Journal of assisted reproduction and genetics · 2021
A novel splicing variant in DNAH8 causes asthenozoospermia.
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Zhou Zhou, Mao Xiaoyan, Chen Biaobang, Mu Jian, Wang Wenjing, Li Bin, Yan Zheng, Dong Jie, Li Qiaoli, Kuang Yanping, Wang Lei, Wu Ling, Sang Qing
Аннотация
PURPOSE: To identify the genetic factors responsible for asthenozoospermia, which is a major cause of male infertility characterized by immotile and malformed spermatozoa.
METHODS: Whole-exome sequencing was performed in two brothers from a family with asthenozoospermia to identify pathogenic variants. The functional effect of the identified variant was investigated in HEK293T cells using a minigene assay.
RESULTS: We identified a novel homozygous splicing variant c.6311-2A>G in DNAH8 from two affected brothers belonging to the same consanguineous family. The splicing variant altered a consensus splice acceptor site of DNAH8 intron 44, which led to the deletion of exon 45 and resulted in a frameshift and a predicted truncated protein (p.G2104Efs*19). Although most spermatozoa from the patients presented with reduced sperm motility, intracytoplasmic sperm injection was able to overcome the inability of the spermatozoa to reach the ovum and thus produce a healthy child for the proband.
CONCLUSIONS: This finding expands the mutational spectrum of DNAH8, making it a potential genetic diagnostic marker for those suffering from primary male infertility.
METHODS: Whole-exome sequencing was performed in two brothers from a family with asthenozoospermia to identify pathogenic variants. The functional effect of the identified variant was investigated in HEK293T cells using a minigene assay.
RESULTS: We identified a novel homozygous splicing variant c.6311-2A>G in DNAH8 from two affected brothers belonging to the same consanguineous family. The splicing variant altered a consensus splice acceptor site of DNAH8 intron 44, which led to the deletion of exon 45 and resulted in a frameshift and a predicted truncated protein (p.G2104Efs*19). Although most spermatozoa from the patients presented with reduced sperm motility, intracytoplasmic sperm injection was able to overcome the inability of the spermatozoa to reach the ovum and thus produce a healthy child for the proband.
CONCLUSIONS: This finding expands the mutational spectrum of DNAH8, making it a potential genetic diagnostic marker for those suffering from primary male infertility.