Article

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

Prenatal Diagnosis Center, Affiliated Drumtower Hospital, School of Medicine, Nanjing University, Nanjing 210008, China.
Zhonghua yi xue za zhi 07/2009; 89(25):1753-6. DOI: 10.3760/cma.j.issn.0376-2491.2009.25.009
Source: PubMed

ABSTRACT

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.
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.
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.
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;

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    ABSTRACT: To detect potential mutations for probands from families affected with Duchenne/Becker muscular dystrophy (DMD/BMD), and to carry out prenatal diagnosis through identification of female carriers. A total of 43 DMD/BMD families were recruited. Multiplex PCR was used to analyze 18 exons within hotspots for DMD gene deletions. Multiplex ligation-dependent probe amplification (MLPA) was used to detect potential deletions and duplications of DMD gene for 43 patients and 36 females from 32 families. Prenatal diagnosis was performed for 27 families. Deletional mutations were detected in 26 patients with multiplex PCR. In addition, MLPA has detected 3 deletions and 6 duplicational mutations, and the ranges of mutations were all determined. Among 36 female members, 18 were determined as carriers of deletional mutations, 10 were excluded as mutation carriers. The status of remaining 8 could not be determined. For prenatal diagnosis, 3 out of 18 male fetuses were diagnosed as patients and 1 female fetus was identified as carrier. MLPA is an accurate and reliable method for detecting deletional/duplicational mutations of DMD gene as well as for prenatal diagnosis and detection of female carriers.
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