Mapping DNA replication timing, allied to genetic analysis of a RecQ repair helicase, reveals that antigenic variation in the African trypanosome may be initiated by locus-specific, replication-derived sequence instability.
The first comprehensive analysis of antigenic switching in the malaria-causing parasite Plasmodium falciparum provides new insights into the process that prevents individuals from acquiring immunity to the disease.
While SET-2 methylates histone H3K36 during transcription, ASH1 methylates this residue in repressed regions, is important for silencing, and can both positively and negatively influence methylation of histone H3K27.
H3-G34R, V, and W oncohistonesin fission yeast cause differential K36 modification, DNA damage sensitivity and genome stability outcomes, highlighting the need for a thorough evaluation of distinct mutations.
Vast regions of facultative heterochromatin marked by methylation of lysine 27 on histone H3 depend on their proximity to chromosome ends and can be induced ectopically by insertion of telomere repeats.
Human herpesvirus 6B can transition between telomere-integrated and free viral forms, and frequent telomere-loop-driven partial or complete viral genome excision events create mosaicism in germline carriers of inherited chromosomally integrated HHV-6B.