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Heterozygosity increases microsatellite mutation rate.

William Amos1

  • 1Department of Zoology, Downing Street, Cambridge CB2 3EJ, UK w.amos@zoo.cam.ac.uk.

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|January 8, 2016
PubMed
Summary
This summary is machine-generated.

The heterozygote instability hypothesis suggests heterozygosity increases mutation rates. This study found rare alleles, indicating higher mutation rates, are more common at AC microsatellites with greater heterozygosity in human genomes.

Keywords:
heterozygosityheterozygote instabilityhumanmicrosatellitemutation ratetandem repeat

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Area of Science:

  • Genetics
  • Genomics
  • Evolutionary Biology

Background:

  • The heterozygote instability (HI) hypothesis posits that heterozygosity locally elevates mutation rates.
  • Previous studies on Arabidopsis supported HI for base substitutions, but evidence for microsatellites was limited and conflicting.
  • HI acting on microsatellites may create a positive feedback loop, mutually increasing heterozygosity and mutation rate.

Purpose of the Study:

  • To investigate the impact of heterozygote instability on AC microsatellites.
  • To determine if heterozygosity is associated with increased mutation rates at microsatellite loci.
  • To provide direct evidence for HI acting on microsatellites in a large human genome dataset.

Main Methods:

  • Analysis of AC microsatellites in 1163 genome sequences from the 1000 Genomes Project.
  • Utilized the frequency of rare alleles as a proxy for recent mutation rate.
  • Compared the occurrence of rare alleles across locus-population combinations with varying heterozygosity levels.

Main Results:

  • A positive correlation was observed between heterozygosity and the likelihood of rare alleles at AC microsatellite loci.
  • This association persisted even when controlling for the number of alleles present in each population.
  • Findings suggest that higher heterozygosity is linked to increased mutation rates at these specific microsatellite sequences.

Conclusions:

  • The study provides evidence supporting the heterozygote instability hypothesis acting on AC microsatellites.
  • Results indicate a potential positive feedback loop where heterozygosity drives microsatellite mutation.
  • The findings contribute to understanding mutation dynamics in non-coding genomic regions.