原发免疫性血小板减少症患者 PT PN22基因多态性研究

目的：探讨原发免疫性血小板减少症（ITP）患者蛋白酪氨酸磷酸酶非受体型22（PTPN22）基因 rs2476601、rs3811021和 rs2488457共3个位点的基因多态性。方法收集贵阳医学院附属白云医院和贵阳医学院附属医院血液科共100例 ITP 患者（ITP 组）和100例健康体检人群（对照组）的外周血，聚合酶链反应-限制性片段长度多态性（PCR-RFLP）检测 PT-PN22基因＋1858位点（rs2476601）和3′UTR 区 rs3811021位点，序列特异性引物聚合酶链反应（PCR-SSP）检测启动子-1123位点（rs2488457）的单核苷酸多态性，并对结果进行统计学分析。结果 ITP 患者与对照组 PTPN22基因＋1858位点均为 C 等位基因，未检测到 T 等位基因，无单核苷酸多态性（R620W）存在。 PTPN22基因 rs3811021位点 TT 、CT 、CC 共3个基因型在 ITP患者中的频率与对照组比较差异无统计学意义（χ2＝3．686，P＝0．158）。 T 等位基因、C 等位基因在两组人群中的频率比较差异无统计学意义（χ2＝2．828，P＝0．093）。 PTPN22基因-1123位点（rs2488457）GG 、GC 、CC 3种基因型在 ITP 中的频率与对照组比较差异无统计学意义（χ2＝1．802，P ＝0．406）。 C 等位基因和 G 等位基因在两组人群中的频率比较差异无统计学意义（χ2＝0．003，P＝0．954）。按性别因素分别比较 ITP 患者与对照者 rs3811021和 rs2488457两个 SNP 位点的基因型及等位基因频率，证实 ITP 组和对照组女性人群中3种基因型及等位基因频率比较差异无统计学意义（P＜0．05），两组男性患者比较差异无统计学意义（P＜0．05）。结论中国贵州汉族人群不存在 PTPN22基因 rs2476601的单核苷多态性；存在 rs3811021和 rs2488457位点的单核苷多态性，但无性别差异，且与 ITP 的发病无显著相关性。

The research of single-nucleotide polymorphisms in the PTPN22 gene conferring the susceptibility in immune thrombocytopenia

Objective To investigate the single-nucleotide polymorphisms of PTPN22 gene rs2476601 ,rs3811021 and rs2488457 in patients with primary immune thrombocytopenia(ITP) .Methods Totally 100 patients with ITP and 100 cases as con-trol from Department of Hematology ,the Affiliated Baiyun Hospital of Guiyang Medical College and the Affiliated Hospital of Guiyang Medical College were collected .PTPN22 gene + 1858 loci (rs2476601) and 3′UTR region rs3811021 loci were detected by PCR-RFLP ,the promoter-1123 loci (rs2488457) were detected by PCR-SSP ,and the results were statistically analyzed .Results PTPN22 gene + 1858 locus in ITP patients and control group were all C allele ,T allele was detected ,and there was no single nucle-otide polymorphisms (R620W) exist .The frequency of PTPN22 gene rs3811021 locus TT ,CT ,CC three genotypes in ITP patients and control group had no significant difference(χ2 = 3 .686 ,P= 0 .158) .The frequency of T allele ,C allele in ITP patients and con-trol group had no significant difference(χ2 = 2 .828 ,P = 0 .093) .The frequency of PTPN22-1123 gene (rs2488457)GG ,GC ,CC three genotypes in ITP patients and control group had no significant difference(χ2 = 1 .802 ,P = 0 .406) .The frequency of C allele and G allele in ITP patients and control group had no significant difference(χ2 = 0 .003 ,P = 0 .954) .According to the gender fac-tors ,in females ,the genotype and allele frequency of SNP loci rs3811021 and rs2488457 in ITP patients and control group had no significant difference(P< 0 .05) ,so as in males(P < 0 .05) .Conclusion PTPN22 gene rs2476601 this SNP site does not exist in Guizhou Han population ,The addition of two SNP loci of PTPN22 gene (rs3811021 ,rs2488457) exists polymorphism ,but the two SNP loci has no sex difference ,the onset and ITP in Guizhou Han population had no significant correlation .