Female‐induced selective modification of sperm protein SUMOylation—potential mechanistic insights into the non‐random fertilization in humans

Kekäläinen, Jukka; Hiltunen, Johannes; Jokiniemi, Annalaura; Kuusipalo, Liisa; Heikura, Marjo; Leppänen, Jonna; Malinen, Marjo

doi:10.1111/jeb.13980

Cited by 5 publications

(1 citation statement)

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“…Classic example of these genes is the mouse selfish genetic element, the t haplotype (Lindholm et al, 2016 ). Additionally, it has been envisaged that de novo synthesis of both RNA and proteins may occur also in mature sperm (reviewed by Immler, 2019 ; Santiago et al, 2022 , see also Kekäläinen et al, 2022 ), which could potentially increase intercellular variation in sperm haploid gene expression even further. Identifying these differentially expressing genes and their functional importance for sperm and offspring phenotypic variation should be the key aim of the future studies.…”

Section: Evidence For Within‐male Cryptic Female Choicementioning

confidence: 99%

Cryptic female choice within individual males – A neglected component of the postmating sexual selection?

Kekäläinen

2022

J of Evolutionary Biology

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Cryptic female choice (CFC) is commonly assumed to act only in polyandrous mating systems, which allows females to bias fertilization towards the sperm of particular males. However, accumulated evidence has demonstrated that sperm show significant phenotypic and genotypic variation also within single ejaculates, which have important consequences for offspring phenotype and fitness. Here, I argue that these neglected sources of intra‐male sperm variation often allow CFC to act also within individual males and facilitate fertilization bias towards genetically compatible (or otherwise preferred) sperm haplotypes. In this article, I explain prerequisites for within‐male CFC, the criteria for demonstrating it and summarize accumulated evidence for this emerging selection process. Then, I evaluate prevalence of within‐male CFC and review its potential evolutionary consequences. The aim of this article is to broaden the current definition of CFC by demonstrating that CFC has potential to act in all mating systems, in both internally and externally fertilizing species. Incorporation of the within‐male CFC concept into the current models of sexual selection may provide novel insights into the deeper understanding of selective factors driving the evolution of mating systems and reproductive proteins. Finally, within‐male CFC towards particular sperm haplotypes may increase our understanding of non‐Mendelian inheritance.

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