Subchronic elevation in ambient temperature drives alterations to the sperm epigenome and accelerates early embryonic development in mice

精子 生物 男科 胚胎 转录组 微量注射 胎儿 胚胎发生 热休克蛋白 毒物 细胞生物学 内科学 遗传学 怀孕 基因表达 基因 毒性 医学
作者
Natalie A. Trigg,John E. Schjenken,Jacinta H. Martin,David A. Skerrett‐Byrne,Shannon P. Smyth,Ilana R. Bernstein,Amanda L. Anderson,Simone J. Stanger,Ewan N. A. Simpson,Archana Tomar,Raffaele Teperino,Colin C. Conine,Geoffry N. De Iuliis,Shaun D. Roman,Elizabeth G. Bromfield,Matthew D. Dun,Andrew L. Eamens,Brett Nixon
出处
期刊:Proceedings of the National Academy of Sciences of the United States of America [National Academy of Sciences]
卷期号:121 (47) 被引量:2
标识
DOI:10.1073/pnas.2409790121
摘要

Forecasted increases in the prevalence and severity of extreme weather events accompanying changes in climatic behavior pose potential risk to the reproductive capacity of humans and animals of ecological and agricultural significance. While several studies have revealed that heat stress induced by challenges such as testicular insulation can elicit a marked negative effect on the male reproductive system, and particularly the production of spermatozoa, less is known about the immediate impact on male reproductive function following subchronic whole-body exposure to elevated ambient temperature. To address this knowledge gap, we exposed unrestrained male mice to heat stress conditions that emulate a heat wave (daily cycle of 8 h at 35 °C followed by 16 h at 25 °C) for a period of 7 d. Neither the testes or epididymides of heat-exposed male mice exhibited evidence of gross histological change, and similarly, spermatozoa of exposed males retained their functionality and ability to support embryonic development. However, the embryos generated from heat-exposed spermatozoa experienced pronounced changes in gene expression linked to acceleration of early embryo development, aberrant blastocyst hatching, and increased fetal:placental weight ratio. Such changes were causally associated with an altered sperm small noncoding RNA (sncRNA) profile, such that these developmental phenotypes were recapitulated by microinjection of wild-type embryos sired by control spermatozoa with RNAs extracted from heat-exposed spermatozoa. Such data highlight that even relatively modest excursions in ambient temperature can affect male reproductive function and identify the sperm sncRNA profile as a particular point of vulnerability to this imposed environmental stress.
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