Centromere protein A (CENP-A) is a histone H3 variant that specifies centromere location, but the histone composition and stoichiometry of CENP-A nucleosomes have been controversial. ChIP-seq and biochemical analyses of in vitro–reconstituted CENP-A nucleosomes now demonstrate that the predominant form at functional centromeres is an octamer with loose DNA ends.
- Dan Hasson
- Tanya Panchenko
- Ben E Black