泰国缺失型α地中海贫血1的产前基因诊断

目的对携带泰国缺失型α地中海贫血1,可能生育α地中海贫血高危胎儿的夫妇进行产前基因诊断。方法应用聚合酶链反应、DNA测序等方法对夫妇及胎儿DNA进行基因分析。结果4个家系的孕妇均为泰国缺失型α地中海贫血1复合α地中海贫血2的Hb H病患者,5个家系的孕妇或丈夫为泰国缺失型α地中海贫血1杂合子;其配偶为东南亚缺失型α地中海贫血1杂合子。他们的胎儿检出2例Hb Bart’s胎儿水肿综合征,1例Hb H病,4例α地中海贫血杂合子,2名正常。DNA测序分析证实PCR的检测结果。结论泰国缺失型α地中海贫血1的产前基因诊断研究,对遗传咨询和地中海贫血产前基因诊断具有重要意义。

Prenatal diagnosis of Thailand deletion of α-thalassemia 1

OBJECTIVE: To conduct prenatal diagnosis on the couples carrying Thailand deletion (--THAI) alpha-thalassemia 1 and at high risk of having fetus with alpha-thalassemia. METHODS: Genotypes of couples and fetuses were analyzed by PCR and DNA sequencing. RESULTS: Four pregnant women were patients with Hb H diseases of --THAI compounding with alpha-thalassemia 2, while their husbands were heterozygote of the Southeast Asian type alpha-thalassemia 1 (--SEA). Another 5 families, either husbands or wives were heterozygote of --THAI or --SEA. The genotypes of their fetuses were as follows: 2 cases with Hb Bart's hydrops fetalis syndrome, 1 Hb H disease, 4 alpha-thalassemia heterozygote and 2 normal. The DNA sequencing approved the PCR results. CONCLUSION: The study on prenatal diagnosis of Thailand deletion alpha-thalassemia 1 is of importance to the genetic counseling and prenatal diagnosis of alpha-thalassemia.