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Tammar wallaby CENP-A ChIP-seq

ABSTRACT: Chromatin immunoprecipitation from tammar wallaby pouch young cells for DNA bound to CENP-A

ORGANISM(S): Notamacropus eugenii

PROVIDER: GSE30371 | GEO | 2011/07/28

SECONDARY ACCESSION(S): PRJNA154729

REPOSITORIES: GEO

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Tammar wallaby CENP-A ChIP-seq

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

Project description:Chromatin assembled with 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 a-satellite DNAs at each centromere and onto 11,390 sites on the chromosome arms. Centromere-bound CENP-A is found to be quantitatively maintained during DNA replication by coordinated action of the MCM2 helicase, CAF1, HJURP, and the CCAN network of constitutive centromere components. CCAN serves to tether CENP-A removed by MCM2, thereby enabling local reassembly onto both daughter centromeres with identical DNA sequence preferences and nucleosome phasing as the loading in G1 and independent of CENP-B. Conversely, without CCAN-mediated tethering, DNA replication removes CENP-A from sites on the chromosome arms. Our data identify an MCM2/CAF1/HJURP- and CCAN-dependent error correction mechanism that acts in S-phase to maintain CENP-A-dependent centromere identity.

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