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Molecular cloning of Brugia malayi antigens for diagnosis of lymphatic filariasis.

Identifieur interne : 00D172 ( Main/Merge ); précédent : 00D171; suivant : 00D173

Molecular cloning of Brugia malayi antigens for diagnosis of lymphatic filariasis.

Auteurs : R. Chandrashekar [États-Unis] ; K C Curtis ; R M Ramzy ; F. Liftis ; B W Li ; G J Weil

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RBID : pubmed:7935604

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Abstract

Immunological crossreactivity among nematodes has hampered development of specific serodiagnostic assays for lymphatic filariasis. In the present study, we report the molecular cloning and characterization of two filaria-specific recombinant clones (BmM5 and BmM14) with immunodiagnostic potential. BmM5 is a 505-bp cDNA which codes for a protein of 130 residues that ends with an endoplasmic reticulum targeting sequence. BmM14 is closely related to a recently reported clone (SXP-1), and it has 62% homology (deduced amino acid sequence) with a previously described Onchocerca volvulus clone, lambda RAL-2. Glutathione S-transferase fusion proteins of BmM5 and BmM14 were tested in various ELISA formats. The best results were obtained by measuring IgG4 antibodies to the fusion proteins. ELISA studies showed that approximately 90% of 111 sera from Indian and Egyptian patients with brugian and bancroftian filariasis were reactive with both antigens. Nonendemic sera as well as sera from patients with schistosomiasis or intestinal helminths were uniformly nonreactive. Assays based on BmM5 and BmM14 may be useful for large scale screening as an alternative to microfilaria or filarial antigen detection as a means of obtaining a rough index of filariasis endemicity in previously unstudied areas.

PubMed: 7935604

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Le document en format XML

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<nlm:affiliation>Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110.</nlm:affiliation>
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<wicri:cityArea>Department of Medicine, Washington University School of Medicine, St. Louis</wicri:cityArea>
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<name sortKey="Ramzy, R M" sort="Ramzy, R M" uniqKey="Ramzy R" first="R M" last="Ramzy">R M Ramzy</name>
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<term>Amino Acid Sequence</term>
<term>Animals</term>
<term>Antibodies, Helminth (blood)</term>
<term>Antigens, Helminth (genetics)</term>
<term>Brugia malayi (genetics)</term>
<term>Brugia malayi (immunology)</term>
<term>Cloning, Molecular</term>
<term>DNA, Helminth (genetics)</term>
<term>Elephantiasis, Filarial (diagnosis)</term>
<term>Elephantiasis, Filarial (immunology)</term>
<term>Enzyme-Linked Immunosorbent Assay (statistics & numerical data)</term>
<term>Genetic Vectors</term>
<term>Helminth Proteins (genetics)</term>
<term>Helminth Proteins (immunology)</term>
<term>Humans</term>
<term>Immunoglobulin G (blood)</term>
<term>Immunoglobulin G (classification)</term>
<term>Immunologic Tests</term>
<term>Molecular Sequence Data</term>
<term>Sensitivity and Specificity</term>
<term>Sequence Homology, Amino Acid</term>
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<term>ADN des helminthes (génétique)</term>
<term>Animaux</term>
<term>Anticorps antihelminthe (sang)</term>
<term>Antigènes d'helminthe (génétique)</term>
<term>Brugia malayi (génétique)</term>
<term>Brugia malayi (immunologie)</term>
<term>Clonage moléculaire</term>
<term>Données de séquences moléculaires</term>
<term>Filariose lymphatique (diagnostic)</term>
<term>Filariose lymphatique (immunologie)</term>
<term>Humains</term>
<term>Immunoglobuline G ()</term>
<term>Immunoglobuline G (sang)</term>
<term>Protéines d'helminthes (génétique)</term>
<term>Protéines d'helminthes (immunologie)</term>
<term>Sensibilité et spécificité</term>
<term>Similitude de séquences d'acides aminés</term>
<term>Séquence d'acides aminés</term>
<term>Test ELISA ()</term>
<term>Tests immunologiques</term>
<term>Vecteurs génétiques</term>
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<term>Antibodies, Helminth</term>
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<term>Antigens, Helminth</term>
<term>DNA, Helminth</term>
<term>Helminth Proteins</term>
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<term>Elephantiasis, Filarial</term>
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<keywords scheme="MESH" qualifier="diagnostic" xml:lang="fr">
<term>Filariose lymphatique</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Brugia malayi</term>
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<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>ADN des helminthes</term>
<term>Antigènes d'helminthe</term>
<term>Brugia malayi</term>
<term>Protéines d'helminthes</term>
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<keywords scheme="MESH" qualifier="immunologie" xml:lang="fr">
<term>Brugia malayi</term>
<term>Filariose lymphatique</term>
<term>Protéines d'helminthes</term>
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<term>Brugia malayi</term>
<term>Elephantiasis, Filarial</term>
<term>Helminth Proteins</term>
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<keywords scheme="MESH" qualifier="sang" xml:lang="fr">
<term>Anticorps antihelminthe</term>
<term>Immunoglobuline G</term>
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<term>Enzyme-Linked Immunosorbent Assay</term>
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<keywords scheme="MESH" xml:lang="en">
<term>Amino Acid Sequence</term>
<term>Animals</term>
<term>Cloning, Molecular</term>
<term>Genetic Vectors</term>
<term>Humans</term>
<term>Immunologic Tests</term>
<term>Molecular Sequence Data</term>
<term>Sensitivity and Specificity</term>
<term>Sequence Homology, Amino Acid</term>
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<term>Animaux</term>
<term>Clonage moléculaire</term>
<term>Données de séquences moléculaires</term>
<term>Humains</term>
<term>Immunoglobuline G</term>
<term>Sensibilité et spécificité</term>
<term>Similitude de séquences d'acides aminés</term>
<term>Séquence d'acides aminés</term>
<term>Test ELISA</term>
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<div type="abstract" xml:lang="en">Immunological crossreactivity among nematodes has hampered development of specific serodiagnostic assays for lymphatic filariasis. In the present study, we report the molecular cloning and characterization of two filaria-specific recombinant clones (BmM5 and BmM14) with immunodiagnostic potential. BmM5 is a 505-bp cDNA which codes for a protein of 130 residues that ends with an endoplasmic reticulum targeting sequence. BmM14 is closely related to a recently reported clone (SXP-1), and it has 62% homology (deduced amino acid sequence) with a previously described Onchocerca volvulus clone, lambda RAL-2. Glutathione S-transferase fusion proteins of BmM5 and BmM14 were tested in various ELISA formats. The best results were obtained by measuring IgG4 antibodies to the fusion proteins. ELISA studies showed that approximately 90% of 111 sera from Indian and Egyptian patients with brugian and bancroftian filariasis were reactive with both antigens. Nonendemic sera as well as sera from patients with schistosomiasis or intestinal helminths were uniformly nonreactive. Assays based on BmM5 and BmM14 may be useful for large scale screening as an alternative to microfilaria or filarial antigen detection as a means of obtaining a rough index of filariasis endemicity in previously unstudied areas.</div>
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