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RISS 인기검색어
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- 저자 : Namjou, B. (검색결과 3 건)
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Evaluation of <i>TRAF6</i> in a large multiancestral lupus cohort
Namjou, Bahram,Choi, Chan‐,Bum,Harley, Isaac T. W.,Alarcó,n‐,Riquelme, Marta E.,Kelly, Jennifer A.,Glenn, Stuart B.,Ojwang, Joshua O.,Adler, Adam,Kim, Kwangwoo,Gallant, Caroline J.,B Wiley Subscription Services, Inc., A Wiley Company 2012 Vol.64 No.6
<P><B>Abstract</B></P><P><B>Objective</B></P><P>Systemic lupus erythematosus (SLE) is a heterogeneous autoimmune disease with significant immune system aberrations resulting from complex heritable genetics as well as environmental factors. We undertook to study the role of <I>TRAF6</I> as a candidate gene for SLE, since it plays a major role in several signaling pathways that are important for immunity and organ development.</P><P><B>Methods</B></P><P>Fifteen single‐nucleotide polymorphisms (SNPs) across <I>TRAF6</I> were evaluated in 7,490 SLE patients and 6,780 control subjects from different ancestries. Population‐based case–control association analyses and meta‐analyses were performed. <I>P</I> values, false discovery rate q values, and odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated.</P><P><B>Results</B></P><P>Evidence of associations was detected in multiple SNPs. The best overall <I>P</I> values were obtained for SNPs rs5030437 and rs4755453 (<I>P</I> = 7.85 × 10<SUP>−5</SUP> and <I>P</I> = 4.73 × 10<SUP>−5</SUP>, respectively) without significant heterogeneity among populations (<I>P</I> = 0.67 and <I>P</I> = 0.50, respectively, in Q statistic). In addition, SNP rs540386, which was previously reported to be associated with rheumatoid arthritis (RA), was found to be in linkage disequilibrium with these 2 SNPs (r<SUP>2</SUP> = 0.95) and demonstrated evidence of association with SLE in the same direction (meta‐analysis <I>P</I> = 9.15 × 10<SUP>−4</SUP>, OR 0.89 [95% CI 0.83–0.95]). The presence of thrombocytopenia improved the overall results in different populations (meta‐analysis <I>P</I> = 1.99 × 10<SUP>−6</SUP>, OR 0.57 [95% CI 0.45–0.72], for rs5030470). Finally, evidence of family‐based association in 34 African American pedigrees with the presence of thrombocytopenia was detected in 1 available SNP (rs5030437) with a Z score magnitude of 2.28 (<I>P</I> = 0.02) under a dominant model.</P><P><B>Conclusion</B></P><P>Our data indicate the presence of association of <I>TRAF6</I> with SLE, consistent with the previous report of association with RA. These data provide further support for the involvement of <I>TRAF6</I> in the pathogenesis of autoimmunity.</P>
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Interferon-gamma gene polymorphisms associated with susceptibility to systemic lupus erythematosus.
Kim, Kwangwoo,Cho, Soo-Kyung,Sestak, Andrea,Namjou, Bahram,Kang, Changwon,Bae, Sang-Cheol British Medical Association 2010 Annals of the Rheumatic Diseases Vol.69 No.6
<P>Interferon-gamma (IFNG) is a type II interferon playing diverse roles in innate and adaptive immune systems. Elevated expression of IFNG has been associated with systemic lupus erythematosus (SLE). This study examined the association of IFNG polymorphisms with SLE susceptibility.</P>
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Lupus Risk Variant Increases pSTAT1 Binding and Decreases ETS1 Expression
Lu, X.,Zoller, Erin E.,Weirauch, Matthew T.,Wu, Z.,Namjou, B.,Williams, Adrienne H.,Ziegler, Julie T.,Comeau, Mary E.,Marion, Miranda C.,Glenn, Stuart B.,Adler, A.,Shen, N.,Nath, Swapan K.,Stevens, An University of Chicago Press [etc.] 2015 American journal of human genetics Vol.96 No.5
Genetic variants at chromosomal region 11q23.3, near the gene ETS1, have been associated with systemic lupus erythematosus (SLE), or lupus, in independent cohorts of Asian ancestry. Several recent studies have implicated ETS1 as a critical driver of immune cell function and differentiation, and mice deficient in ETS1 develop an SLE-like autoimmunity. We performed a fine-mapping study of 14,551 subjects from multi-ancestral cohorts by starting with genotyped variants and imputing to all common variants spanning ETS1. By constructing genetic models via frequentist and Bayesian association methods, we identified 16 variants that are statistically likely to be causal. We functionally assessed each of these variants on the basis of their likelihood of affecting transcription factor binding, miRNA binding, or chromatin state. Of the four variants that we experimentally examined, only rs6590330 differentially binds lysate from B cells. Using mass spectrometry, we found more binding of the transcription factor signal transducer and activator of transcription 1 (STAT1) to DNA near the risk allele of rs6590330 than near the non-risk allele. Immunoblot analysis and chromatin immunoprecipitation of pSTAT1 in B cells heterozygous for rs6590330 confirmed that the risk allele increased binding to the active form of STAT1. Analysis with expression quantitative trait loci indicated that the risk allele of rs6590330 is associated with decreased ETS1 expression in Han Chinese, but not other ancestral cohorts. We propose a model in which the risk allele of rs6590330 is associated with decreased ETS1 expression and increases SLE risk by enhancing the binding of pSTAT1.
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