NUCLEOSOMES AND TRANSCRIPTION - RECENT LESSONS FROM GENETICS

Substantial evidence exists that nucleosomes affect transcription and that additional factors modify nucleosome function. Recent work has de monstrated that different types of histone mutants can be classified b y their distinct effects on transcription in vivo. Additionally, the i dentification of proteins that interact with histones and,, notably, o f histone acetylases and deacetylases demonstrates that many factors a re involved in controlling the role of histones in transcription in vi vo.