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Related Experiment Videos

Mutation rates in mammalian genomes.

Sudhir Kumar1, Sankar Subramanian

  • 1Department of Biology, Arizona State University, Tempe, AZ 85287-1501, USA. skumar@asu.edu

Proceedings of the National Academy of Sciences of the United States of America
|January 17, 2002
PubMed
Summary

Mutation rates are similar across mammalian genes and lineages, suggesting replication-independent processes dominate. This finding helps estimate species divergence times using molecular clocks.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Point mutation rates are crucial for understanding genetic novelty and human diseases.
  • Existing theories suggest significant variation in mutation rates among mammalian genes and lineages.

Purpose of the Study:

  • To computationally analyze mutation rates across diverse placental mammals.
  • To determine the extent of mutation rate variation among genes and mammalian lineages.

Main Methods:

  • Computational analysis of 5,669 genes (17,208 sequences) from major placental mammal groups.
  • Assessment of mutation rate constancy per year and similarity across genes.

Main Results:

  • Mutation rate is approximately constant per year and largely similar among genes.
  • Mutation rates show similarity across mammalian lineages with diverse generation lengths and physiology.
  • Replication-independent mutational processes contribute significantly to the overall mutation rate.

Conclusions:

  • The average mammalian genome mutation rate is estimated at 2.2 x 10^-9 per base pair per year.
  • Findings indicate a greater role for replication-independent mutation processes.
  • This provides a refined basis for estimating species and population divergence times via molecular clocks.

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