La maladie de Parkinson au Canada (serveur d'exploration)

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Hypermethylation of the CpG Island Near the G4C2 Repeat in ALS with a C9orf72 Expansion

Identifieur interne : 000D61 ( Main/Exploration ); précédent : 000D60; suivant : 000D62

Hypermethylation of the CpG Island Near the G4C2 Repeat in ALS with a C9orf72 Expansion

Auteurs : Zhengrui Xi [Canada] ; Lorne Zinman [Canada] ; Danielle Moreno [Canada] ; Jennifer Schymick [Canada] ; Yan Liang [Canada] ; Christine Sato [Canada] ; Yonglan Zheng [États-Unis] ; Mahdi Ghani [Canada] ; Samar Dib [Canada] ; Julia Keith [Canada] ; Janice Robertson [Canada] ; Ekaterina Rogaeva [Canada]

Source :

RBID : PMC:3675239

Abstract

The G4C2 repeat expansion in C9orf72 is the most common known cause of amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). We tested the hypothesis that the repeat expansion causes aberrant CpG methylation near the G4C2 repeat, which could be responsible for the downregulation of gene expression. We investigated the CpG methylation profile by two methods using genomic DNA from the blood of individuals with ALS (37 expansion carriers and 64 noncarriers), normal controls (n = 76), and family members of 7 ALS probands with the expansion. We report that hypermethylation of the CpG island 5′ of the G4C2 repeat is associated with the presence of the expansion (p < 0.0001). A higher degree of methylation was significantly correlated with a shorter disease duration (p < 0.01), associated with familial ALS (p = 0.009) and segregated with the expansion in 7 investigated families. Notably, we did not detect methylation for either normal or intermediate alleles (up to 43 repeats), bringing to question the current cutoff of 30 repeats for pathological alleles. Our study raises several important questions for the future investigation of large data sets, such as whether the degree of methylation corresponds to clinical presentation (ALS versus FTLD).


Url:
DOI: 10.1016/j.ajhg.2013.04.017
PubMed: 23731538
PubMed Central: 3675239


Affiliations:


Links toward previous steps (curation, corpus...)


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<p>The G
<sub>4</sub>
C
<sub>2</sub>
repeat expansion in
<italic>C9orf72</italic>
is the most common known cause of amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD). We tested the hypothesis that the repeat expansion causes aberrant CpG methylation near the G
<sub>4</sub>
C
<sub>2</sub>
repeat, which could be responsible for the downregulation of gene expression. We investigated the CpG methylation profile by two methods using genomic DNA from the blood of individuals with ALS (37 expansion carriers and 64 noncarriers), normal controls (n = 76), and family members of 7 ALS probands with the expansion. We report that hypermethylation of the CpG island 5′ of the G
<sub>4</sub>
C
<sub>2</sub>
repeat is associated with the presence of the expansion (p < 0.0001). A higher degree of methylation was significantly correlated with a shorter disease duration (p < 0.01), associated with familial ALS (p = 0.009) and segregated with the expansion in 7 investigated families. Notably, we did not detect methylation for either normal or intermediate alleles (up to 43 repeats), bringing to question the current cutoff of 30 repeats for pathological alleles. Our study raises several important questions for the future investigation of large data sets, such as whether the degree of methylation corresponds to clinical presentation (ALS versus FTLD).</p>
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<name sortKey="Keith, Julia" sort="Keith, Julia" uniqKey="Keith J" first="Julia" last="Keith">Julia Keith</name>
<name sortKey="Liang, Yan" sort="Liang, Yan" uniqKey="Liang Y" first="Yan" last="Liang">Yan Liang</name>
<name sortKey="Moreno, Danielle" sort="Moreno, Danielle" uniqKey="Moreno D" first="Danielle" last="Moreno">Danielle Moreno</name>
<name sortKey="Robertson, Janice" sort="Robertson, Janice" uniqKey="Robertson J" first="Janice" last="Robertson">Janice Robertson</name>
<name sortKey="Rogaeva, Ekaterina" sort="Rogaeva, Ekaterina" uniqKey="Rogaeva E" first="Ekaterina" last="Rogaeva">Ekaterina Rogaeva</name>
<name sortKey="Rogaeva, Ekaterina" sort="Rogaeva, Ekaterina" uniqKey="Rogaeva E" first="Ekaterina" last="Rogaeva">Ekaterina Rogaeva</name>
<name sortKey="Sato, Christine" sort="Sato, Christine" uniqKey="Sato C" first="Christine" last="Sato">Christine Sato</name>
<name sortKey="Schymick, Jennifer" sort="Schymick, Jennifer" uniqKey="Schymick J" first="Jennifer" last="Schymick">Jennifer Schymick</name>
<name sortKey="Zinman, Lorne" sort="Zinman, Lorne" uniqKey="Zinman L" first="Lorne" last="Zinman">Lorne Zinman</name>
</country>
<country name="États-Unis">
<noRegion>
<name sortKey="Zheng, Yonglan" sort="Zheng, Yonglan" uniqKey="Zheng Y" first="Yonglan" last="Zheng">Yonglan Zheng</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

Pour manipuler ce document sous Unix (Dilib)

EXPLOR_STEP=$WICRI_ROOT/Wicri/Canada/explor/ParkinsonCanadaV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000D61 | SxmlIndent | more

Ou

HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000D61 | SxmlIndent | more

Pour mettre un lien sur cette page dans le réseau Wicri

{{Explor lien
   |wiki=    Wicri/Canada
   |area=    ParkinsonCanadaV1
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     PMC:3675239
   |texte=   Hypermethylation of the CpG Island Near the G4C2 Repeat in ALS with a C9orf72 Expansion
}}

Pour générer des pages wiki

HfdIndexSelect -h $EXPLOR_AREA/Data/Main/Exploration/RBID.i   -Sk "pubmed:23731538" \
       | HfdSelect -Kh $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd   \
       | NlmPubMed2Wicri -a ParkinsonCanadaV1 

Wicri

This area was generated with Dilib version V0.6.29.
Data generation: Thu May 4 22:20:19 2017. Site generation: Fri Dec 23 23:17:26 2022