><history><date date-type="received"><day>6</day><month>11</month><year>2013</year></date><date date-type="accepted"><day>24</day><month>3</month><year>2014</year></date></history><permissions><copyright-statement>Copyright © 2014 Bonnot et al.; licensee BioMed Central Ltd.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder>Bonnot et al.; licensee BioMed Central Ltd.</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/2.0"><license-p>This is an Open Access article distributed under the terms of the Creative Commons Attribution License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/2.0">http://creativecommons.org/licenses/by/2.0</ext-link>), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>) applies to the data made available in this article, unless otherwise stated.</license-p></license></permissions><self-uri xlink:href="http://www.ojrd.com/content/9/1/65"></self-uri><abstract><sec><title>Objective</title><p>It is important for psychiatrists to be aware of certain inborn errors of metabolism (IEMs) as these rare disorders can present as psychosis, and because definitive treatments may be available for treating the underlying metabolic cause. A systematic review was conducted to examine IEMs that often present with schizophrenia-like symptoms.</p></sec><sec><title>Data sources</title><p>Published literature on MEDLINE was assessed regarding diseases of homocysteine metabolism (DHM; cystathionine beta-synthase deficiency [CbS-D] and homocysteinemia due to methyltetrahydrofolate reductase deficiency [MTHFR-D]), urea cycle disorders (UCD), acute porphyria (POR), Wilson disease (WD), cerebrotendinous-xanthomatosis (CTX) and Niemann-Pick disease type C (NP-C).</p></sec><sec><title>Study selection</title><p>Case reports, case series or reviews with original data regarding psychiatric manifestations and cognitive impairment published between January 1967 and June 2012 were included based on a standardized four-step selection process.</p></sec><sec><title>Data extraction</title><p>All selected articles were evaluated for descriptions of psychiatric signs (type, severity, natural history and treatment) in addition to key disease features.</p></sec><sec><title>Results</title><p>A total of 611 records were identified. Information from CbS-D (n = 2), MTHFR-D (n = 3), UCD (n = 8), POR (n = 12), WD (n = 11), CTX (n = 14) and NP-C publications (n = 9) were evaluated. Six non-systematic literature review publications were also included. In general, published reports did not provide explicit descriptions of psychiatric symptoms. The literature search findings are presented with a didactic perspective, showing key features for each disease and psychiatric signs that should trigger psychiatrists to suspect that psychotic symptoms may be secondary to an IEM.</p></sec><sec><title>Conclusion</title><p>IEMs with a psychiatric presentation and a lack of, or sub-clinical, neurological signs are rare, but should be considered in patients with atypical psychiatric symptoms.</p></sec></abstract><kwd-group><kwd>Inborn errors of metabolism</kwd><kwd>Organic psychosis</kwd><kwd>Schizophrenia-like symptoms</kwd><kwd>Atypical psychosis</kwd></kwd-group></article-meta></front><body><sec sec-type="intro"><title>Introduction</title><p>A range of medical conditions may be associated with schizophrenia-like psychosis [<xref ref-type="bibr" rid="B1">1</xref>]. The landmark review of psychosis associated with organic disorders by Davison and Bagley, which utilized the 1957 WHO operational criteria for schizophrenia, highlighted a number of disorders where the association with psychosis significantly exceeded chance [<xref ref-type="bibr" rid="B2">2</xref>]. Many of the disorders identified showed pathology in the temporal lobe and diencephalon.</p><p>A large study of 268 consecutive patients with first-episode psychosis found that 6% had organic cerebral disease that was potentially causally linked with psychiatric symptoms [<xref ref-type="bibr" rid="B3">3</xref>], which emphasizes the importance of a thorough diagnostic evaluation to exclude underlying medical illness at first presentation. Recently, more than 60 different congenital conditions associated with psychosis were reviewed. Interestingly, some of them are not associated with dysmorphia, mental retardation or prominent neurological features that may otherwise trigger a search for an organic cause of illness [<xref ref-type="bibr" rid="B4">4</xref>].</p><p>The diagnosis of medical or neurological illnesses underlying psychosis is of great importance as many of these conditions are progressive or fatal, associated with significant additional medical comorbidity, and may be partially or entirely reversible with definitive treatment. Inborn errors of metabolism (IEMs) represent a particular focus for research as they are frequently under-detected or misdiagnosed, a number are treatable, and new diagnostic methods and therapies have become available.</p><p>IEMs are a group of diseases that generally result from the absence or deficiency of an intracellular component of a metabolic pathway (usually, but not exclusively, an enzyme), which may lead to altered intracellular synthesis and catabolism [<xref ref-type="bibr" rid="B5">5</xref>]. There are hundreds of IEMs, and many remain poorly characterized. Most result in clinical disease due to the accumulation of substances that are toxic to, or interfere with, normal cellular function, or which may be due to the effects of a reduced ability to synthesize essential compounds.</p><p>The overall incidence of IEMs has been estimated to be approximately 40 cases per 100 000 live births [<xref ref-type="bibr" rid="B6">6</xref>]. However, this rate may be an underestimation, as new disorders continue to be discovered and characterized and because diagnostic techniques continue to improve in sensitivity and accuracy.</p><p>Up to 80% of IEMs are diagnosed during childhood, but an increasing recognition of late-onset presentations has recently raised awareness and diagnoses of adult-onset forms [<xref ref-type="bibr" rid="B7">7</xref>]. A number of adult-onset IEMs are associated with schizophrenia-like symptoms, including diseases of homocysteine metabolism (DHM), urea cycle disorders (UCD), porphyria (POR), Wilson disease (WD), cerebrotendinous xanthomatosis (CTX) and Niemann-Pick disease type C (NP-C) [<xref ref-type="bibr" rid="B7">7</xref>].</p><p>This article reports findings from a systematic literature review and provides a guide for the diagnosis of treatable IEMs associated with schizophrenia-like symptoms based on the review findings. The major features of IEMs that can be associated with psychosis are summarized, and a diagnostic algorithm to assist psychiatrists in the detection of atypical symptoms is proposed that may be related to underlying IEMs.</p></sec><sec sec-type="methods"><title>Methods</title><sec><title>Review scope</title><p>A meeting was held in mid-2012 to decide which IEMs associated with psychosis are currently treatable, with the aim of conducting a systematic bibliographic search to address the clinical challenges associated with these conditions. Based on a consensus reached during that meeting, the following seven IEMs were chosen as a focus for this review: homocysteinemia due to methyltetrahydrofolate reductase deficiency (MTHFR-D), cystathionine beta-synthase deficiency (CbS-D), UCD, POR, WD, CTX and NP-C.</p></sec><sec><title>Literature search methodology and data sources</title><p>The public MEDLINE database was searched according to a standard four-step protocol, as described in the following sections and summarized in Figure <xref ref-type="fig" rid="F1">1</xref>.</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>Summary of literature review process.</p></caption><graphic xlink:href="1750-1172-9-65-1"></graphic></fig><sec><title>Identification</title><p>All terms, including complete names and abbreviations for MTHFR-D, CbS-D, UCD, POR, WD, CTX and NP-C were searched alongside the generic tag, ‘psy*’ using EndNote X5 software (Thomson Reuters), which enabled the identification and deletion of any duplicates. In total, 708 potentially relevant records published between January 1967 and June 2012 were identified, from which 97 duplicate records were removed. Seven separate EndNote databases were created – one for each IEM. The numbers of articles for each IEM database were: MTHFR-D (n = 12); CbS-D (n = 6); UCD (n = 15); POR (n = 75); WD (n = 451); CTX (n = 15); and NP-C (n = 31). Six non-systematic literature reviews were also identified and included [<xref ref-type="bibr" rid="B7">7</xref>-<xref ref-type="bibr" rid="B12">12</xref>]. A total of 611 records were collated for screening.</p></sec><sec><title>Screening</title><p>Two groups worked separately in screening abstracts from relevant articles from the literature review (Group 1: M. Walterfang and H.H. Kluenemann. Group 2: O. Bonnot, D. Cohen, Sylvie Tordjman and F. Sedel). Case reports, case series with original data regarding psychiatric manifestations and cognitive impairments, and previous reviews containing relevant data were selected. Articles were excluded from full text analysis (see ‘<italic>Eligibility’</italic> stage) according to the following exclusion criteria: 1) the article mentioned psychiatric manifestations without data pertaining to any of the seven chosen treatable diseases; 2) an unrelated article, mentioning an IEM without describing psychiatric presentations; 3) literature reviews not containing any new data and; 4) data already reported elsewhere. Screening excluded 26 of the initial records from the POR database and 400 records from the WD database. In cases where the two analysis groups did not agree, records were kept and included in the next step.</p></sec><sec><title>Eligibility</title><p>The same two analysis groups accessed the full texts of all remaining articles (n = 185) and checked them further for eligibility according to the same exclusion criteria used in the abstract screening stage. The numbers of articles considered eligible after this process were: MTHFR-D (n = 12), CbS-D (n = 6), UCD (n = 15), POR (n = 49), WD (n = 51), CTX (n = 15) and NP-C (n = 31). The six previous reviews were also kept.</p></sec><sec><title>Inclusion</title><p>Among the eligible records, information on key IEM disease features as well as psychiatric manifestations was included from the following numbers of publications, per database: MTHFR-D (n = 3); CbS-D (n = 2); UCD (n = 8); POR (n = 12); WD (n = 11); CTX (n = 14) and; NP-C (n = 9). Including the six previous reviews, this brought the final total of source articles to 59.</p></sec></sec></sec><sec sec-type="results"><title>Results</title><p>To understand the metabolic pathways implicated in these disorders, we will provide an explanation in the text referring directly to the cited diseases. For figures and complete presentation, we refer the reader to the KFGG website which illustrates theses pathways in detail [<xref ref-type="bibr" rid="B13">13</xref>].</p><sec><title>Disorders of homocysteine metabolism (DHMs)</title><p>CbS-D and MTHFR-D are two key DHMs that commonly feature psychiatric signs.</p><sec><title>Key features of CbS-D</title><p>Homocysteinuria due to CbS-D is characterized by the involvement of the ocular, skeletal, central nervous and vascular systems. Prevalence is estimated around 1/344 000 birth in countries were systematic search of CbS <italic>deficiency</italic> is provided for every newborn, however recent data from systematic search for CbS <italic>mutation</italic> show important prevalence up to 1/20 000 [<xref ref-type="bibr" rid="B14">14</xref>]. Two articles that addressed psychiatric symptoms and psychosis were identified [<xref ref-type="bibr" rid="B15">15</xref>,<xref ref-type="bibr" rid="B16">16</xref>]. The disease is an autosomal recessive disorder of methionine metabolism, caused by mutations in the <italic>CbS</italic> gene (21q22.3). CbS normally converts homocysteine to cystathionine in the trans-sulfuration pathway of the methionine cycle, and requires pyridoxal 5-phosphate as a cofactor. The other two cofactors involved in methionine remethylation include vitamin B<sub>12</sub> and folic acid. Clinical diagnosis of CbS-D is confirmed by blood amino acid analysis (including total homocysteine measurement), assays of CbS enzyme activity, or screening for <italic>CbS</italic> mutations.</p><p>Patients appear normal at birth but display a progressive disease course if left untreated. Eye anomalies include ectopia lentis (in 85% of cases) and high myopia. Skeletal changes include genu valgum and pes cavus, followed by dolichostenomelia, pectus excavatum or carinatum, kyphoscoliosis and osteoporosis. A Marfan-like body habitus may occur, with tall stature and arachnodactyly. Thromboembolism affecting both large and small arteries and veins is the most striking cause of morbidity and mortality, and affects 25% of individuals by the age of 15 years. While some individuals have a normal IQ, mental retardation is common and, when present, may progress if the disorder is left untreated. Brittle hair and livedo reticularis have also been reported.</p></sec><sec><title>Psychiatric signs associated with CbS-D</title><p>In one of the few studies in this field, psychiatric illness was found in 51% of cases overall, with symptoms falling into four diagnostic categories: episodic depression (10%), chronic disorders of behavior (17%), obsessive-compulsive disorder (5%), and personality disorder (19%) [<xref ref-type="bibr" rid="B15">15</xref>]. In the same study, aggressive behavior and other conduct disorders were particularly common among patients with mental retardation and those who were nonresponsive to vitamin B<sub>6</sub>. In some cases, psychiatric symptoms may be the initial presenting symptom with no neurological signs [<xref ref-type="bibr" rid="B16">16</xref>].</p></sec><sec><title>Key features of MTHFR-D</title><p>MTHFR-D is another autonomic recessive trait, and is caused by mutations in the 5,10-methylenetetrahydrofolate reductase (<italic>MTHFR</italic>) gene (1p36.3). MTHFR deficiency results in abnormal intracellular folic acid metabolism, and prevents reduction of 5–10 methylenetetrahydrofolate to 5-methyltetrahydrofolate – the methyl donor for the remethylation of homocysteine into methionine. As a result, the disorder leads to MTHFR-D and consequently to homocysteinuria and hypomethioninemia. To our knowledge prevalence is unknown.</p><p>The onset of MTHFR-D usually occurs during the first year of life, characterized by severe neurological signs, recurrent apnea, microcephaly and convulsions without megaloblastic anemia. However, there are some forms with onset during childhood, adolescence or adulthood that present with mental regression, ataxia and schizophrenia-like psychosis. Other symptoms such as sub-acute degeneration of the spinal cord have been reported.</p><p>Diagnoses of DHM are made through analysis of amino acids by chromatography and total plasma homocysteine measurement; an elevated level is defined at >100 micromol/L [<xref ref-type="bibr" rid="B17">17</xref>]. Methionine levels may be useful, as they are decreased in MTHFR-D and increased in CbS-D.</p><p>There are currently three recognized treatment modalities for DHM. For pyridoxine-responsive patients, treatment with pharmacological doses of pyridoxine combined with folic acid and vitamin B<sub>12</sub> supplements is recommended. In pyridoxine non-responsive patients, the treatment should comprise a methionine-restricted, cysteine-supplemented diet in combination with the pyridoxine, folic acid and vitamin B<sub>12</sub> supplementation. Betaine anhydrous is a methyl donor that may lead to lowering of homocysteine levels in MTHFR-D patients, and can be used as an adjunct to such a diet.</p><p>Homocysteine is cleared by transulfuration to cysteine and glutathione, an important antioxidant. Transulfuration requires vitamins B<sub>6</sub> and B<sub>12</sub>. Treatment with vitamin B<sub>6</sub>, a precursor of homocysteine, can be effective in treating psychiatric symptoms if instituted early [<xref ref-type="bibr" rid="B7">7</xref>].</p></sec><sec><title>Psychiatric signs associated with MTHFR-D</title><p>Three articles were identified from the systematic literature review [<xref ref-type="bibr" rid="B18">18</xref>-<xref ref-type="bibr" rid="B20">20</xref>]. Psychiatric symptoms are not uncommon in MTHFR-D, and may be the presenting symptom [<xref ref-type="bibr" rid="B18">18</xref>]. Their onset may be acute or may follow a more insidious course. Acute manifestations occur mainly after surgery, and present with visual and/or auditory hallucinations, thought disorder and delusions [<xref ref-type="bibr" rid="B18">18</xref>]. Roze and colleagues describe two siblings (16- and 24-year-old women) with presumed late-onset MTHFR-D. Three years after the diagnosis of her older sister, the 16-year-old sister was initially seen with a 3-month history of dissociative symptoms and delusions of persecution with visual and auditory hallucinations. One month prior to hospital admission, she had also developed an unsteady gait and urinary incontinence. She was previously healthy and had been an average student. Physical examination on admission showed only an areflexic paraparesis with an extensor plantar response on the right side and impaired vibration and position sense in the lower limbs. Diagnosis was made because her sister was known to have the disease. Combined daily treatment with intravenous hydroxocobalamin (2 mg), oral betaine (9 g), L-carnitine (3 g), and folinic acid (10 mg) was started, and a dramatic clinical improvement, with the recovery of arm function and the disappearance of psychotic features and lethargy, was observed after 6 weeks.</p><p>In a different approach, a recent meta-analysis examining the association between <italic>MTHFR</italic> gene polymorphisms and psychiatric disorders demonstrated a strong association between the <italic>MTHFR</italic> C677T gene variant and unipolar depression, schizophrenia and bipolar disorder, with odds ratios of 1.36, 1.44 and 1.82, respectively [<xref ref-type="bibr" rid="B20">20</xref>]. Notably, the metabolic syndrome secondary to antipsychotic medication may be more frequent in patients with reduced MTHFR activity associated with schizophrenia-like psychosis [<xref ref-type="bibr" rid="B21">21</xref>].</p><p>It is well documented that aberrant methylated compounds are linked to mental state and behavior. A recent review of the ‘one-carbon metabolism hypothesis’ described a range of factors that can contribute to folate and/or vitamin B<sub>12</sub> deficiency [<xref ref-type="bibr" rid="B22">22</xref>]. Moreover, folic acid is a water-soluble B vitamin involved in the synthesis, repair and methylation of DNA, leading to epigenetic regulation of crucial developmental genes implicated in the pathogenesis of schizophrenia [<xref ref-type="bibr" rid="B23">23</xref>,<xref ref-type="bibr" rid="B24">24</xref>]. Deficiency of B vitamins leads to an increased level of homocysteine, which is a highly toxic metabolite to neural and vascular development [<xref ref-type="bibr" rid="B25">25</xref>]. Elevated serum levels of homocysteine have also been shown to be associated with schizophrenia, although the evidence is far from conclusive [<xref ref-type="bibr" rid="B26">26</xref>,<xref ref-type="bibr" rid="B27">27</xref>].</p></sec></sec><sec><title>Urea cycle disorders (UCDs)</title><sec><title>Key features</title><p>The urea cycle is the metabolic process by which the body eliminates nitrogen. Six enzymes take part in this process; a deficiency of any one of them disrupts this pathway and results in excess nitrogen accumulating in the body in the form of ammonia. The six UCDs include deficiency of: 1) carbamyl phosphate synthetase; 2) n-acetylglutamate synthetase; 3) ornithine transcarbamylase; 4) argininosuccinic acid synthetase (also called citrullinemia); 5) argininosuccinase acid lyase and; 6) arginase. UCD has an estimated incidence of 1:8.000 [<xref ref-type="bibr" rid="B28">28</xref>].</p><p>If the enzyme deficiency is severe, symptoms will be present at birth and can present as irritability, nausea and vomiting followed by lethargy, seizures and poor muscle tone. If left untreated, patients can develop respiratory distress or fall victim to coma or premature death due to pathological levels of ammonia in the blood.</p><p>If the enzyme deficiency is partial, symptom onset may not occur until childhood or adulthood. In such cases, symptoms may include nausea and vomiting associated with headache and a clouded sensorium in the context of infection or a high-protein diet. Medications may worsen or trigger the disease, particularly corticosteroids and sodium valproate.</p><p>There is no cure for UCDs, although prompt diagnosis allows measures to be taken that can reduce the consequences of hyperammonemia. Measurement of plasma ammonemia is key to the diagnosis of UCDs, and treatment consisting of a protein-restricted diet and special supplements is essential [<xref ref-type="bibr" rid="B29">29</xref>]. In addition, several medications including sodium benzoate, sodium phenylacetate and sodium phenylbutyrate can bind with ammonia and remove it from the circulation. Hemodialysis may represent an alternative treatment, especially in emergency situations [<xref ref-type="bibr" rid="B30">30</xref>].</p></sec><sec><title>Psychiatric signs</title><p>Eight relevant articles were identified in the literature review [<xref ref-type="bibr" rid="B31">31</xref>-<xref ref-type="bibr" rid="B38">38</xref>]. Arn and colleagues [<xref ref-type="bibr" rid="B31">31</xref>] reported a 21-year-old white woman who presented 8 days postpartum with headache and confusion, and became uncommunicative. She was admitted to a psychiatric hospital and diagnosed with postpartum depression. Within 24 hours of admission (11 days postpartum) she became comatose and had generalized tonic–clonic seizures, decorticate posturing, and papilledema. She was treated successfully with hemodialysis and received intravenous sodium benzoate and arginine hydrochloride. Enns and colleagues reported a similar case, suggesting that UCD may present initially with postpartum psychiatric symptoms and may represent an under-recognized cause of ‘postpartum psychosis.’ [<xref ref-type="bibr" rid="B32">32</xref>]</p><p>Interestingly, late-onset (between 13 and 48 years of age in our review) UCD may present with behavioral and hallucinatory psychiatric and organic signs, often featuring vomiting, which is clearly a key trigger sign for the consideration of UCD in psychiatric situations [<xref ref-type="bibr" rid="B35">35</xref>-<xref ref-type="bibr" rid="B37">37</xref>]. Patients may have a history of anorexia and atypical depression [<xref ref-type="bibr" rid="B35">35</xref>] or psychosis [<xref ref-type="bibr" rid="B36">36</xref>], often with associated confusion [<xref ref-type="bibr" rid="B37">37</xref>].</p></sec></sec><sec><title>Acute porphyria (POR)</title><sec><title>Key features</title><p>The PORs comprise a group of eight hereditary metabolic diseases characterized by intermittent neurovisceral manifestations, cutaneous lesions, or the combination of both. All porphyrias are caused by a deficiency in one of the enzymes of the heme biosynthesis pathway. These deficiencies result in an accumulation of porphyrins and/or their precursors – delta-aminolevulinic acid (ALA) and porphobilinogen (PBG) – in the liver or bone marrow. Neurological manifestations are caused by the neurotoxic effects of these precursors, particularly ALA. Prevalence is estimated around 0.54:100 000 [<xref ref-type="bibr" rid="B39">39</xref>].</p><p>Enzyme deficiencies in the porphyrias result from mutations of the correspondingly coded genes, and transmission of hereditary porphyrias occurs in either an autosomal dominant fashion with weak penetrance, or in a recessive manner with complete penetrance.</p><p>Clinical signs of disease usually appear in adulthood, although some porphyrias affect children. Porphyrias are classified into two groups – hepatic and erythropoietic – according to the main location of the metabolic anomaly. Chronic hepatic porphyrias and erythropoietic porphyrias manifest with bullous cutaneous lesions or acute pain in areas exposed to the sun, without neurological symptoms. However, neuro-visceral attacks occur in patients with acute hepatic porphyrias, manifesting as intense abdominal pain (often associated with nausea, vomiting and constipation), and neurological and psychological symptoms. Two acute hepatic porphyrias (variegate porphyria and hereditary coproporphyria) may also present with cutaneous photosensitivity.</p><p>Diagnosis is mainly based on the measurement of porphyrins and their precursors in biological samples such as urine, stools and blood. The key diagnostic procedure is the measurement of ALA and PBG in urine. Genetic counseling should be offered to affected families to identify individuals susceptible to developing and transmitting the disease. Acute attacks should be treated urgently with an injection of human hemin and/or perfusion of carbohydrates.</p></sec><sec><title>Psychiatric signs</title><p>Twelve relevant articles were included from the systematic literature review. Psychiatric manifestations are widely known and well documented [<xref ref-type="bibr" rid="B40">40</xref>-<xref ref-type="bibr" rid="B43">43</xref>], occurring in 24–70% of patients in acute porphyria series [<xref ref-type="bibr" rid="B44">44</xref>,<xref ref-type="bibr" rid="B45">45</xref>]. The most common manifestations reported are delirium, psychosis and depression, with some authors suggesting that 40% of acute porphyrias present with delirium and hallucinations [<xref ref-type="bibr" rid="B46">46</xref>].</p><p>Some cases are spectacular. For example, Santosh and Malhotra reported the case of a 13- year-old boy with six episodes of psychosis with various presentations, including delusions, hallucinations, hypomania and catatonia, but with no obvious organic signs [<xref ref-type="bibr" rid="B43">43</xref>]. Crimlisk described three noteworthy cases. The first was that of a 53-year-old woman with a history of cognitive decline since the age of 20, and episodes of visual hallucinations, ataxia, abdominal pain and weight loss; diagnosis was achieved after an acute vomiting episode at 53 years of age. A 52-year-old woman with a history of episodic psychiatric disturbance with associated ideas of reference, auditory hallucinations, emotional lability and abdominal pain was also described, with episodes tending to occur pre-menstrually. The third case was a young boy with a history of generalized pain, vesicular rash, fever and nausea, in whom a diagnosis was made when psychiatric symptoms (paranoid schizophrenia) appeared.</p><p>Finally, Mandoki and Summer reported a sub-acute psychiatric dysphoric presentation with emotional lability and aggression, as well as headaches and abdominal pain, in a 9-year-old girl who had a history of aggressive behavior and early anorexia [<xref ref-type="bibr" rid="B47">47</xref>]. The patient was diagnosed with coproporphyria – a subtype of porphyria in which psychiatric signs (labile mood and psychosis) have occasionally been described among affected children and young adults [<xref ref-type="bibr" rid="B47">47</xref>-<xref ref-type="bibr" rid="B51">51</xref>].</p></sec></sec><sec><title>Wilson disease (WD)</title><sec><title>Key features</title><p>WD is an autosomal recessive disorder with a prevalence of 6 per 100 000 of the general population [<xref ref-type="bibr" rid="B39">39</xref>]. A mutation in the <italic>ATP7B</italic> gene coding for a key copper transport protein leads to copper accumulation in the liver, brain, kidney and skeletal system, caused by reduced excretion in the bile [<xref ref-type="bibr" rid="B52">52</xref>].</p><p>In approximately half of patients, computerized tomography reveals characteristic hypodensities in the basal ganglia [<xref ref-type="bibr" rid="B53">53</xref>]. Virtually all patients show magnetic resonance imaging (MRI) abnormalities, including T2-weighted hyperintensities in the thalamus, brainstem and lenticular nuclei [<xref ref-type="bibr" rid="B54">54</xref>]. Functional imaging generally shows significant hypometabolism in the lenticular nuclei [<xref ref-type="bibr" rid="B55">55</xref>].</p><p>Classically, symptoms of WD appear between the ages of 6 and 20 years. Approximately one-third of patients initially present with hepatic disease, one-third with neurological symptoms, and one-third with psychiatric symptomatology. Kayser-Fleischer ring is seen in some patients during ophthalmological examinations. Between one- and two-thirds of patients report psychiatric symptoms at initial presentation [<xref ref-type="bibr" rid="B56">56</xref>-<xref ref-type="bibr" rid="B58">58</xref>]. Psychiatric signs are present in almost 50% of patients at any one time [<xref ref-type="bibr" rid="B59">59</xref>], and present before motor signs in 20% of cases; up to half of patients may be seen initially by a psychiatrist [<xref ref-type="bibr" rid="B60">60</xref>].</p></sec><sec><title>Psychiatric signs</title><p>Eleven relevant case reports or case series (psychiatric or general including psychiatric patients) were identified, and data from most of these were included in a large review [<xref ref-type="bibr" rid="B57">57</xref>]. Four main psychiatric symptom clusters have been identified: mood and affective change; behavior and personality change; psychosis and; cognitive impairment [<xref ref-type="bibr" rid="B61">61</xref>]. Personality changes are very common, particularly irritability and aggression [<xref ref-type="bibr" rid="B56">56</xref>,<xref ref-type="bibr" rid="B62">62</xref>]. Mood disturbance, including both depression and mania, is the most common formal neuropsychiatric illness [<xref ref-type="bibr" rid="B63">63</xref>-<xref ref-type="bibr" rid="B67">67</xref>]. Psychosis, delusional states and catatonia, while less frequent in WD, can be extremely disabling [<xref ref-type="bibr" rid="B56">56</xref>,<xref ref-type="bibr" rid="B57">57</xref>,<xref ref-type="bibr" rid="B60">60</xref>,<xref ref-type="bibr" rid="B61">61</xref>,<xref ref-type="bibr" rid="B68">68</xref>]. Schizophrenia-like symptoms were reported to be present in up to 10% of patients [<xref ref-type="bibr" rid="B63">63</xref>], but were less prevalent in one case series (2.4%) [<xref ref-type="bibr" rid="B69">69</xref>]. Whilst delusions in WD have been reported to be uncommon [<xref ref-type="bibr" rid="B60">60</xref>], a number of psychotic presentations meeting criteria for delusional disorder have recently been described [<xref ref-type="bibr" rid="B70">70</xref>-<xref ref-type="bibr" rid="B73">73</xref>].</p><p>Deteriorating academic performance or work function is another key neurological feature of WD. Neurologically symptomatic patients display a range of cognitive difficulties including impairments of executive function, aspects of memory and visuospatial processing [<xref ref-type="bibr" rid="B59">59</xref>,<xref ref-type="bibr" rid="B74">74</xref>,<xref ref-type="bibr" rid="B75">75</xref>]. In contrast, no such deficits are found in neurologically asymptomatic patients [<xref ref-type="bibr" rid="B76">76</xref>]. Lesions within the basal ganglia seem to be of central importance in cognitive change due to their interruption of frontal-subcortical circuits [<xref ref-type="bibr" rid="B76">76</xref>,<xref ref-type="bibr" rid="B77">77</xref>].</p><p>After initiating treatment with chelation therapy, the disease often stabilizes or improves, but disease progression during treatment is more likely for neuropsychiatric symptoms than for hepatic symptoms [<xref ref-type="bibr" rid="B78">78</xref>]. Resolution of neuropsychiatric illness following chelation has been reported [<xref ref-type="bibr" rid="B67">67</xref>,<xref ref-type="bibr" rid="B73">73</xref>,<xref ref-type="bibr" rid="B79">79</xref>,<xref ref-type="bibr" rid="B80">80</xref>].</p><p>The use of neuroleptic medication may be problematic due to the increased risk of movement disorder side effects in the setting of degenerative basal ganglia disease [<xref ref-type="bibr" rid="B81">81</xref>-<xref ref-type="bibr" rid="B84">84</xref>]. However, some reports suggest the relatively safe use of atypical medications such as olanzapine, risperidone, quetiapine and clozapine, which each have a lower propensity to cause movement disorders [<xref ref-type="bibr" rid="B72">72</xref>,<xref ref-type="bibr" rid="B83">83</xref>,<xref ref-type="bibr" rid="B85">85</xref>,<xref ref-type="bibr" rid="B86">86</xref>]. Nevertheless, these agents should be used with caution because of the increased risk of agranulocytosis in the presence of hypersplenism or penicillamine treatment.</p><p>Treatment of mania with mood stabilizers can be difficult because valproate or carbamazepine may be contraindicated in the presence of significant hepatic impairment [<xref ref-type="bibr" rid="B84">84</xref>]. Lithium may also be contraindicated in the presence of renal tubular acidosis [<xref ref-type="bibr" rid="B84">84</xref>], although successful lithium treatment without metabolic compromise has been reported [<xref ref-type="bibr" rid="B86">86</xref>,<xref ref-type="bibr" rid="B87">87</xref>].</p><p>Electroconvulsive therapy (ECT) has been successfully used in cases of catatonia [<xref ref-type="bibr" rid="B88">88</xref>], psychosis [<xref ref-type="bibr" rid="B89">89</xref>] and depression [<xref ref-type="bibr" rid="B90">90</xref>-<xref ref-type="bibr" rid="B92">92</xref>].</p><p>Depression has been reported as responding to both tricyclic antidepressants and selective serotonin reuptake inhibitors [<xref ref-type="bibr" rid="B91">91</xref>-<xref ref-type="bibr" rid="B93">93</xref>], although treatment-resistance to traditional antidepressants has also been described [<xref ref-type="bibr" rid="B91">91</xref>]. A manic switch in response to antidepressant therapy has also been described in one patient [<xref ref-type="bibr" rid="B93">93</xref>].</p></sec></sec><sec><title>Cerebrotendinous xanthomatosis (CTX)</title><sec><title>Key features</title><p>CTX is an autosomal recessive disease of bile acid synthesis. It is caused by mutations in the <italic>CYP27A1</italic> gene, which is localized on the long arm of chromosome 2 and codes for the mitochondrial enzyme, sterol-27-hydroxylase. This enzyme is involved in the synthesis of chenodeoxycholic and cholic acids from cholesterol. The metabolic block resulting from the mutant gene causes a progressive storage of cholesterol and its poorly soluble by-product, cholestanol, which is deposited in many tissues including the brain and tendons [<xref ref-type="bibr" rid="B94">94</xref>]. A recent review found more than 300 patients with CTX reported worldwide, and identified 50 different mutations in the <italic>CYP27A1</italic> gene associated with this disease [<xref ref-type="bibr" rid="B95">95</xref>]. Prevalence is estimated around 2:100 000 [<xref ref-type="bibr" rid="B96">96</xref>].</p><p>Clinical presentations of CTX are quite variable. The initial symptoms typically begin in childhood with non-specific mild mental retardation, juvenile cataract, chronic diarrhea or epilepsy. Progressive neurological deterioration follows in adolescence or adulthood with acute psychiatric signs [<xref ref-type="bibr" rid="B10">10</xref>,<xref ref-type="bibr" rid="B97">97</xref>], progressive spastic paraparesis, cerebellar ataxia, polyneuropathy, epilepsy and cognitive deficits leading to severe handicap or death. These neurological signs can be accompanied by the appearance of tendon xanthomata, which are usually visible at the level of the Achilles’ tendons. An MRI of the brain typically shows a specific pattern with high signals in the dentate nuclei of the cerebellum on T2-weighted sequences [<xref ref-type="bibr" rid="B98">98</xref>].</p><p>Chenodeoxycholic acid is the primary treatment for CTX. This agent blocks the accumulation of cholestanol by replenishing the pool of bile acid in the liver and hepatic circulation, and shuts down the abnormal hepatic bile acid synthesis pathway. Although it is efficient at normalizing circulating levels of cholestanol, and clearly stabilizes disease progression, it does not improve already existing neurological signs. In addition, xanthomata do not decrease in size.</p></sec><sec><title>Psychiatric signs</title><p>Fourteen articles were identified in the systematic literature review [<xref ref-type="bibr" rid="B10">10</xref>,<xref ref-type="bibr" rid="B97">97</xref>]. Psychiatric manifestations in CTX have only been described in sporadic reports and two patient series [<xref ref-type="bibr" rid="B97">97</xref>,<xref ref-type="bibr" rid="B99">99</xref>-<xref ref-type="bibr" rid="B111">111</xref>]. Unfortunately, many of these cases are poorly documented and do not contain a systematic psychiatric evaluation.</p><p>Acute psychotic episodes have been described, but most psychiatric symptoms are non-specific and occur during childhood and/or adolescence [<xref ref-type="bibr" rid="B10">10</xref>,<xref ref-type="bibr" rid="B97">97</xref>]. Hyperactivity is the most common syndrome seen during youth, and is associated with cognitive impairments in speech and comprehension [<xref ref-type="bibr" rid="B112">112</xref>].</p><p>The Dotti et al. series described 11/13 patients (85%) with psychiatric symptoms [Note: please confirm that 11 patients out of the 13 studied had psychiatric symptoms, as queried]: five with behavioural changes, four with psychosis and two with depression [<xref ref-type="bibr" rid="B107">107</xref>], suggesting an over-representation of psychiatric disorders in this population. This contrasts with the documented rarity of psychiatric signs in CTX (around 10%). In the only small series specifically focusing on the psychiatric spectrum of CTX, Berginer et al. reported four patients with disparate psychiatric syndromes, including irritability and personality changes with hypersexuality, atypical psychosis and paranoid delusions, and severe catatonia [<xref ref-type="bibr" rid="B97">97</xref>]. Diagnoses of CTX were made on the basis of pes cavus and Achilles xanthomata in all patients, and caratacts and cognitive impairment in two cases.</p><p>Two siblings were recently described with an early psychiatric presentation comprising attention deficit hyperactivity disorder (ADHD) and oppositional defiant disorder (ODD) associated with mild intellectual disability [<xref ref-type="bibr" rid="B112">112</xref>]. In both patients, treatment with chenodeoxycholic acid improved externalizing symptoms, and a partial recovery of cognitive impairment was observed.</p></sec></sec><sec><title>Niemann Pick disease type C (NP-C)</title><sec><title>Key features</title><p>NP-C is a pan-ethnic, autosomal recessive neurodegenerative disease with an incidence estimated between 1 case per 150 000 and 1 case per 120 000 live births [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B114">114</xref>]. The disease is characterized by a variety of progressive, disabling neurological symptoms including clumsiness, limb and gait ataxia, dysarthria, dysphagia and cognitive deterioration [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B115">115</xref>].</p><p>NP-C is associated with mutations of the <italic>NPC1</italic> and <italic>NPC2</italic> genes, with no primary defect in catabolic enzymes. <italic>NPC1</italic> gene mutations are present in 95% of cases and <italic>NPC2</italic> mutations are present in approximately 4%. At the cellular level, these mutations give rise to characteristic abnormalities in the intracellular transport of cholesterol, glycosphingolipids and sphingosine. Impaired function of the <italic>NPC1</italic> and <italic>NPC2</italic> gene products, which normally function cooperatively in intracellular lipid transport, leads to the accumulation of these lipids in the late-endosomal/lysosomal intracellular compartment, and excess build up in various tissues. Unesterified cholesterol, sphingomyelin, bis(monoacylglycero)-phosphate, glycosphingolipids and sphingosine are stored in excess in the liver and spleen, while levels of glucosylceramide, lactosylceramide and, above all, GM2 and GM3 gangliosides are markedly increased in the brain [<xref ref-type="bibr" rid="B116">116</xref>].</p><p>NP-C has an extremely heterogeneous clinical presentation characterized by a wide range of symptoms that are not specific to the disease, and which arise and progress over varied periods of time [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B117">117</xref>]. This complicates diagnosis, and is likely an important factor in the under-detection of the NP-C and, in some cases, its misdiagnosis. In the first decade of life, the most common presentations are neurological, although early-onset patients are often diagnosed based on isolated systemic manifestations (e.g. neonatal jaundice, splenomegaly). Many cases are also diagnosed in adulthood, sometimes even up to the seventh decade of life [<xref ref-type="bibr" rid="B118">118</xref>].</p><p>The age at onset of neurological symptoms has a major influence on disease progression; [<xref ref-type="bibr" rid="B119">119</xref>] if neurological symptoms arise early in life the rate of deterioration is generally faster and premature death occurs sooner. Patients with the perinatal-onset form present during the first 3 months of life with an enlarged liver and spleen, prolonged cholestasis, hydrops fetalis and/or respiratory failure [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B114">114</xref>], usually without presenting neurological signs. Infantile, juvenile and adolescent/adult forms usually present with neurological signs including progressive ataxia, dystonia, dysarthria, dysphagia, deafness, cataplexy or, more rarely, epilepsy. Most notably, vertical supranuclear gaze palsy (VSGP) – particularly paresis of downgaze – is a highly specific and highly prevalent sign that may be present at an early stage of the disease [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B115">115</xref>]. VSGP or discrete slowing of saccades is present in almost all cases at some point during the disease course.</p><p>Diagnosis of NP-C requires a skin biopsy and a fibroblast culture in a specialized center, with the resulting cultured cells stained with filipin (which binds excess cholesterol) and tested for cholesterol esterification. However, data suggest that plasma oxysterol measurements may represent a simpler screening and/or diagnostic method in the coming years [<xref ref-type="bibr" rid="B120">120</xref>].</p><p>Therapy for NP-C has, until recently, been limited to supportive measures, including pharmacotherapy to alleviate neurological and psychiatric symptoms [<xref ref-type="bibr" rid="B113">113</xref>,<xref ref-type="bibr" rid="B115">115</xref>,<xref ref-type="bibr" rid="B121">121</xref>]. Miglustat, an iminosugar compound that reversibly inhibits glucosyl ceramide synthetase and thus inhibits the formation of excess gangliosides, is a substrate-reduction therapy that has been shown to stabilize neurological manifestations in children and adults [<xref ref-type="bibr" rid="B122">122</xref>-<xref ref-type="bibr" rid="B124">124</xref>].</p></sec><sec><title>Psychiatric signs</title><p>Numerous cases of NP-C presenting with schizophrenia-like symptoms have been reported in adolescent and adult patients, and nine case series and reports were identified and included in this literature analysis [<xref ref-type="bibr" rid="B125">125</xref>-<xref ref-type="bibr" rid="B133">133</xref>]. Definitive diagnoses are commonly delayed in patients with adult psychiatric presentations of NP-C, sometimes by up to 10 years [<xref ref-type="bibr" rid="B134">134</xref>].</p><p>Psychotic presentations among children and adolescents with NP-C have been reported, and may be comorbid with a pervasive developmental disorder (PDD). Sandu et al. reported a case of an 8-year-old with PDD who presented with auditory hallucinations and 7 years later developed a typical paranoid schizophrenic illness that was partially responsive to risperidone [<xref ref-type="bibr" rid="B132">132</xref>]. One notable report described two siblings with psychosis [<xref ref-type="bibr" rid="B131">131</xref>]. The male sibling presented at 16 years old with visual and auditory hallucinations, and later developed dysarthria and ataxia leading to a definitive diagnosis at the age of 24 years when vertical supranuclear ophthalmoplegia was discovered. His sister developed schizophrenia-like symptoms a decade later, but diagnosis was made rapidly when she was examined for vertical supranuclear ophthalmoplegia based on the family history. Notably, her later onset and lower antipsychotic dosage required to effect symptom resolution mirrored the gender dimorphism seen in typical schizophrenia, which raises the possibility of a gender effect in presentation and progression of NP-C [<xref ref-type="bibr" rid="B131">131</xref>].</p><p>The onset of developmental delay is commonly seen between 6 and 15 years of age in NP-C, and may result in a learning disorder and/or impaired school performance [<xref ref-type="bibr" rid="B117">117</xref>,<xref ref-type="bibr" rid="B135">135</xref>,<xref ref-type="bibr" rid="B136">136</xref>]. Patients commonly display cognitive impairments involving logical thinking and abstraction, impaired attentional processes, poor working memory, word retrieval difficulties, and a lack of interpersonal ‘distance’ [<xref ref-type="bibr" rid="B121">121</xref>,<xref ref-type="bibr" rid="B136">136</xref>]. The typical cognitive profile in adult patients is one of significant executive dysfunction and impaired working memory [<xref ref-type="bibr" rid="B115">115</xref>,<xref ref-type="bibr" rid="B136">136</xref>].</p></sec></sec></sec><sec sec-type="discussion"><title>Discussion</title><p>This article is the first systematic review in this field. Widely unknown and neglected by psychiatrists, IEMs represent a growing field in research that interfaces with clinical psychiatry due to the fact that a number of disorders may initially present to psychiatrists. New treatments are available for a number of these diseases [<xref ref-type="bibr" rid="B137">137</xref>].</p><p>One key finding of this literature review is that the clinical signs of IEMs are poorly documented in terms of both quantity (only 63 articles with original data for seven different disorders) and quality (non-systematic clinical evaluations, lack of standardized clinical scales, sparse clinical description). A second clear finding is that many cases of WD, MTHFR-D and NP-C are strongly associated with psychotic illness.</p><p>It is not realistic, and probably unnecessary due to the rarity of the association, to consider IEMs in all psychiatric patients. It is also not feasible to train psychiatrists to become metabolic specialists. However, it is crucial for all professionals working in psychiatry to be aware of the large variety of organic disorders that may be associated with psychiatric diseases, particularly treatable IEMs such as those addressed in this review, and to be aware of clinical features that may herald an underpinning organic disorder for the patient’s psychiatric presentation.</p><p><bold>One major difficulty</bold> in considering the association of IEMs with psychosis is in ascribing causality. If prevalence rates across a number of populations are higher than 0.8–1.0% (the general population prevalence for schizophrenia) [<xref ref-type="bibr" rid="B138">138</xref>,<xref ref-type="bibr" rid="B139">139</xref>] it may be difficult to consider an association with IEMs as significant as their prevalence is more likely around 1 in 10 000. In addition, when treatment of an organic disorder leads to an improvement in psychotic symptoms, this association is strengthened, and the Bradford-Hill criteria of strength, consistency and temporality are met [<xref ref-type="bibr" rid="B140">140</xref>]. These associations may also aid in shedding light on the potential neurobiological origins of schizophrenia. There is a wide consensus regarding the neurodevelopmental hypothesis of schizophrenia [<xref ref-type="bibr" rid="B141">141</xref>,<xref ref-type="bibr" rid="B142">142</xref>], as well as the role of complex genetic determinism and gene–environment interactions [<xref ref-type="bibr" rid="B143">143</xref>]. The historical association of a range of organic disorders with schizophrenia-like psychosis has shed light on the role that the medial temporal lobe and diencephalon play in the origin of psychotic symptoms [<xref ref-type="bibr" rid="B2">2</xref>], and similarly the recent advancement in our understanding of the neurobiology of various IEMs has shed light on the role of anatomical disconnection and disruption to a range of neurotransmitter systems in the genesis of psychotic illness [<xref ref-type="bibr" rid="B130">130</xref>].</p><p><bold>The second major difficulty</bold> is to recognize IEMs and to think about an organic etiology in clinical practice. In order to help psychiatrists, it could be clinically useful to identify psychiatric features that may trigger for the search of organic disorder in patients with schizophrenia. Unfortunately, data regarding organic psychosis and its specific associated symptoms are scarce. One study, which was not specific for IEMs, analyzed the phenomenology of 74 patients with ‘organic schizophrenia’ compared with ‘non-organic schizophrenia’ [<xref ref-type="bibr" rid="B144">144</xref>]. Visual hallucinations and confusion were seen more often among patients with organic schizophrenia, and comparable features have been observed in elderly schizophrenia patients [<xref ref-type="bibr" rid="B145">145</xref>,<xref ref-type="bibr" rid="B146">146</xref>]. A handful of inborn errors of metabolism may cause elementary hallucination and visual hallucinations which are associated with various organic and psychiatric conditions [<xref ref-type="bibr" rid="B147">147</xref>]. Hallucinations are a core symptom of schizophrenia and are more often auditory or at least, auditory hallucinations are more important than visual hallucinations. We suggest therefore that predominant visual hallucinations are highly suggestive of organic disorders such as IEM. An acute onset of psychiatric symptoms may also raise suspicion of IEMs (e.g. UCDs, porphyria or homocysteinemia with CbS-D). It is also notable that data indicate a high degree of association of catatonia with organic disorders, especially if it occurs during childhood or adolescence [<xref ref-type="bibr" rid="B148">148</xref>]. An unusually high proportion of patients with organic disorders has been reported in large series of patients with early-onset schizophrenia, which suggests that an early-onset of schizophrenia-like symptoms is another indicator for possible organic origin of disease, especially if associated with progressive cognitive decline, which is a common feature in IEMs [<xref ref-type="bibr" rid="B149">149</xref>]. Finally, treatment resistance is frequently associated with IEMs [<xref ref-type="bibr" rid="B150">150</xref>], again suggesting its possible use as an indicator for possible organic disease. In summary, we may suggest six readily recognizable features that should trigger the suspicion of organicity associated with schizophrenia-like symptoms: 1) acute confusion; 2) visual hallucinations more important than auditory hallucinations; 3) catatonia; 4) progressive cognitive decline; 5) early or acute onset and; 6) treatment resistance (see Table <xref ref-type="table" rid="T1">1</xref>). As the validity and specificity of these atypical psychiatric signs have not yet been evaluated, they are presented to raise awareness and suggest clinical and neurological exams prior to further progressive screening. Both atypical psychiatric signs and main clinical/biomarker features of IEM lead us to propose an algorithm (see Figure <xref ref-type="fig" rid="F2">2</xref>). This algorithm is based on clinical practice of OB, HK and MW and DC. We plan to study his validity and reliance in further study in population of patients with psychiatric signs and IEM. Further research is needed to develop a real suspicion index from our group of atypical psychiatric signs associated with this algorithm.</p><table-wrap position="float" id="T1"><label>Table 1</label><caption><p>Atypical psychiatric features which should trigger a search for inborn error of metabolism in patients with schizophrenia</p></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="left"></col></colgroup><thead valign="top"><tr><th align="left"><bold>First level atypical feature (atypical on their own)</bold></th><th align="left"><bold>Second level atypical features (atypical when associated with first level)</bold></th></tr></thead><tbody valign="top"><tr><td align="left" valign="bottom">Confusion<hr></hr></td><td align="left" valign="bottom">Acute onset<hr></hr></td></tr><tr><td align="left" valign="bottom">Visual hallucinations more important than auditory hallucinations<hr></hr></td><td align="left" valign="bottom">Early onset<hr></hr></td></tr><tr><td align="left" valign="bottom">Catatonia<hr></hr></td><td align="left" valign="bottom">Intellectual Disability<hr></hr></td></tr><tr><td align="left" valign="bottom">Progressive cognitive decline<hr></hr></td><td align="left" valign="bottom">Unusual or severe side effects<hr></hr></td></tr><tr><td align="left" valign="bottom">Treatment resistance<hr></hr></td><td align="left" valign="bottom"> <hr></hr></td></tr><tr><td align="left">Fluctuating schizophrenia core symptoms</td><td align="left"> </td></tr></tbody></table><table-wrap-foot><p>As the validity and specificity of these atypical psychiatric signs have not yet been validated, they are presented to rise suspicion and suggest clinical and neurological exam prior to further progressive screening.</p></table-wrap-foot></table-wrap><fig id="F2" position="float"><label>Figure 2</label><caption><p><bold>Diagnostic algorithm for diagnosing inborn errors of metabolism in patients with schizophrenia-like symptoms.</bold> Negative: If exams are negative and suspicion is high. Positive: Could lead to diagnoses or high suspicion of specific disease. MRI = magnetic resonance imaging; MTHFR-CbS = methylenetetrahydrofolate reductase-cystathionine beta-synthase; NP-C = Niemann-Pick disease type C; UCDs = urea cycle disorders, WD = Wilson disease.</p></caption><graphic xlink:href="1750-1172-9-65-2"></graphic></fig><p>Biological screening is not recommended for all patients but only in case of high suspicion. It is also important to know that the cost of screening for most of these disorders in standard metabolic reference laboratories is usually modest, generally consisting of serum or urine tests for various metabolites, comparable or less than the cost of basic neuroimaging. The costs of treating these IEMs varies widely; from B-vitamin replacement and/or dietary modification in a number of disorders, to more expensive long-term treatments in disorders such as NPC, and potential high-cost hospitalizations during metabolic crises in UCDs and porphyria. This should however be referenced against the cost of treating true schizophrenia, at a cost of at least $USD 50000 per year [<xref ref-type="bibr" rid="B151">151</xref>], with at least one third of this borne in direct treatment.</p><p>Toward atypical psychiatric signs, IEMs presents specificities and Table <xref ref-type="table" rid="T2">2</xref> provides a summary that encompasses the main clinical signs of six treatable IEMs, and highlights the main clinical symptoms, biomarkers and context as well as ophthalmologic signs, which occur in at least four of the treatable IEMs.</p><table-wrap position="float" id="T2"><label>Table 2</label><caption><p>Synthesis of main clinical, contextual, ophthalmologic symptoms associated with 7 treatable IEM associated with schizophrenia-like symptoms</p></caption><table frame="hsides" rules="groups" border="1"><colgroup><col align="left"></col><col align="left"></col><col align="center"></col><col align="left"></col><col align="left"></col></colgroup><thead valign="top"><tr><th align="left"><bold>Disorder</bold></th><th align="left"><bold>Clinical signs</bold></th><th align="center"><bold>Context</bold></th><th align="left"><bold>Eye exam</bold></th><th align="left"><bold>Biomarkers</bold></th></tr></thead><tbody valign="top"><tr><td rowspan="3" align="left" valign="bottom"><bold>Wilson disease (WD)</bold><hr></hr></td><td align="left" valign="bottom">Tremor<hr></hr></td><td rowspan="3" align="center" valign="bottom">–<hr></hr></td><td rowspan="3" align="left" valign="bottom">Kayser-Fleischer ring<hr></hr></td><td rowspan="3" align="left" valign="bottom">Ceruloplasmin<hr></hr></td></tr><tr><td align="left" valign="bottom">Dystonia<hr></hr></td></tr><tr><td align="left" valign="bottom">Dysarthria<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom"><bold>Urea cycle disorders (UCDs)</bold><hr></hr></td><td align="left" valign="bottom">Confusion<hr></hr></td><td align="center" valign="bottom">Protein diet<hr></hr></td><td rowspan="3" align="left" valign="bottom">–<hr></hr></td><td rowspan="3" align="left" valign="bottom">Hyperammoniemia<hr></hr></td></tr><tr><td align="left" valign="bottom">Abdominal pain<hr></hr></td><td align="center" valign="bottom">Post surgery<hr></hr></td></tr><tr><td align="left" valign="bottom">Nausea/vomiting<hr></hr></td><td align="center" valign="bottom">Drugs*<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom"><bold>Homocysteinemia (MTHFR)</bold><hr></hr></td><td align="left" valign="bottom">Ataxia<hr></hr></td><td align="center" valign="bottom">–<hr></hr></td><td align="left" valign="bottom">–<hr></hr></td><td align="left" valign="bottom">Homocysteinemia<hr></hr></td></tr><tr><td align="left" valign="bottom">Mental regression<hr></hr></td><td align="center" valign="bottom"> <hr></hr></td><td align="left" valign="bottom"> <hr></hr></td><td align="left" valign="bottom">Methioninemia<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom"><bold>Homocysteinemia (CbS)</bold><hr></hr></td><td align="left" valign="bottom">Thromboembolism<hr></hr></td><td align="center" valign="bottom">Protein diet<hr></hr></td><td align="left" valign="bottom">Severe myopia<hr></hr></td><td align="left" valign="bottom">Homocysteinemia<hr></hr></td></tr><tr><td align="left" valign="bottom">Scoliosis<hr></hr></td><td rowspan="2" align="center" valign="bottom">Post surgery<hr></hr></td><td rowspan="2" align="left" valign="bottom">Ectopic lens<hr></hr></td><td rowspan="2" align="left" valign="bottom">Methioninemia<hr></hr></td></tr><tr><td align="left" valign="bottom">Marfan-like cerebellar signs<hr></hr></td></tr><tr><td rowspan="3" align="left" valign="bottom"><bold>Niemann-Pick disease type C (NP-C)</bold><hr></hr></td><td align="left" valign="bottom">Dystonia + ataxia Dysarthria<hr></hr></td><td align="center" valign="bottom">Neonatal icterus<hr></hr></td><td align="left" valign="bottom">Supranuclear vertical<hr></hr></td><td align="left" valign="bottom">Skin biopsy<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom">Splenomegaly<hr></hr></td><td rowspan="2" align="center" valign="bottom">Slow progression<hr></hr></td><td rowspan="2" align="left" valign="bottom">gaze palsy<hr></hr></td><td align="left" valign="bottom">Filipin test<hr></hr></td></tr><tr><td align="left" valign="bottom"><italic>NPC1</italic> and <italic>NPC2</italic> gene test<hr></hr></td></tr><tr><td rowspan="2" align="left" valign="bottom"><bold>Cerebrotendinous xanthomatosis (CTX)</bold><hr></hr></td><td align="left" valign="bottom">Chronic diarrhea<hr></hr></td><td rowspan="2" align="center" valign="bottom">–<hr></hr></td><td rowspan="2" align="left" valign="bottom">Juvenile cataract<hr></hr></td><td rowspan="2" align="left" valign="bottom">High cholestanol<hr></hr></td></tr><tr><td align="left" valign="bottom">Spastic paralysis<hr></hr></td></tr><tr><td rowspan="5" align="left"><bold>Porphyria (POR)</bold></td><td align="left" valign="bottom">Black or red urine<hr></hr></td><td rowspan="5" align="center">Periodic</td><td rowspan="5" align="left">–</td><td rowspan="5" align="left">Porphobilinogens (URINE)</td></tr><tr><td align="left" valign="bottom">Constipation<hr></hr></td></tr><tr><td align="left" valign="bottom">Confusion<hr></hr></td></tr><tr><td align="left" valign="bottom">Abdominal pain<hr></hr></td></tr><tr><td align="left">Nausea/vomiting</td></tr></tbody></table><table-wrap-foot><p>*Example drugs: valproate/corticoids.</p></table-wrap-foot></table-wrap><p>It is important for psychiatrists and other associated professionals to be specifically aware of potential IEMs when patients present with such indicators (organic signs and atypical psychiatric symptoms) of possible organic psychosis.</p></sec><sec sec-type="conclusions"><title>Conclusions</title><p>Based on published evidence this review highlights the role of a range of IEMs as possible underlying organic causes of schizophrenia or schizophrenia-like syndromes. It is important to identify such cases as some IEMs are treatable (sometimes simply with vitamin replacement or supplementation) and new treatments continue to appear. Clinical studies suggest that some IEM-specific treatments may be most effective during the early stages of disease when psychiatric symptoms may be evident. Efficient recognition and identification of the underlying organic disease could therefore allow earlier initiation of specific therapy and, possibly, improve outcomes.Although the literature base from which to draw conclusions is limited, clinicians managing patients presenting with new-onset psychosis should pay particular attention to IEMs as a possible underlying cause in patients with atypical symptoms, and in the presence of specific clinical contexts. It is hoped that this review summarizing six easily assessed features that might trigger suspicion of organicity in patients with psychosis will help to detect patients with treatable IEMs as early as possible during their disease course. While not intended to replace specialized psychiatric or neurological examination and measurements, our proposed algorithm (Figure <xref ref-type="fig" rid="F2">2</xref>) is a pragmatic tool that can be used to reduce the risk of mistaken diagnoses among patients with atypical psychiatric signs and treatable IEMs.</p></sec><sec><title>Competing interest</title><p>OB, MW, FS and HK declare past and present honorarium from Actelion Pharma. DC and ST have no competing interest.</p></sec><sec><title>Authors’ contribution</title><p>OB write the first draft of the article which was reviewed by all authors. ST, DC, MW and HK help OB for response to reviewers. Regarding specific systematic review work, two groups worked separately in screening abstracts from relevant articles from the literature review (Group 1: MW and HK. Group 2: OB, DC, ST and FS). 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