Abstract
Mutations in the CDC14A (Cell Division-Cycle 14A) gene, which encodes a conserved dual-specificity protein tyrosine phosphatase, have been identified as a cause of autosomal recessive non-syndromic hearing loss (DFNB32) and hearing impairment infertility male syndrome (HIIMS). We used next-generation sequencing to screen six deaf probands from six families segregating sensorineural moderate-to-profound hearing loss. Data analysis and variant prioritization were completed using a custom bioinformatics pipeline. We identified three homozygous loss of function variants (p.Arg345Ter, p.Arg376Ter, and p.Ala451Thrfs*43) in the CDC14A gene, segregating with deafness in each family. Of the six families, four segregated the p.Arg376Ter mutation, one family segregated the p.Arg345Ter mutation and one family segregated a novel frameshift (p.Ala451Thrfs*43) mutation. In-depth phenotyping of affected individuals ruled out secondary syndromic findings. This study implicates the p.Arg376Ter mutation might be as a founder mutation in the Iranian population. It also provides the first semen analysis for deaf males carrying mutations in exon 11 of CDC14A and reveals a genotype–phenotype correlation that delineates between DFNB32 and HIIMS. The clinical results from affected males suggest the NM_033313.2 transcript alone is sufficient for proper male fertility, but not for proper auditory function. We conclude that DFNB32 is a distinct phenotypic entity in males.
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Data availability
The data that support the findings of this study are openly available in Clinvar database at https://www.ncbi.nlm.nih.gov/clinvar/docs/submit/, reference number: SUB5843570.
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Acknowledgements
We are grateful to the patients and families for their valuable collaboration. KTB was supported by NIH/NIGMS grant T32 GM007748.
Funding
This work was supported by the Iran National Science Foundation (INSF) (grant number: 96011200).
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Mohseni, M., Akbari, M., Booth, K.T. et al. When transcripts matter: delineating between non-syndromic hearing loss DFNB32 and hearing impairment infertile male syndrome (HIIMS). J Hum Genet 65, 609–617 (2020). https://doi.org/10.1038/s10038-020-0740-z
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DOI: https://doi.org/10.1038/s10038-020-0740-z
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