[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
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