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Related Concept Videos

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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Published on: September 27, 2012

Heterogeneous genomic molecular clocks in primates.

Seong-Ho Kim1, Navin Elango, Charles Warden

  • 1School of Biology, Georgia Institute of Technology, Atlanta, Georgia, United States of America.

Plos Genetics
|October 13, 2006
PubMed
Summary

Molecular clock rates differ across primate genomes. CpG sites show constant substitution rates due to methylation, while non-CpG sites vary with generation time, impacting phylogenetic analyses.

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Area of Science:

  • Genomics
  • Molecular Evolution
  • Primate Biology

Background:

  • Molecular clocks are crucial for estimating species divergence times.
  • Previous studies assumed a constant rate of molecular evolution across genomes.
  • CpG dinucleotides and their methylation patterns are known to influence mutation rates.

Purpose of the Study:

  • To investigate the heterogeneity of molecular clocks within primate genomes.
  • To determine if CpG sites and non-CpG sites exhibit different substitution patterns.
  • To assess the impact of genomic region-specific molecular clocks on phylogenetic inferences.

Main Methods:

  • Analysis of primate genomic data.
  • Comparison of single nucleotide substitution rates at CpG and non-CpG sites.
  • Evaluation of generation-time dependency of substitutions.

Main Results:

  • Significant differences observed in molecular clock rates between CpG and non-CpG sites.
  • Non-CpG sites exhibit generation-time dependency, suggesting replication errors.
  • CpG sites show relatively constant substitution rates, consistent with methylation-driven mutations.
  • Genomic regions with varying CpG frequencies may explain conflicting results in previous molecular clock studies.

Conclusions:

  • Molecular clocks are heterogeneous within primate genomes.
  • Different genomic regions possess distinct molecular clocks.
  • These findings necessitate consideration of regional clock variation in divergence time estimations and phylogenetic analyses.