移码突变
精子无力症
男性不育
精子
生物
男科
轴丝
不育
精子活力
卵胞浆内精子注射
无精子症
鞭毛
遗传学
突变
基因
医学
怀孕
作者
Jiangshan Cong,Xiong Wang,Amir Amiri‐Yekta,Lingbo Wang,Zine‐Eddine Kherraf,Chunyu Liu,Caroline Cazin,Shuyan Tang,Seyedeh Hanieh Hosseini,Shixiong Tian,Abbas Daneshipour,Jiaxiong Wang,Yiling Zhou,Yuyan Zeng,Shenmin Yang,Xiaojin He,Jinsong Li,Yunxia Cao,Jin Li,Pierre F. Ray,Feng Zhang
标识
DOI:10.1136/jmedgenet-2021-107919
摘要
Background Oligoasthenoteratozoospermia is a typical feature of sperm malformations leading to male infertility. Only a few genes have been clearly identified as pathogenic genes of oligoasthenoteratozoospermia. Methods and results Here, we identified a homozygous frameshift variant (c.731dup, p.Asn244Lysfs*3) in CCDC34 , which is preferentially expressed in the human testis, using whole-exome sequencing in a cohort of 100 Chinese men with multiple morphological abnormalities of the sperm flagella (MMAF). In an additional cohort of 167 MMAF-affected men from North Africa, Iran and France, we identified a second subject harbouring a homozygous CCDC34 frameshift variant (c.799_817del, p.Glu267Lysfs*72). Both affected men presented a typical MMAF phenotype with an abnormally low sperm concentration (ie, oligoasthenoteratozoospermia). Transmission electron microscopy analysis of the sperm flagella affected by CCDC34 deficiency further revealed dramatic disorganisation of the axoneme. Immunofluorescence assays of the spermatozoa showed that CCDC34 deficiency resulted in almost absent staining of CCDC34 and intraflagellar transport-B complex-associated proteins (such as IFT20 and IFT52). Furthermore, we generated a mouse Ccdc34 frameshift mutant using CRISPR-Cas9 technology. Ccdc34 -mutated ( Ccdc34 mut/mut ) male mice were sterile and presented oligoasthenoteratozoospermia with typical MMAF anomalies. Intracytoplasmic sperm injection has good pregnancy outcomes in both humans and mice. Conclusions Our findings support that CCDC34 is crucial to the formation of sperm flagella and that biallelic deleterious mutations in CCDC34 / Ccdc34 cause male infertility with oligoasthenoteratozoospermia in humans and mice.
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