二重二次PCR对外显子缺失型DMD患者单淋巴细胞遗传学诊断的研究

目的 对已知dystrophin基因50号外显子缺失的Duchenne型肌营养不良(Duchenne muscular dystrophy,DMD)患者及正常对照者进行单个淋巴细胞遗传学诊断,建立该病单细胞植入前遗传学诊断(preimplantation genetic diagnosis,PGD)方法,为携带者夫妇进行植入前遗传学诊断以提供细胞学基础.方法 在解剖显微镜下获取已经确诊为dystrophin基因50号外显子缺失型DMD患者和正常对照者的单个淋巴细胞,采用dystrophin基因50号外显子引物/SRY基因引物二重二次PCR的方法进行遗传学诊断.结果 男性患者单个淋巴细胞中SRY基因阳性同时50号外显子阴性的比例为92%;正常男性对照中SRY基因和50号外显子均阳性的比例为91%;正常女性对照中50号外显子阳性和SRY基因阴性的比例为93%.结论 通过二重二次PCR能够进行dystrophin基因50号外显子缺失型DMD患者和正常对照的单个淋巴细胞遗传学诊断,为PGD技术在该病遗传学诊断中的应用打下基础.

Cytogenetic diagnosis on single lymphocyte of DMD patient with exon 50 deletion by two-time duplex PCR

Objective To perform the cytogenetic diagnosis on single lymphocyte of DMD patient with dystrophin gene exon 50 deletion.Methods Single lymphocytes of a DMD patient with dystrophin gene exon 50 deletion and normal volunteers were picked out and prepared for two-time duplex PCR.Results The rate of precise positive was 92%,91% and 93% in specimens of the patient(SRY positive,exon 50 negative),the male volunteer(SRY positive,exon 50 positive)and the female volunteer(SRY negative,exon 50 positive),respectively.Conclusion Two-time duplex PCR is fit for the genetic diagnosis of single lymphocyte from DMD patient with dystrophin gene exon 50 deletion.