Multiplex Ligation-Dependent Probe Amplification in X-linked Recessive Muscular Dystrophy in Korean Subjects.
OBJECTIVE
Duchenne muscular dystrophy (DMD) and Becker muscular dystrophy (BMD) are similar genetic disorders whose patterns of mutation and disease phenotypes might be expected to show differences among different countries. We analyzed multiplex ligation-dependent probe amplification (MLPA) data in a large number of Korean patients with DMD/BMD.


METHODS
We obtained 130 positive MLPA results (86 DMD, 27 BMD, and 17 female carriers) from 272 candidates (237 clinically suspected patients and 35 possible female carriers) who took part in this study. We analyzed the mutation patterns among 113 patients diagnosed by MLPA and calculated deletion/duplication percentages from a total of 128 patients, including 15 patients who were diagnosed using methods other than MLPA. We also analyzed hot spot locations among the 130 MLPA-positive results.


RESULTS
Most mutations were detected in a central hot spot region between exons 44 and 55 (80 samples, 60.6%). Unlike previous reports, a second frequently observed hot spot near the 5'-end was not distinctive. MLPA detected deletions in specific exons in 92 patients with DMD/BMD (71.8%) and duplications in 21 patients (16.4%).


CONCLUSIONS
Our MLPA study of a large number of Korean patients with DMD/BMD identified the most frequent mutation hot spot, as well as a unique hot spot pattern. DMD gene mutation patterns do not appear to show significant ethnic differences.
Department of Rehabilitation Medicine, Gangnam Severance Hospital and Rehabilitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea.
Mi Ri
MR
Suh
Department of Laboratory Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
Kyung A
KA
Lee
Department of Rehabilitation Medicine, Gangnam Severance Hospital and Rehabilitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea.
Eun Young
EY
Kim
Department of Rehabilitation Medicine, Gangnam Severance Hospital and Rehabilitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea.
Jiho
J
Jung
Department of Rehabilitation Medicine, Gangnam Severance Hospital and Rehabilitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea.
Won Ah
WA
Choi
Department of Rehabilitation Medicine, Gangnam Severance Hospital and Rehabilitation Institute of Neuromuscular Disease, Yonsei University College of Medicine, Seoul, Korea. kswoong@yuhs.ac.
Seong Woong
SW
Kang
D000293:Adolescent; D000328:Adult; D044466:Asian People / Q000235:genetics; D002648:Child; D004252:DNA Mutational Analysis / Q000379:methods*; D016189:Dystrophin / Q000235:genetics*; D005091:Exons / Q000235:genetics; D005260:Female; D017353:Gene Deletion; D006579:Heterozygote; D006801:Humans; D008297:Male; D008403:Mass Screening; D060885:Multiplex Polymerase Chain Reaction / Q000379:methods*; D020388:Muscular Dystrophy, Duchenne / Q000175:diagnosis* / Q000208:ethnology / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D056910:Republic of Korea; D012189:Retrospective Studies; D017422:Sequence Analysis, DNA; D017384:Sequence Deletion; D055815:Young Adult
D016189:Dystrophin
Becker muscular dystrophy; Duchenne muscular dystrophy; female carrier; multiple ligation-dependent probe amplification