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Tandem duplication within the DMD gene in Labrador retrievers with a mild clinical phenotype.


ABSTRACT: A form of dystrophinopathy with mild or subclinical neuromuscular signs has been previously reported in a family of Labrador retrievers. Markedly and persistently elevated creatine kinase activity was first noted at 6 months of age. Skeletal muscle biopsies revealed a dystrophic phenotype, with dystrophin non-detectable on western blotting and immunohistochemical staining, and with increased utrophin expression. In this report we demonstrate with western blotting that α-dystroglycan is present at essentially normal levels. Whole genome sequencing has also now revealed an approximately 400kb tandem genomic DNA duplication including exons 2-7 of the DMD gene that was inserted into intron 7 of the wild type gene. Skeletal muscle cDNA from 2 cases contained DMD transcripts as expected from an in-frame properly-spliced exon 2-7 tandem insertion. A similar 5' duplication involving DMD exons 2-7 has been reported in a human family with dilated cardiomyopathy but without skeletal myopathy. This is the 3rd confirmed mutation in the DMD gene in Labrador retrievers.

SUBMITTER: Shelton GD 

PROVIDER: S-EPMC10040250 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Tandem duplication within the DMD gene in Labrador retrievers with a mild clinical phenotype.

Shelton G Diane GD   Minor Katie M KM   Vieira Natassia M NM   Kunkel Louis M LM   Friedenberg Steven G SG   Cullen Jonah N JN   Guo Ling T LT   Zatz Mayana M   Mickelson James R JR  

Neuromuscular disorders : NMD 20220806 10


A form of dystrophinopathy with mild or subclinical neuromuscular signs has been previously reported in a family of Labrador retrievers. Markedly and persistently elevated creatine kinase activity was first noted at 6 months of age. Skeletal muscle biopsies revealed a dystrophic phenotype, with dystrophin non-detectable on western blotting and immunohistochemical staining, and with increased utrophin expression. In this report we demonstrate with western blotting that α-dystroglycan is present a  ...[more]

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