Replication fork stability is essential for the maintenance of centromere integrity in the absence of heterochromatin.
The centromere of many eukaryotes contains highly repetitive sequences marked by methylation of histone H3K9 by Clr4(KMT1). This recruits multiple heterochromatin proteins, including Swi6 and Chp1, to form a rigid centromere and ensure accurate chromosome segregation. In the absence of heterochromatin, cells show an increased rate of recombination in the ... centromere, as well as chromosome loss. These defects are severely aggravated by loss of replication fork stability. Thus, heterochromatin proteins and replication fork protection mechanisms work in concert to prevent abnormal recombination, preserve centromere integrity, and ensure faithful chromosome segregation.
Mesh Terms:
Cell Cycle Proteins, Centromere, Chromosomal Proteins, Non-Histone, Chromosome Segregation, DNA Replication, Heterochromatin, Histones, Methyltransferases, Mutation, Recombination, Genetic, Schizosaccharomyces, Schizosaccharomyces pombe Proteins
Cell Cycle Proteins, Centromere, Chromosomal Proteins, Non-Histone, Chromosome Segregation, DNA Replication, Heterochromatin, Histones, Methyltransferases, Mutation, Recombination, Genetic, Schizosaccharomyces, Schizosaccharomyces pombe Proteins
Cell Rep
Date: Mar. 28, 2013
PubMed ID: 23478021
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