基因测序在β地中海贫血稀有突变患者产前诊断中的应用(1)
http://www.100md.com
2010年3月5日
 |
| 第1页 |
参见附件(2068KB，3页)。
[摘要] 目的:应用直接基因测序为β地中海贫血稀有突变患者进行产前基因诊断。方法:产前行常规血液学筛查,对怀疑β地中海贫血的患者行反向点杂交检测常见的17种突变,对未发现突变的患者采用直接基因测序,确证是否携带β地中海贫血稀有突变,对同时携带稀有β地中海贫血基因突变的夫妇取孕妇脐血或行羊水产前基因诊断。结果:为两对携带稀有β地中海贫血基因突变的夫妇行产前基因诊断,其中一对夫妇的丈夫为CD41-42(-TTCT)杂合突变,孕妇为CD6(GAG→AAG)/N杂合突变,胎儿羊水为CD6(GAG→AAG)/N杂合突变;第二对夫妇的丈夫为CD22(GAA→GCA)/N杂合突变,孕妇为CD56(GGC→GAC)/N杂合突变,胎儿脐血未发现突变。结论:联合反向点杂交和直接基因测序技术可为携带稀有β地中海贫血基因突变的夫妇提供产前基因诊断。
[关键词] 地中海贫血;产前诊断;稀有突变;CD6;CD56;CD22
[中图分类号] R596.2 [文献标识码]A [文章编号]1674-4721(2010)03(a)-015-03
Prenatal diagnosis for the rare beta-thalassemia mutation carriers with DNA sequencing
SONG Chunlin*,FAN Juhua,CHEN Shufen,GUO Xiaoling
(Clinical Laboratory of Foshan Maternal and Children′s Healthcare Hospital of Foshan,Foshan528000,China)
[Abstract] Objective: Prenatal diagnosis was performed for the rare beta-thalassemia mutation carriers by direct DNA sequencing of the entire β-globin gene. Methods: Screened the couples by cell counter and hemoglobin analysis, then identified the commonest known 17 types mutation by reverse blot dot. For the doubtful patient who was not detected mutation,direct DNA sequencing of the entire β-globin gene. Prenatal diagnosis was performed for the couples who was identified as rare beta-thalassemia mutation carriers. Results: One pregnant was heterozygote of CD6(GAG→AAG)/N and her husband was heterozygote of CD41-42(-TTCT),her fetus was heterozygote of CD6(GAG→AAG)/N.The other pregnant was CD56 (GGC→GAC)/N heterozygote of and her husband was heterozygote of CD22(GAA→GCA)/N,her fetus was not detected any reported mutation. Conclusion: Direct DNA sequencing of the entire β-globin gene is a effective technology of prenatal diagnosis for the rare beta-thalassemia mutation carriers.
[Key words] Thalassemia; Prenatal diagnosis; Rare mutation; CD6; CD56; CD22
地中海贫血是我国南方最常见和危害最大的单基因遗传病之一,重型β地中海贫血一般在出生后3～6个月出现症状,需要靠频繁地输血和去铁治疗维持生命,多在成年前夭折。目前主要以聚合酶链反应结合反向点杂交芯片技术检测中国人常见的17种β地中海贫血突变。还有一部分患者携带稀有β地中海贫血突变,若其配偶也携带β地中海贫血突变,容易被忽略,有可能诞生中重度β地中海贫血的患儿。笔者利用直接基因测序方法,发现一些稀有β地中海贫血突变患者,并为两对双方均携带β地中海贫血的夫妇做了产前诊断。
1 资料与方法
1.1 一般资料
来本院产前诊断的孕妇及其丈夫,筛查并基因测序确诊两对夫妇(A夫妇和B夫妇)携带稀有β地中海贫血突变,两对夫妇自愿要求行产前基因诊断 ......
您现在查看是摘要介绍页，详见PDF附件(2068KB，3页)。