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Post-transcriptional homeostasis and regulation of MCM2-7 in mammalian cells

Chen-Hua Chuang1, Dian Yang, Gongshi Bai

  • 1Department of Biomedical Sciences and Center for Vertebrate Genomics, Cornell University College of Veterinary Medicine, Ithaca, NY 14853, USA.

Nucleic Acids Research
|February 25, 2012
PubMed

Insights

The Mini Chromosome Maintenance (MCM2-7) complex is crucial for DNA replication. New research reveals MCM4 mutations reduce MCM mRNA via microRNAs and MCM3 inhibits MCM complex loading, impacting cell growth and causing genomic instability.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The Mini Chromosome Maintenance (MCM2-7) complex is essential for DNA replication.
  • Defects in MCMs lead to genomic instability, cancer, and developmental issues.
  • MCM protein levels can be coordinately regulated.

Purpose of the Study:

  • To elucidate novel mechanisms regulating MCM protein levels and pre-replicative complex (pre-RC) formation.
  • To investigate the role of the Mcm4(Chaos3) allele in MCM regulation.
  • To identify new regulators of MCM complex assembly and chromatin loading.

Main Methods:

  • Utilized mice and cells with a hypomorphic Mcm4 allele (Chaos3) and disruption alleles of other MCMs.
  • Investigated Dicer1 and Drosha-dependent mRNA regulation.
  • Analyzed MCM protein interactions and chromatin recruitment.

Main Results:

  • The Mcm4(Chaos3) allele disrupts MCM4:MCM6 interaction, causing a Dicer1/Drosha-dependent reduction in Mcm2-7 mRNAs.
  • Decreased MCM mRNAs correlate with increased miR-34 family microRNAs, known to target MCMs.
  • MCM3 acts as a negative regulator by complexing with MCM5, preventing MCM loading onto chromatin.

Conclusions:

  • MCM stoichiometry and localization are controlled post-transcriptionally at both mRNA and protein levels.
  • Disruptions in these regulatory pathways lead to cell growth defects and disease phenotypes in mice.
  • Identified novel mechanisms involving microRNAs and MCM3 in MCM complex regulation.

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