MEIOSIN retains a STRA8-independent activity that contributes to meiotic gene activation across vertebrates.

MEIOSIN independently activates meiotic genes across vertebrates, including species lacking STRA8, highlighting a conserved core mechanism in meiosis.

• Why it matters: Understanding the fundamental regulation of meiosis is crucial for insights into reproductive biology and fertility, especially given the variability of key regulators like STRA8 across species.
• What they did: The study used comparative genomics, genetic, and single-cell analyses in zebrafish and mice to investigate MEIOSIN's activity, identifying orthologs in species without STRA8 and examining their functions.
• The result: Findings reveal MEIOSIN's intrinsic ability to initiate meiotic gene activation independently of STRA8, suggesting a conserved core role that is augmented by STRA8 in certain lineages, impacting our understanding of meiotic regulation.