Article (Scientific journals)
Deleterious mutations in LRBA are associated with a syndrome of immune deficiency and autoimmunity.
Lopez-Herrera, Gabriela; Tampella, Giacomo; Pan-Hammarstrom, Qiang et al.
2012In American Journal of Human Genetics, 90 (6), p. 986-1001
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Keywords :
Adaptor Proteins, Signal Transducing/genetics; Agammaglobulinemia/genetics; Apoptosis; Autoimmunity/genetics; Autophagy; B-Lymphocytes/cytology; Cell Proliferation; Child; Child, Preschool; Chromosome Mapping; Female; Genetic Linkage; Genotype; Homozygote; Humans; Immunologic Deficiency Syndromes/genetics; Immunophenotyping; Male; Microscopy, Electron, Transmission/methods; Models, Genetic; Mutation; Pedigree; Phenotype
Abstract :
[en] Most autosomal genetic causes of childhood-onset hypogammaglobulinemia are currently not well understood. Most affected individuals are simplex cases, but both autosomal-dominant and autosomal-recessive inheritance have been described. We performed genetic linkage analysis in consanguineous families affected by hypogammaglobulinemia. Four consanguineous families with childhood-onset humoral immune deficiency and features of autoimmunity shared genotype evidence for a linkage interval on chromosome 4q. Sequencing of positional candidate genes revealed that in each family, affected individuals had a distinct homozygous mutation in LRBA (lipopolysaccharide responsive beige-like anchor protein). All LRBA mutations segregated with the disease because homozygous individuals showed hypogammaglobulinemia and autoimmunity, whereas heterozygous individuals were healthy. These mutations were absent in healthy controls. Individuals with homozygous LRBA mutations had no LRBA, had disturbed B cell development, defective in vitro B cell activation, plasmablast formation, and immunoglobulin secretion, and had low proliferative responses. We conclude that mutations in LRBA cause an immune deficiency characterized by defects in B cell activation and autophagy and by susceptibility to apoptosis, all of which are associated with a clinical phenotype of hypogammaglobulinemia and autoimmunity.
Disciplines :
General & internal medicine
Genetics & genetic processes
Author, co-author :
Lopez-Herrera, Gabriela
Tampella, Giacomo
Pan-Hammarstrom, Qiang
Herholz, Peer
Trujillo-Vargas, Claudia M.
Phadwal, Kanchan
Simon, Anna Katharina
Moutschen, Michel  ;  Université de Liège - ULiège > Département des sciences cliniques > GIGA-R:Immunopath. - Maladies infect. et médec. inter. gén.
Etzioni, Amos
Mory, Adi
Srugo, Izhak
Melamed, Doron
Hultenby, Kjell
Liu, Chonghai
Baronio, Manuela
Vitali, Massimiliano
Philippet, Pierre
DIDEBERG, Vinciane ;  Centre Hospitalier Universitaire de Liège - CHU > Génétique
Aghamohammadi, Asghar
Rezaei, Nima
Enright, Victoria
Du, Likun
Salzer, Ulrich
Eibel, Hermann
Pfeifer, Dietmar
Veelken, Hendrik
Stauss, Hans
Lougaris, Vassilios
Plebani, Alessandro
Gertz, E. Michael
Schaffer, Alejandro A.
Hammarstrom, Lennart
Grimbacher, Bodo
More authors (23 more) Less
Language :
English
Title :
Deleterious mutations in LRBA are associated with a syndrome of immune deficiency and autoimmunity.
Publication date :
2012
Journal title :
American Journal of Human Genetics
ISSN :
0002-9297
eISSN :
1537-6605
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
90
Issue :
6
Pages :
986-1001
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Copyright (c) 2012 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.
Available on ORBi :
since 23 November 2012

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