一种新的8kb缺失α地贫基因的鉴定.PDFVIP

J South Med Univ, 2017, 37(7): 997-1000 doi 10.3969/j.issn. 1673-4254.2017.07.26 ·997 · 临床研究 一一种新的种新的33..88 kbkb 缺失缺失αα地贫基因的鉴定地贫基因的鉴定 黄革，郑有为，王景健，吴 际，刘胜男 广东省人民医院//广东省医学科学院病理医学部检验科，广东广州 510080 摘要：目的首次报道一种新的3.8 kb 缺失α地贫基因，利用gap-PCR 技术建立该缺失片段检测方法。方法 采集先证者及其母 亲外周血，进行血液学参数常规地贫基因检测，对常规基因检测结果存在疑问标本重新设计新gap-PCR 引物及体系以测试发现 证实新的缺失α地贫基因类型。结果 先证者检出新的α珠蛋白基因缺失，缺失片段大小为3814 bp ，确认先证者α地贫基因型 4.2 3.8 3.8 为-α /-α ，其母亲基因型为αα/-α 。结论 本研究首例报告了一种新发现的3.8 kb 缺失α地贫基因，丰富了世界地中海贫血突变 基因数据库，特异性gap-PCR 的建立为该类型地贫基因检出提供方便、有效的检测手段。 关键词：α地中海贫血；基因缺失；跨越断裂点PCR ；首报 Identification of a new 3.8kb deletional α thalassemia and detection of the deletion fragment HUANG Ge, ZHENG Youwei, WANG Jingjian, WU Ji, LIU Shengnan Department of Clinical Laboratory, Guangdong General Hospital//Guangdong Academy of Medical Sciences, Guangzhou 510080, China Abstract: Objective To report the identification of a novel 3.8-kb deletion that caused αthalassemia and establish the method for detecting the deletion fragment. Methods Peripheral blood samples were collected from the proband and his mother for analysis of the hematological parameters and routine test for thalassemia genes. For the sample with an inconsistency between the genotyping results and phenotypic analysis results, a specific gap-PCR was employed to identify the rare or novel mutations. Results A novel 3814-bp deletion causing α thalassemia was found in the proband and his mother, who had genotypes of -α4.2 3.8 3.8 /-α and αα/-α , respectively. Conclusion We identified a 3.8-kb deletion in the α-globin gene cluster that caused α thalassemia, and this finding enriches the α thalassemia gene mutation spectrum. Specific gap-PCR offers a convenient and efficient means for for detecting this deletion fragment. Keywords: alpha thalassemia ；DNA deletion; gap-PCR 地中海贫血是最常见的人类单基因遗传