Selfish genetic elements and male fertility

Area of Science:

• Evolutionary Biology
• Genetics
• Reproductive Biology

Background:

• Selfish genetic elements (SGEs) are widespread in eukaryotes and significantly influence evolutionary processes.
• Certain SGEs specifically target sperm to enhance their own transmission to offspring.

Purpose of the Study:

• To review SGEs that act on sperm, focusing on their transmission advantages and costs to male carriers.
• To discuss the evolutionary dynamics of tolerance and mitigation strategies against these SGEs.
• To explore the broader implications of SGE-driven intra-genomic conflict for male fertility and spermatogenesis.

Main Methods:

• Literature review and synthesis of existing research on sperm-acting SGEs.
• Analysis of evolutionary mechanisms and consequences of SGEs in male reproductive systems.
• Discussion of host responses and their impact on sperm competition.

Main Results:

• Sperm-acting SGEs confer transmission advantages but often reduce male reproductive success.
• Observed costs include damaged ejaculates, skewed sex ratios, and decreased sperm competitiveness.
• Intra-genomic conflict arising from SGEs can negatively affect male fertility.

Conclusions:

• Understanding SGEs' impact on sperm is crucial for comprehending their evolutionary role.
• Further research is needed to elucidate the mechanisms of tolerance and mitigation in both sexes.
• SGEs represent a significant factor influencing male reproductive health and evolutionary trajectories.