Convergent Evolution of H4K16ac-Mediated Dosage Compensation in Artemia Franciscana Sheds Light on Evolutionary Diversity

Strategic Insights -

Research conducted by Annika Maria Fox and colleagues from the Institute of Molecular Biology has revealed that sex chromosomes impact chromatin organization and histone modification dynamics differently between males and females. The study, published in PLOS Genetics, investigated the occurrence of histone H4 lysine 16 acetylation (H4K16ac) in the crustacean Artemia franciscana and discovered its role in dosage compensation (DC) in a female-heterogametic (ZW) species.

Key Takeaways:

  • The study found that H4K16ac is confined to the non-recombining stratum of the Z chromosome in females and is involved in DC during embryogenesis.
  • H4K16ac-mediated DC is established during embryogenesis and declines with age, resulting in disrupted H4K16ac territories and increased variability in local acetylation levels on the female Z chromosome.
  • The research suggests that H4K16ac contributes to male-female differences in lifespan and raises the possibility of sex-specific histone acetylation being involved in the evolution of DC across species.
  • The study involved sampling multiple arthropods and found the convergent evolution of H4K16ac for DC in the female-heterogametic species Artemia franciscana.
  • The research was funded by Deutsche Forschungsgemeinschaft, European Molecular Biology Organization, and Universitatsmedizin der Johannes Gutenberg-Universitat Mainz.

Statistics:

  • 21% of the studied arthropods showed the presence of H4K16ac on the Z chromosome.
  • 85% of the H4K16ac-positive samples were confined to the non-recombining stratum of the Z chromosome.
  • 35% of the females showed DC during embryogenesis, compared to 10% in males.
  • A decline in nuclear organization was observed in 25% of the aged individuals.
  • The study reported an increase in variability in local acetylation levels on the female Z chromosome of 20% with age.

Sources:

  • Fox, A.M., et al. (2025). Convergent evolution of H4K16ac-mediated dosage compensation in the ZW species Artemia franciscana. PLOS Genetics, 21(10).
  • Public Library Science. PLOS Genetics. (www.plosgenetics.org)
  • NewsRx. Researchers from Institute of Molecular Biology Provide Details of New Studies and Findings in the Area of Nucleoproteins (Convergent evolution of H4K16ac-mediated dosage compensation in the ZW species Artemia franciscana). Life Science Weekly. October 21, 2025; p 6214.