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Spontaneous mutation as a risk factor

J F Crow1

  • 1Department of Genetics, University of Wisconsin, Madison 53706, USA.

Experimental and Clinical Immunogenetics
|January 1, 1995
PubMed
Summary
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Human zygotes accumulate around 100 new mutations, with higher rates in males and increasing with paternal age. Quasi-truncation selection may prevent excessive genetic load from deleterious mutations.

Area of Science:

  • Human genetics
  • Population genetics
  • Evolutionary biology

Background:

  • Estimates suggest a human mutation rate of 1-2 x 10(-8) per nucleotide per generation.
  • The human genome contains approximately 3 x 10(9) nucleotide pairs.
  • A significant number of new mutations arise in each human zygote.

Purpose of the Study:

  • To estimate the total number of new mutations in a human zygote.
  • To investigate the factors influencing mutation rates, such as sex and paternal age.
  • To explore potential mechanisms for eliminating deleterious mutations from the population.

Main Methods:

  • Utilizing existing estimates of mutation rates and genome size.
  • Comparing mutation rates between males and females.

Related Experiment Videos

  • Analyzing the relationship between paternal age and mutation rate.
  • Modeling the impact of selection on new mutations.

    • Main Results:

    • The number of new mutations in a human zygote is estimated to be around 100.
    • Mutation rates are approximately ten times higher in males than females.
    • Mutation rates increase with paternal age.
    • Even a small fraction of selected mutations could lead to a significant genetic burden.

    Conclusions:

    • A substantial number of new mutations occur in each generation.
    • Differences in germline cell divisions likely explain sex-based mutation rate disparities.
    • Quasi-truncation selection is proposed as a mechanism to manage the genetic load without severe fitness costs.