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Updated: Oct 5, 2025

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
Published on: October 18, 2013
DMD exon 2 duplication due to a complex genomic rearrangement is associated with a somatic mosaicism
Akatsuki Kubota1, Hiroyuki Ishiura1, Kristine Joyce Linay Porto2
1Department of Neurology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
Abstract:
We report the case of a patient with dystrophinopathy caused by DMD exon 2 duplication, showing marked asymmetric muscle atrophy. Immunostaining of the biopsied muscle tissue showed a mosaic staining, suggesting a somatic mosaicism. Polymerase chain reaction (PCR) analysis showed only one breakpoint, and long-read whole-genome sequencing revealed the entire structure of the rearranged sequence. The complex rearrangement was composed of two tandem duplications: one showed a microhomology near the breakpoint, suggesting a microhomology-mediated mechanism, whereas the other was associated with flanking short tandem repeats. The long-read sequencing also suggested the presence of a wild-type nonduplicated sequence, supporting somatic mosaicism. Whereas complementary DNA and western blot analyses were not useful, droplet digital PCR (ddPCR) analysis showed an average copy number of 1.61, enabling accurate estimation of the proportion of cells containing the duplication. Long-read sequencing and ddPCR analysis were useful for revealing the rearrangements and the precise copy number.
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