6号染色体上可能存在银屑病易感基因

Evidence for Psoriasis susceptibility Locus in China:Locus on Chromosome 6p21.3

目的研究中国人寻常型银屑病与6p21.3区域内的六个微卫星标记和4q上的两个微卫星标记是否连锁,以寻找银屑病易感基因位点。方法利用选取的微卫星位点作为标记,采用微卫星荧光标记-基因扫描及分型技术,选取205例经确诊并符合寻常型银屑病诊断标准的患者,对其中14个银屑病家系进行连锁分析。结果在研究的家系中未发现4q上的微卫星标记与银屑病易感基因之间的连锁,而在染色体6p21.3区域存在着与之有连锁关系的微卫星标记位点(在D6S273位点上两点分析最大LOD值为1.26)。结论本研究表明在中国人银屑病患者中,染色体6p21.3区域可能存在银屑病易感基因。

Objective To elucidate the genetic base of psoriasis for Chinese patients, the positional candidate loci (D6S273?D6S276?D6S422?D6S299?D6S291?D4S1535?D4S1652?D4S171)previously reported in the regions 6p21.3 and 4q were studied in some carefully examined psoriatic families in order to establish whether the eight reported microsatellites loci(STRs) underlay susceptibility to psoriasis in different populations. Methods Two hundred and five probands with psoriasis vulgaris were identified from outpatients attending the Institute of Dermatology, Chinese Academy of Medical Sciences. Genotypes were generated at 8 polymorphic loci on chromosome 6p21 and 4q in 14 pedigrees. The results were analyzed parametrically by linkage 5.0 software. Results There was evidence for linkage to D6S273 in 6p21.3 (the LOD score was 1.26) . No evidence for linkage was obtained at other loci including three loci on chromosome 4q. Conclusions This study confirms the presence of a psoriasis susceptibility locus on chromosome 6p previously studied. It is shown that there may be psoriasis susceptibility locus D6S273 on chromosome 6p21.3 in the Chinese population.