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Synchronized replication of genes encoding the same protein complex in fast-proliferating cells.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • DNA replication during S phase creates temporal gene dosage imbalance.
  • Dosage imbalance, particularly within protein complexes, can be toxic to cells.
  • Mechanisms cells use to manage replication-dependent dosage imbalance are not fully understood.

Purpose of the Study:

  • To investigate genomic-scale gene dosage imbalance between early- and late-replicating genes.
  • To test the synchronized replication hypothesis for maintaining stoichiometry within protein complexes.
  • To explore the evolutionary role of replication timing in cell proliferation and tumorigenesis.

Main Methods:

  • Genomic-scale validation of gene dosage imbalance in HeLa cells.
  • Analysis of replication timing for genes within protein complexes across different cell types.
  • Comparative analysis of replication timing patterns in fast-proliferating versus slow-proliferating cells.

Main Results:

  • Gene dosage imbalance between early- and late-replicating genes is confirmed at the genomic scale.
  • Genes encoding subunits of the same protein complex exhibit similar replication timing, especially in fast-proliferating cells.
  • Synchronized replication timing within protein complexes is observed in cancer cells but not differentiated cells, suggesting convergent evolution.

Conclusions:

  • The demand for gene dosage balance during S phase influences the replication-timing program.
  • Replication timing synchronization within protein complexes is relaxed during cell differentiation.
  • Tumorigenesis restores synchronized replication timing, likely due to shortened cell cycles and selection for dosage balance.