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2015 ; 25
(4
): 558-69
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Effect of minichromosome maintenance protein 2 deficiency on the locations of DNA
replication origins
#MMPMID25762552
Kunnev D
; Freeland A
; Qin M
; Leach RW
; Wang J
; Shenoy RM
; Pruitt SC
Genome Res
2015[Apr]; 25
(4
): 558-69
PMID25762552
show ga
Minichromosome maintenance (MCM) proteins are loaded onto chromatin during
G1-phase and define potential locations of DNA replication initiation. MCM
protein deficiency results in genome instability and high rates of cancer in
mouse models. Here we develop a method of nascent strand capture and release and
show that MCM2 deficiency reduces DNA replication initiation in gene-rich regions
of the genome. DNA structural properties are shown to correlate with sequence
motifs associated with replication origins and with locations that are
preferentially affected by MCM2 deficiency. Reduced nascent strand density
correlates with sites of recurrent focal CNVs in tumors arising in MCM2-deficient
mice, consistent with a direct relationship between sites of reduced DNA
replication initiation and genetic damage. Between 10% and 90% of human tumors,
depending on type, carry heterozygous loss or mutation of one or more MCM2-7
genes, which is expected to compromise DNA replication origin licensing and
result in elevated rates of genome damage at a subset of gene-rich locations.