Abstract
Centromeric chromatin defines the site of kinetochore formation and ensures faithful chromosome segregation. Centromeric identity is epigenetically specified by the incorporation of CENP-A nucleosomes. DNA replication presents a challenge for inheritance of centromeric identity because nucleosomes are removed to allow for replication fork progression. Despite this challenge, CENP-A nucleosomes are stably retained through S phase. We used BioID to identify proteins transiently associated with CENP-A during DNA replication. We found that during S phase, HJURP transiently associates with centromeres and binds to pre-existing CENP-A, suggesting a distinct role for HJURP in CENP-A retention. We demonstrate that HJURP is required for centromeric nucleosome inheritance during S phase. HJURP co-purifies with the MCM2-7 helicase complex and, together with the MCM2 subunit, binds CENP-A simultaneously. Therefore, pre-existing CENP-A nucleosomes require an S phase function of the HJURP chaperone and interaction with MCM2 to ensure faithful inheritance of centromere identity through DNA replication. Inheritance of centromere identity requires the transmission of CENP-A across DNA replication, when nucleosomes are disassembled ahead of the replication fork. Zasadzińska et al. demonstrate that CENP-A requires the dedicated CENP-A chaperone HJURP and interaction with the replicative helicase complex to retain and redeposit CENP-A following DNA replication.
Original language | English (US) |
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Pages (from-to) | 348-362.e7 |
Journal | Developmental Cell |
Volume | 47 |
Issue number | 3 |
DOIs | |
State | Published - Nov 5 2018 |
Keywords
- DNA replication
- centromere
- chromatin
- chromosome
- epigenetics
- helicase
- mitosis
- nucleosome
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Molecular Biology
- Cell Biology
- Developmental Biology