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Article Abstract
Background: Primary ciliary dyskinesia (PCD) is a rare genetic disease caused by defects in various genes affecting ciliary function. It is currently unclear why DRC1 gene variants are a relatively frequent cause of disease in Japanese and Korean patients.
Methods: A 12-year-old Japanese girl with bronchiectasis was suspected of PCD and examined using whole-exome sequencing (WES). The breakpoint region was confirmed by Sanger sequencing and evaluation of transposable elements.
Results: Whole-exome sequencing revealed a deletion of DRC1 exons 1-4 in the patient, followed by validation with Sanger sequencing. A DRC1 exon 1-4 deletion is recurrently observed in Japanese and Korean patients with PCD. All reported patients carry the same breakpoint region, which shows signs of Alu-mediated recombination. Intriguingly, common haplotypes were observed around the DRC1 gene in Japanese and Korean patients.
Conclusion: The recurrent DRC1 exon 1-4 deletion is therefore likely to be a founder variant and should be considered a major genetic cause of PCD in Japanese and Korean patients with PCD.
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