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Related Experiment Videos

Estimation of primate speciation dates using local molecular clocks.

A D Yoder1, Z Yang

  • 1Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, Illinois, USA. ayoder@nwu.edu

Molecular Biology and Evolution
|July 12, 2000
PubMed
Summary
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Mitochondrial genome analysis reveals challenges in estimating mammalian speciation dates. Third codon positions offer more reliable primate divergence estimates than amino acid sequences, despite molecular clock violations.

Area of Science:

  • Evolutionary Biology
  • Genomics
  • Molecular Evolution

Background:

  • Estimating speciation dates is crucial for understanding mammalian evolution.
  • Mitochondrial genomes offer valuable data for phylogenetic analyses.
  • Previous studies faced challenges due to molecular clock violations.

Purpose of the Study:

  • To estimate speciation dates in primates and rodents using mitochondrial protein-coding genes.
  • To evaluate the reliability of different data types and calibration points for divergence dating.
  • To investigate the impact of molecular clock models on evolutionary rate estimations.

Main Methods:

  • Analysis of protein-coding genes from mitochondrial genomes of 31 mammalian species.
  • Utilized three paleontological calibration points for divergence dating.

Related Experiment Videos

  • Applied global and local molecular clock models, including maximum likelihood approaches.
  • Compared results from nucleotide sequences, amino acid sequences, and third codon positions.

    • Main Results:

    • Global molecular clock was violated for both nucleotide and amino acid data.
    • Third codon positions provided more consistent primate divergence estimates than amino acid sequences.
    • Estimated dates varied significantly based on data type, calibration, and models.
    • Primate divergence estimates were generally consistent with paleontological records, but mouse-rat divergence was problematic.

    Conclusions:

    • Primate fossil record calibrations may be too recent for accurate dating.
    • Molecular clock violations pose significant challenges for divergence time estimation.
    • Third codon positions hold valuable phylogenetic information for primate evolution.
    • Further refinement of molecular clock models is needed for robust divergence dating.