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Lack of NWC protein (c11orf74 homolog) in murine spermatogenesis results in reduced sperm competitiveness and impaired ability to fertilize egg cells in vitro

机译:小鼠精子发生过程中缺乏NWC蛋白(c11orf74同源物)导致精子竞争能力下降以及体外受精卵细胞的能力受损

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摘要

NWC is an uncharacterised protein containing three strongly conserved domains not found in any other known protein. Previously, we reported that the NWC protein is detected in cells in the germinal layer in murine testes (strain: C57BL/6), and its knockout results in no obvious phenotype. We determined the NWC expression pattern during spermatogenesis, and found this protein in spermatocytes and round spermatids, but not in epididymal sperm. Although NWC knockout males are fertile, we further characterised their reproductive potential employing non-standard mating that better simulates the natural conditions by including sperm competition. Such an approach revealed that the sperm of knockout males fail to successfully compete with control sperm. After analysing selected characteristics of the male reproductive system, we found that NWC knockout sperm had a reduced ability to fertilize cumulus-intact eggs during IVF. This is the first report describing a subtle phenotype of NWC knockout mice that could be detected under non-standard mating conditions. Our results indicate that NWC plays an important role in spermatogenesis and its deficiency results in the production of functionally impaired sperm.
机译:NWC是一种未表征的蛋白质,包含三个在其他任何已知蛋白质中均未发现的高度保守的结构域。以前,我们报道了在小鼠睾丸生发层的细胞中检测到NWC蛋白(菌株:C57BL / 6),其敲除没有明显的表型。我们确定了精子发生过程中的NWC表达模式,并在精细胞和圆形精子中发现了该蛋白,但在附睾精子中却没有。尽管NWC淘汰型雄性可育,但我们通过使用非标准交配进一步表征了它们的繁殖潜力,该交配包括精子竞争,从而更好地模拟了自然条件。这种方法表明,剔除雄性精子不能与对照精子成功竞争。分析男性生殖系统的选定特征后,我们发现NWC剔除精子在IVF期间受精卵的能力下降。这是第一个报告,描述了在非标准交配条件下可以检测到的NWC基因敲除小鼠的细微表型。我们的结果表明,NWC在精子发生中起重要作用,其缺乏会导致功能受损的精子产生。

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