高分辨熔解曲线技术快速筛查 UGT1 A1基因变异

The establishment of a high resolution melting analysis based rapid screening system for UGT1A1 gene mutation

目的：利用高分辨熔解曲线技术，建立一种快速分子筛查UGT1A1基因缺陷相关的Gilbert （ GS）和Crigler－Najjar综合征（ CNS）的方法。方法方法学建立。临床收集的61例不明原因严重高胆红素血症的新生儿样本以待验证，有明确黄疸原因如ABO溶血，G6PD缺乏，败血症，缺血缺氧性脑病的黄疸儿除外。根据亚洲人群UGT1A1基因常见突变位点－G211A 、C686A、 C1091T、C1352T和T1456G，设计特异性HRM引物，建立和优化HRM反应条件。用优化的HRM方法对临床标本进行UGT1A1基因突变的筛查，所有的样本经测序进一步验证。结果 HRM检测方法能够准确地将有突变的样本与无突变的样本区分开来。经HRM 分子筛查，61例严重黄疸儿中，42例检出携带有UGT1A1突变，共检测出4种UGT1A1突变类型。结论本研究建立的PCR－HRM分型技术可以经济、简便、快速、有效的检测UGT1 A1基因异常，为临床诊断GS及CNS提供可靠的依据，也有利于UGT1A1基因相关疾病的大规模的分子流行病学研究。（中华检验医学杂志，2017，40：101－104）

Objective To develop a high-resolution melting （ HRM ） assay for rapidly screening Gilbert syndrome （ GS） and Crigler-Najjar syndrome （ CNS） associated with UGT1A1 defects.Method Methodology was developed .Then, we applied the established method to analyze 61 clinical samples from neonatal patients with severe unexplained unconjugated hyperbilirubinemia .Neonates with known risk factors for developing hyperbilirubinemia , such as ABO hemolysis, G6PD deficiency, sepsis, hypoxic ischemic encephalopathy were excluded .Five pairs of PCR primers were designed to detect the five common mutations （G211A, C686A, C1091T, C1352T and T1456G） in Asia population.PCR and HRM Assay conditions were optimized.UGT1A1 genotyping in clinical samples was performed by using the established HRM analysis , and all results were subsequently confirmed by direct DNA sequencing .Results The mutants were readily differentiated by using HRM analysis .In this study, 42 neonates were identified with UGT1A1 mutation, and 4 different known variants were detected .Conclusion HRM analysis in this study was economical, convenient, rapid, effective for screening UGT1A1 gene mutations, which can serve as an reliable method for the clinical diagnosis of GS and CNS and the large-scale molecular epidemiological research of UGT1A1 gene-related diseases.