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Prevalence and founder effect of DRC1 exon 1–4 deletion in Korean patients with primary ciliary dyskinesia

Abstract

Primary ciliary dyskinesia (PCD) is a genetically heterogeneous disorder affecting ciliary structure and function. PCD exhibiting dynein regulatory complex subunit 1 (DRC1) exon 1–4 deletion has been reported in several Japanese PCD patients; however, no large scale studies have been performed. Here, we aimed to determine the prevalence and founder effect of this variant in the Korean population. Using an in-house copy number variation tool, we screened for DRC1 exon 1–4 deletion in 20 patients with PCD and exome data of 1435 patients in the Seoul National University Hospital repository. In cases of suspected DRC1 deletion, confirmatory gap-PCR was performed. In a PCD cohort, three of 20 (15%) patients were positive for DRC1 exon 1–4 deletion (NM_145038.5(DRC1): c.1‐3952_540 + 1331del27748‐bp) while pathogenic variants were found in CCDC39 (N = 1), DNAAF6 (N = 1), DNAH9 (N = 1). In the 1,435-sample exome data, seven patients (0.49%) were confirmed to have DRC1 exon 1–4 deletion. A chimeric sequence including the junction was searched from the 1000 Genomes Project data repository. One Japanese patient (0.96%) was found to have the same DRC1 exon 1–4 deletion, which was absent in other populations. This study demonstrated that the DRC1 exon 1–4 deletion is a founder mutation based on haplotype analysis. In summary, the prevalence of PCD based on DRC1 exon 1–4 deletion is particularly high in Korean and Japanese populations, which is attributed to the founder effect. Genetic testing for DRC1 exon 1–4 deletion should be considered as an initial screening tool for Korean and Japanese patients with PCD.

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Funding

This research was supported by a fund (2020-ER6904-01) by Research of Korea Centers for Disease Control and Prevention. JM was supported by the Seoul National University Hospital Research Fund (0320210170).

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Correspondence to Moon-Woo Seong or Jangsup Moon.

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Kim, M.J., Kim, S., Chae, S.W. et al. Prevalence and founder effect of DRC1 exon 1–4 deletion in Korean patients with primary ciliary dyskinesia. J Hum Genet 68, 369–374 (2023). https://doi.org/10.1038/s10038-023-01122-8

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