多重连接探针扩增方法在假肥大性肌营养不良产前基因诊断中的应用

Prenatal diagnosis of Duchenne and Becker muscular dystrophy by multiplex ligation-dependent probe amplification

假肥大性肌营养不良(Duchenne/Becker muscular dystrophy,DMD/BMD)是一种由于DMD基因突变导致的X连锁隐性致死性遗传病。目前没有有效的治疗方法。为建立一种既可以对携带者进行检测又可以进行产前基因诊断的方法,文章联合应用多重连接探针扩增技术(Multiplex ligation-dependent probe amplification,MLPA)和短串联重复序列(Short tandem repeats,STR)为遗传标记连锁分析的方法对26例有高风险再生育患儿的假肥大性肌营养不良家系的孕妇通过羊水穿刺进行产前基因诊断。26例进行产前基因诊断的羊水标本中有7例诊断为男性患儿,4例诊断为女性携带者。MLPA可以作为筛查DMD基因缺失和重复突变的首选方法。联合应用MLPA和STR连锁分析,可以提高假肥大性肌营养不良的产前基因诊断率。

Duchenne/Becker muscular dystrophy （DMD/BMD） is an X-linked lethal recessive disease caused by mutation in the DMD gene. There is no efficient treatment for this serious and disabling disease. We established a combination method to detect carders and performed prenatal diagnosis. Using multiplex ligation-dependent probe amplification （MLPA） and linkage analysis of short tandem repeats （STR） methods, 26 prenatal diagnosis were performed for pregnancies at risk of having a DMD/BMD baby through amniocentesis. Seven out of 26 male fetuses were affected and the pregnancies were terminated. Four out of 26 female fetuses were found to be carriers. MLPA can be the method of choice for initial screening of DMD/BMD patients for deletions and duplications mutations. When combined with STR-based analysis, it can improve the rate of DMD/BMD prenatal diagnosis.