DNA replication-mediated error correction of ectopic CENP-A deposition maintains centromere identity

Abstract

Chromatin assembled with the histone H3 variant CENP-A is the heritable epigenetic determinant of human centromere identity. Using genome-wide mapping and reference models for 23 human centromeres, CENP-A is shown in early G1 to be assembled into nucleosomes within megabase, repetitive -satellite DNAs at each centromere and onto 11,390 transcriptionally active sites on the chromosome arms. Here we identify that DNA replication acts as an error correction mechanism to sustain centromere identity through the removal of the sites of CENP-A loading on the chromosome arms, while maintaining centromere-bound CENP-A with the same DNA sequence preferences as in its initial loading.