摘要目的 针对温州地区汉族人群β地中海贫血患者进行β珠蛋白基因的突变分析,寻找温州地区引起该病的主要致病突变位点,为开展温州地区β地中海贫血的遗传咨询、产前诊断和预防计划提供有价值的资料.方法 抽取66例经临床诊断为β地中海贫血患者的静脉血,提取DNA,采用PCR扩增,纯化后直接测序,与标准序列进行Blast分析,并对部分变异采用克隆证实.结果 在收集的66例病例中,经诊断确认44例散发β地中海贫血,经PCR产物直接测序分析发现9种基因变异类型,3种属于中国人常见突变类型(IVS-2-654、CD_(41/42)-TTCT和TATA box nt-28),2种属于少见类型异常血红蛋白(CD_(47)、CD_(66)),2种为新发现变异(-24T→C,CD_(26A)→G同义突变),另外存在2个已知的单核苷酸多态性位点(exon1 59,IVS-2-665).结论 温州地区汉族人群珠蛋白基因突变类型具有一定的特殊性,发现了罕见的变异类型和新的突变位点,该研究为在本地区开展产前诊断和遗传咨询提供了参考借鉴资料.

abstractsObjective To analysis the β-globin gene mutation in β-thalassemia in the population of Wenzhou natives,and identify the major mutation in Wenzhou and further provide valuable information for genetic counseling,prenatal diagnosis and prevention programs in this region.Methods Patients with β-thalassemia were diagnosed and the genomics DNA were extracted from whole blood cells and amplified with PCR,sequenced and compared to the standard sequence.Some mutations were further identified by subcloned.Results 44 of 66 patients were diagnosed β-Thalassemia,9 mutations were found in the 44 sporadic patients with the sequence analysis,2 of which were known polymorphisms(exonl 59,IVS-2-665),3 belonged to the common mutations in Chinese(IVS-2-654,CD_(41/42)-TTCT and TATA box nt-28),2 were scarce abnormalities(CD_(47),CD_(66))and 2 novel variants(-24T→C,CD_(26A)→G,same sense mutation,unreported).Conclusion The mutations of β-globin gene in Han Chinese in Wenzhou are complex (9 mutations found in all),the rare and novel mutations are identified,which provide the valuable information for genetic counseling in Wenzhou.