[Mutation analysis and prenatal diagnosis of sporadic DMD/BMD families].

OBJECTIVE

To analyze the pathogenic mutation of sporadic patients in Duchenne/ Becker muscular dystrophy (DMD/BMD) families and to perform prenatal diagnosis, identify the female carriers and evaluate the ratio of de novo mutation in these pedigrees.

METHODS

A total of 30 sporadic DMD/BMD families were included. Traditional multiplex PCR was used to detect the 18 exons in the deletion hot area of DMD gene. MLPA was used to detect the deletion or duplication mutations of DMD gene for 30 patients and 28 females from 23 families. Prenatal diagnosis was performed in 19 families.

RESULTS

Deletion mutation was detected in 19 patients through mPCR. Twenty-one deletions and 3 duplication mutations were detected by MLPA. Among 21 mothers, 10 mothers were carriers of deletion mutation and two duplication mutation carriers. The other 9 mothers were non-carriers, the mutations in these families were de novo and the ratio was 37.5%. Among seven sisters, five were carriers and two non-carriers. In the prenatal diagnosis families, 2 of 8 female fetuses were carriers and 5 of 12 male fetus patients.

CONCLUSION

The MLPA technique has proved to be an accurate and reliable tool not only for the deletion and duplication mutations of DMD patients, but also for the prenatal diagnosis and the female carriers in these families. Prenatal diagnosis;