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Biallelic mutations of CFAP74 may cause human primary ciliary dyskinesia and MMAF phenotype

Abstract

Primary ciliary dyskinesia (PCD) is a rare genetic disorder characterized by recurrent respiratory infections, nasosinusitis, tympanitis, and/or male infertility, all of which can severely impair the patient’s quality of life. Multiple morphological abnormalities of the sperm flagella (MMAF) is one type of severe teratozoospermia and results from a variety of flagellar defects. In this study, we conducted whole-exome sequencing to identify and evaluate the genetic lesions in two patients with potential PCD and MMAF. Biallelic mutations in exon 10, c.983G>A; p.(Gly328Asp), and exon 29, c.3532G>A; p.(Asp1178Asn), of the CFAP74 (NM_001304360) gene were identified in patient 1 (P1), and biallelic mutations in exon 7, c.652C>T; p.(Arg218Trp), and exon 35, c. 4331G>C; p.(Ser1444Thr), of the same gene were identified in patient 2 (P2). Bioinformatic analysis suggested that these variants may be disease causing. Immunofluorescence confirmed that CFAP74 was absent in these patients’ sperm samples. Intracytoplasmic sperm injection (ICSI) was carried out for P1, and his wife became pregnant after embryo transfer and gave birth to a healthy baby. To the best of our knowledge, this study is the first to identify the importance of CFAP74 in potential PCD and MMAF, contributing to the genetic diagnosis of these disorders and helping to predict pregnancy outcomes relevant in in vitro fertilization.

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Acknowledgements

This study was supported by the open project of the Key Laboratory of Male Reproduction and Genetics, National Health and Family Planning Commission (No. KF201704), and the Natural Science Foundation of Shandong Province (Grant no. ZR2017LH012), the National Natural Science Foundation of China (Grant no. 81871200), and the Science and Technology Project of Fujian Province (Grant No. 2017D018).

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Correspondence to Wenrong Wang, Xuequan Zhang or Shaobin Lin.

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Sha, Y., Wei, X., Ding, L. et al. Biallelic mutations of CFAP74 may cause human primary ciliary dyskinesia and MMAF phenotype. J Hum Genet 65, 961–969 (2020). https://doi.org/10.1038/s10038-020-0790-2

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