title: Effect of minichromosome maintenance protein 2 deficiency on the locations of DNA replication origins.
abstract: 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.
authors.affiliation: Department of Molecular and Cellular Biology;
authors.forename: Dimiter
authors.initials: D
authors.lastname: Kunnev
authors.affiliation: Department of Molecular and Cellular Biology;
authors.forename: Amy
authors.initials: A
authors.lastname: Freeland
authors.affiliation: Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
authors.forename: Maochun
authors.initials: M
authors.lastname: Qin
authors.affiliation: Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Leach
authors.affiliation: Department of Biostatistics and Bioinformatics, Roswell Park Cancer Institute, Buffalo, New York 14263, USA.
authors.forename: Jianmin
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Molecular and Cellular Biology;
authors.forename: Rajani M
authors.initials: RM
authors.lastname: Shenoy
authors.affiliation: Department of Molecular and Cellular Biology; steven.pruitt@roswellpark.org.
authors.forename: Steven C
authors.initials: SC
authors.lastname: Pruitt
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002843:Chromatin / Q000235:genetics; D056915:DNA Copy Number Variations / Q000235:genetics; D004261:DNA Replication / Q000235:genetics*; D016193:G1 Phase / Q000235:genetics; D042822:Genomic Instability / Q000235:genetics; D006801:Humans; D051379:Mice; D064111:Minichromosome Maintenance Complex Component 2 / Q000235:genetics*; D023421:Models, Animal; D009369:Neoplasms / Q000235:genetics*; D018741:Replication Origin / Q000235:genetics*; D017422:Sequence Analysis, DNA
chemical_list: D002843:Chromatin; C576318:Mcm2 protein, mouse; D064111:Minichromosome Maintenance Complex Component 2