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Related Experiment Videos

A link between repetitive sequences and gene replication time.

M Regelson1, C D Eller, S Horvath

  • 1UCLA Department of Human Genetics, Gonda Center, David Geffen School of Medicine, Los Angeles, CA, USA.

Cytogenetic and Genome Research
|February 18, 2006
PubMed
Summary
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Gene replication timing in Drosophila is linked to repetitive DNA sequences. Specific repetitive elements like Satellite-Related sequences (SRs) and simple sequence repeats (SSRs) correlate with gene replication timing, influencing genome organization.

Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Gene replication timing varies, generally correlating with transcriptional states (early=competent, late=repressive).
  • Some exceptions suggest repressive states are not uniform.
  • The influence of repetitive sequences on replication timing is largely unexplored.

Purpose of the Study:

  • To investigate the correlation between gene replication times and repetitive DNA sequences in Drosophila.
  • To identify specific repetitive sequences associated with early or late replication.

Main Methods:

  • Analysis of replication times for over 4000 Drosophila genes.
  • Quantification of repetitive sequences (Satellite-Related sequences and simple sequence repeats) in flanking genomic regions.

Related Experiment Videos

  • Statistical correlation analysis between repeat abundance and gene replication timing.

    • Main Results:

    • Replication times of Drosophila genes correlate with repetitive sequence abundance in flanking 200-kb regions.
    • Satellite-Related sequences (SRs) and (CA)n, (ACTG)n SSRs increase with later replication timing.
    • (CATA)n SSRs are more abundant around early-replicating genes.
    • These four repeat types explain 5% of replication timing variation, despite comprising <0.5% of the euchromatic genome.

    Conclusions:

    • Repetitive sequences, particularly SRs and SSRs, are broadly associated with gene replication timing across 99% of the Drosophila genome.
    • These repeats may contribute to establishing transcriptionally repressive states to prevent spurious transcription.
    • The findings suggest a novel role for non-coding repetitive elements in genome regulation.