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Genetic regulation of serum IgA levels and susceptibility to common immune, infectious, kidney, and cardio-metabolic traits.


ABSTRACT: Immunoglobulin A (IgA) mediates mucosal responses to food antigens and the intestinal microbiome and is involved in susceptibility to mucosal pathogens, celiac disease, inflammatory bowel disease, and IgA nephropathy. We performed a genome-wide association study of serum IgA levels in 41,263 individuals of diverse ancestries and identified 20 genome-wide significant loci, including 9 known and 11 novel loci. Co-localization analyses with expression QTLs prioritized candidate genes for 14 of 20 significant loci. Most loci encoded genes that produced immune defects and IgA abnormalities when genetically manipulated in mice. We also observed positive genetic correlations of serum IgA levels with IgA nephropathy, type 2 diabetes, and body mass index, and negative correlations with celiac disease, inflammatory bowel disease, and several infections. Mendelian randomization supported elevated serum IgA as a causal factor in IgA nephropathy. African ancestry was consistently associated with higher serum IgA levels and greater frequency of IgA-increasing alleles compared to other ancestries. Our findings provide novel insights into the genetic regulation of IgA levels and its potential role in human disease.

SUBMITTER: Liu L 

PROVIDER: S-EPMC9651905 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Genetic regulation of serum IgA levels and susceptibility to common immune, infectious, kidney, and cardio-metabolic traits.

Liu Lili L   Khan Atlas A   Sanchez-Rodriguez Elena E   Zanoni Francesca F   Li Yifu Y   Steers Nicholas N   Balderes Olivia O   Zhang Junying J   Krithivasan Priya P   LeDesma Robert A RA   Fischman Clara C   Hebbring Scott J SJ   Harley John B JB   Moncrieffe Halima H   Kottyan Leah C LC   Namjou-Khales Bahram B   Walunas Theresa L TL   Knevel Rachel R   Raychaudhuri Soumya S   Karlson Elizabeth W EW   Denny Joshua C JC   Stanaway Ian B IB   Crosslin David D   Rauen Thomas T   Floege Jürgen J   Eitner Frank F   Moldoveanu Zina Z   Reily Colin C   Knoppova Barbora B   Hall Stacy S   Sheff Justin T JT   Julian Bruce A BA   Wyatt Robert J RJ   Suzuki Hitoshi H   Xie Jingyuan J   Chen Nan N   Zhou Xujie X   Zhang Hong H   Hammarström Lennart L   Viktorin Alexander A   Magnusson Patrik K E PKE   Shang Ning N   Hripcsak George G   Weng Chunhua C   Rundek Tatjana T   Elkind Mitchell S V MSV   Oelsner Elizabeth C EC   Barr R Graham RG   Ionita-Laza Iuliana I   Novak Jan J   Gharavi Ali G AG   Kiryluk Krzysztof K  

Nature communications 20221111 1


Immunoglobulin A (IgA) mediates mucosal responses to food antigens and the intestinal microbiome and is involved in susceptibility to mucosal pathogens, celiac disease, inflammatory bowel disease, and IgA nephropathy. We performed a genome-wide association study of serum IgA levels in 41,263 individuals of diverse ancestries and identified 20 genome-wide significant loci, including 9 known and 11 novel loci. Co-localization analyses with expression QTLs prioritized candidate genes for 14 of 20 s  ...[more]

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