Updated
Updated · Nature.com · Aug 3
Researchers Map 12 Histone Marks Across 12 Species, Finding Conserved Activation but Divergent Gene Silencing
Updated
Updated · Nature.com · Aug 3

Researchers Map 12 Histone Marks Across 12 Species, Finding Conserved Activation but Divergent Gene Silencing

3 articles · Updated · Nature.com · Aug 3

Summary

  • A new iChIP2 chromatin-profiling method let researchers simultaneously track 12 histone modifications across 12 eukaryotic species, including amoebozoans, rhizarians, discobans and cryptomonads.
  • The cross-species analysis found euchromatin states at active promoters and gene bodies were highly conserved, suggesting core gene-activation programs are ancient across eukaryotes.
  • Repressive heterochromatin linked to silenced genes and transposable elements varied widely, with different lineages using combinations of H3K9me3, H3K27me3 and distinct H3K79 methylation states.
  • The findings indicate that while many histone modifications themselves are evolutionarily conserved, their functional readout has diversified, producing lineage-specific chromatin landscapes over eukaryotic evolution.

Insights

Why did nature lock the genetic activation switch for two billion years while letting the silencing switch mutate wildly?
Could the bizarre gene-silencing tactics of ancient amoebas hold the secret to defending human DNA against microscopic invaders?