The TIM (T cell/transmembrane, immunoglobulin and mucin) proteins are crucial regulators of Th1/Th2 immune responses and have been implicated in several diseases including HIV-1/AIDS. The TIM1 exon 4 that codes for mucin domain is highly diverse, with sequence variants associated with varying phenotypes. In this study, TIM1 exon 4 was sequenced among 227 HIV-1 seroprevalent and 288 healthy non infected individuals from North Indian population and haplotypes established. A novel but rare haplotype D1(∗) was identified among the healthy and differed from D1 by a synonymous substitution G>T at Thr208Thr. The TIM1 haplotype diversity showed no association with susceptibility to HIV-1 infection. The seroprevalent individuals carrying D3A had relatively higher median CD4+T cell counts (368/μl) than those without (313/μl; p=0.02). A comparison of CD4+T counts between D3-A individuals on ART or ART naïve did not show any significant difference plausibly due to confounding nature of ART and other factors.

译文

TIM (T细胞/跨膜,免疫球蛋白和粘蛋白) 蛋白是Th1/Th2免疫反应的关键调节剂,并与包括HIV-1/艾滋病在内的多种疾病有关。编码粘蛋白结构域的TIM1外显子4是高度多样化的,其序列变异与不同的表型相关。在这项研究中,TIM1外显子4在来自北印度人群的227 HIV-1血清阳性和288健康的非感染个体中进行了测序,并建立了单倍型。在健康人群中发现了一种新颖但罕见的单倍型D1(∗),与D1的区别在于Thr208Thr的同义替换G>T。TIM1单倍型多样性与HIV-1感染的易感性无关。携带D3A的血清复价个体的CD4 + T细胞中位数计数 (368/μ l) 相对高于不携带的个体 (313/μ l; p = 0.02)。由于ART的混杂性质和其他因素,对ART或ART天真的D3-A个体之间的CD4 T计数进行比较并未显示出任何显着差异。

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