Histone acetyltransferases (HATs) directly link chromatin modification to g
ene activation. Recent structure/function studies provide insights into HAT
catalysis and histone binding, and genetic studies suggest cross-talk betw
een acetylation and other histone modifications. Developmental aberrations
in mice and certain human cancers are associated with HAT mutations, furthe
r highlighting the importance of these enzymes to normal cell growth and di
fferentiation.