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Pathogenic gene variants in CCDC39 , CCDC40 , RSPH1 , RSPH9 , HYDIN, and SPEF2 cause defects of sperm flagella composition and male infertility

Primary Ciliary Dyskinesia (PCD) is a rare genetic disorder affecting the function of motile cilia in several organ systems. In PCD, male infertility is caused by defective sperm flagella composition or deficient motile cilia function in the efferent ducts of the male reproductive system. Different...

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Published in:Frontiers in genetics 2023-02, Vol.14, p.1117821-1117821
Main Authors: Aprea, I, Wilken, A, Krallmann, C, Nöthe-Menchen, T, Olbrich, H, Loges, N T, Dougherty, G W, Bracht, D, Brenker, C, Kliesch, S, Strünker, T, Tüttelmann, F, Raidt, J, Omran, H
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creator Aprea, I
Wilken, A
Krallmann, C
Nöthe-Menchen, T
Olbrich, H
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Dougherty, G W
Bracht, D
Brenker, C
Kliesch, S
Strünker, T
Tüttelmann, F
Raidt, J
Omran, H
description Primary Ciliary Dyskinesia (PCD) is a rare genetic disorder affecting the function of motile cilia in several organ systems. In PCD, male infertility is caused by defective sperm flagella composition or deficient motile cilia function in the efferent ducts of the male reproductive system. Different PCD-associated genes encoding axonemal components involved in the regulation of ciliary and flagellar beating are also reported to cause infertility due to multiple morphological abnormalities of the sperm flagella (MMAF). Here, we performed genetic testing by next generation sequencing techniques, PCD diagnostics including immunofluorescence-, transmission electron-, and high-speed video microscopy on sperm flagella and andrological work up including semen analyses. We identified ten infertile male individuals with pathogenic variants in (one) and (two) encoding ruler proteins, (two) and (one) encoding radial spoke head proteins, and (two) and (two) encoding CP-associated proteins, respectively. We demonstrate for the first time that pathogenic variants in and cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH1 and RSPH9 composition. We also provide novel evidence for MMAF in - and -mutant individuals. We show absence or severe reduction of CCDC39 and SPEF2 in sperm flagella of - and -mutant individuals and - and -mutant individuals, respectively. Thereby, we reveal interactions between CCDC39 and CCDC40 as well as HYDIN and SPEF2 in sperm flagella. Our findings demonstrate that immunofluorescence microscopy in sperm cells is a valuable tool to identify flagellar defects related to the axonemal ruler, radial spoke head and the central pair apparatus, thus aiding the diagnosis of male infertility. This is of particular importance to classify the pathogenicity of genetic defects, especially in cases of missense variants of unknown significance, or to interpret variants that are confounded by the presence of the almost identical pseudogene .
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We demonstrate for the first time that pathogenic variants in and cause male infertility due to sperm cell dysmotility and abnormal flagellar RSPH1 and RSPH9 composition. We also provide novel evidence for MMAF in - and -mutant individuals. We show absence or severe reduction of CCDC39 and SPEF2 in sperm flagella of - and -mutant individuals and - and -mutant individuals, respectively. Thereby, we reveal interactions between CCDC39 and CCDC40 as well as HYDIN and SPEF2 in sperm flagella. Our findings demonstrate that immunofluorescence microscopy in sperm cells is a valuable tool to identify flagellar defects related to the axonemal ruler, radial spoke head and the central pair apparatus, thus aiding the diagnosis of male infertility. 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subjects asthenozoospermia
axonemal ruler
CP-complex
Genetics
MMAF
PCD
RS head
title Pathogenic gene variants in CCDC39 , CCDC40 , RSPH1 , RSPH9 , HYDIN, and SPEF2 cause defects of sperm flagella composition and male infertility
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