Effect of minichromosome maintenance protein 2 deficiency on the locations of DNA replication origins

Genome Research
D KunnevS C Pruitt

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.

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Citations

Aug 16, 2016·Proceedings of the National Academy of Sciences of the United States of America·Alberto MorenoJ Julian Blow
Jan 4, 2017·PLoS Genetics·Steven C PruittAmy Freeland
Sep 16, 2017·PLoS Genetics·Devika SalimJennifer L Gerton
Dec 19, 2019·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·Michelle L HulkeAmnon Koren
Oct 18, 2018·Nucleic Acids Research·Teresa Casar TenaMelanie Philipp
Jul 20, 2019·Molecular Medicine Reports·Minjie DengLin Guo

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