广西黑衣壮族高胆红素血症新生儿UGT1A1基因突变分析

Mutations in UGT1A1 gene in neonates with hyperbilirubinemia of Guangxi Heiyi Zhuang nationality

目的探讨广西黑衣壮族高胆红素血症新生儿尿苷二磷酸葡萄糖醛酸转移酶1A1(UGT1A1)基因的突变分布特点及其与高胆红素血症的关系。方法提取黑衣壮族高胆红素血症新生儿(病例组)及对照组新生儿血液基因组DNA各100例,对UGT1A1启动子TATA盒及所有外显子进行PCR扩增及直接测序。结果检测到UGT1A1启动子TATA盒(TA)7插入突变、第1外显子G71R错义突变及第5外显子中4个SNP位点(rs199539868、rs114982090、rs1042640、rs8330)。病例组的G71R等位基因频率显著高于对照组(P<0.01);两组TATA盒、rs1042640及rs8330位点基因型分布和等位基因频率差异均无统计学意义(P>0.05)。Logistic回归分析显示UGT1A1 TATA盒、G71R、rs1042640及rs8330对新生儿高胆红素血症发生的OR值(95%CI)分别为0.846(0.440,1629)、3.932(1.745,8.858)、0.899(0.364,2.222)。结论 UGT1A1基因(TA)7插入突变与G71R错义突变是广西黑衣壮族高胆红素血症新生儿的常见突变类型,4个SNP位点(rs199539868、rs114982090、rs1042640、rs8330)为国内首次报道。UGT1A1 G71R错义突变是广西黑衣壮族新生儿高胆红素血症的危险因素。

Objective To study the distribution of mutations of UDP-glucuronosyltransferase 1A1 （UGT1A1） gene and its relationship with hyperbilirubinemia among neonates with hyperbilirubinemia of Guangxi Heiyi Zhuang nationality. Methods Total genomic DNA was extracted from the blood of 100 neonates with hyperbilirubinemia （case group） and 100 neonates without hyperbilirubinemia （control group）, all of whom were selected from Guangxi Heiyi Zhuang population. TATA box and all exons of UGT1A1 gene were amplified by PCR and directly sequenced. Results （TA）7 insertion mutation in TATA box, G71R missense mutation in exon 1, and 4 single nucleotide polymorphisms （SNPs） （rs199539868, rs114982090, rs1042640 and rs8330） in exon 5 were observed. The allele frequency of G71R mutation in the case group was significantly higher than that in the control group（P〈0.01）. There were no significant differences in the genotype distribution and allele frequency of TATA box mutation and SNPs （rs1042640 and rs8330） between the two groups （P〉0.05）. The logistic regression analysis showed that the odds ratios （95% confidence intervals） of UGT1A1 TATA box mutation, G71R mutation, and SNPs （rs1042640 and rs8330） associated with the development of neonatal hyperbilirubinemia were 0.846 （0.440, 1.629）, 3.932 （1.745, 8.858）, 0.899 （0.364, 2.222）, respectively. Conclusions （TA）7 insertion mutation and G71R missense mutation of UGT1A1 gene are common mutation types in neonates with hyperbilirubinemia of Guangxi Heiyi Zhuang nationality. Four SNPs （rs199539868, rs114982090, rs1042640, and rs8330） was first reported in China. UGT1A1 G71R missense mutation is a risk factor for hyperbilirubinemia in neonates of Guangxi Heiyi Zhuang nationality.