來自重慶醫(yī)科大學(xué)、電子科技大學(xué)等機(jī)構(gòu)的研究人員,通過全基因組關(guān)聯(lián)研究(GWAS)鑒別出了伏格特小柳原田綜合征(Vogt-Koyanagi-Harada syndrome ,VKH)新風(fēng)險(xiǎn)位點(diǎn)。該GWAS研究成果于2014年8月10日已發(fā)表在《Nature Genetics》雜志上。
本文的共同通訊作者是重慶醫(yī)科大學(xué)附屬第一醫(yī)院的楊培增教授和任職于電子科技大學(xué)醫(yī)學(xué)院和四川省人民醫(yī)院的楊正林教授。楊培增教授是衛(wèi)生部突出貢獻(xiàn)專家,其擅長(zhǎng)治療各種頑固葡萄膜炎,如Behcet病、VKH綜合征、交感性眼炎、視網(wǎng)膜血管炎、風(fēng)濕病性葡萄膜炎等。楊正林教授是我國(guó)眼睛疾病基因研究領(lǐng)域的知名專家。
VKH綜合征是一種累及眼部、聽覺系統(tǒng)、腦膜和皮膚的自身免疫性疾病,是繼白塞病之后較常見的全葡萄膜炎。眼部主要表現(xiàn)為脈絡(luò)膜炎,脈絡(luò)膜視網(wǎng)膜炎,視乳頭炎,神經(jīng)視網(wǎng)膜炎和肉芽腫性全葡萄膜炎,常伴有腦膜刺激征,聽覺功能障礙,皮膚和毛發(fā)改變等全身性表現(xiàn);颊叱3霈F(xiàn)頭痛、頭昏、耳鳴,雙眼視力下降,視乳頭、視網(wǎng)膜出現(xiàn)水腫,漿液性視網(wǎng)膜脫離,后期可出現(xiàn)晚霞狀眼底、脫發(fā)與白發(fā)、皮膚白癜等改變。
在本文中,作者通過GWAS研究在中國(guó)漢族人群中系統(tǒng)搜索了VKH綜合征新的易感位點(diǎn)。在初篩階段,研究人員分析了774例VKH綜合征病例以及與之相匹配的2,009例健康對(duì)照的2,208,258個(gè)SNPs。在驗(yàn)證階段,他們進(jìn)一步對(duì)分別包含415例VKH綜合征病例和2,006例健康對(duì)照,以及349例VKH綜合征病例和1,588例健康對(duì)照的兩組人群進(jìn)行了驗(yàn)證。作者由此發(fā)現(xiàn)了與VKH綜合征易感性相關(guān)的3個(gè)位點(diǎn):IL23R-C1orf141(rs117633859, Pcombined = 3.42 × 10−21, odds ratio (OR) = 1.82); ADO-ZNF365-EGR2( rs442309, Pcombined = 2.97 × 10−11, OR = 1.37); 和HLA-DRB1/DQA1( rs3021304, Pcombined = 1.26 × 10−118, OR = 2.97)。這項(xiàng)研究結(jié)果為VKH綜合征的遺傳學(xué)和生物學(xué)提供了更多的見解。
近年來,GWAS技術(shù)的發(fā)展通過成功鑒別新的遺傳易感位點(diǎn),幫助人們更深入地了解成百上千疾病的發(fā)病機(jī)制以往有研究從基因水平證實(shí)日本VKH患者主要與HLA-DRB1*0405密切相關(guān),表明VKH綜合征具有遺傳易感性。目前,研究人員期望利用GWAS技術(shù)鑒別更多新的風(fēng)險(xiǎn)位點(diǎn),以此獲得更多關(guān)于VKH綜合征的新認(rèn)識(shí)。
文章中芯片實(shí)驗(yàn)都在晶能生物完成,并在致謝部分感謝晶能生物。
晶能推薦原文摘要:
Genome-wide association analysis of Vogt-Koyanagi-Harada syndrome identifies two new susceptibility loci at 1p31.2 and 10q21.3
To identify new genetic risk factors for Vogt-Koyanagi-Harada (VKH) syndrome, we conducted a genome-wide association study of 2,208,258 SNPs in 774 cases and 2,009 controls with follow-up in a collection of 415 cases and 2,006 controls and a further collection of 349 cases and 1,588 controls from a Han Chinese population. We identified three loci associated with VKH syndrome susceptibility (IL23R-C1orf141, rs117633859, Pcombined = 3.42 × 10−21, odds ratio (OR) = 1.82;ADO-ZNF365-EGR2, rs442309, Pcombined = 2.97 × 10−11, OR = 1.37; and HLA-DRB1/DQA1, rs3021304, Pcombined = 1.26 × 10−118, OR = 2.97). The five non-HLA genes were all expressed in human iris tissue. IL23R was also expressed in the ciliary body, and EGR2 was expressed in the ciliary body and choroid. The risk G allele of rs117633859 in the promoter region of IL23R exhibited low transcriptional activation in a cell-based reporter assay and was associated with diminishedIL23R mRNA expression in human peripheral blood mononuclear cells.