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Mitochondrial mutations may drive Y chromosome evolution.

Neil J Gemmell1, Frank Y T Sin

  • 1Department of Zoology, University of Canterbury, Christchurch, New Zealand. n.gemmell@zool.canterbury.ac.nz

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|March 14, 2002
PubMed
Summary

Human Y chromosome variation is low. We propose mitochondrial DNA mutations impairing male fertility reduce effective population size, driving Y chromosome evolution and low variability.

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Human Genomics

Background:

  • The human Y chromosome exhibits remarkably low nucleotide variation.
  • Existing hypotheses for this invariance include population bottlenecks, recent common ancestry, slow evolution, limited adaptive potential, or selective sweeps.
  • These hypotheses do not fully explain the observed patterns of Y chromosome diversity.

Purpose of the Study:

  • To propose an alternative theory for human Y chromosome evolution.
  • To investigate the potential role of the mitochondrial genome in shaping Y chromosome variability.
  • To link male fertility to effective population size and Y chromosome genetic diversity.

Main Methods:

  • This study is theoretical, proposing a new model based on existing genetic and evolutionary principles.

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  • It integrates concepts of mitochondrial inheritance, male fertility, effective population size, and Y chromosome variation.
  • No new experimental data were generated; the focus is on conceptual synthesis.

    • Main Results:

    • Maternal inheritance of mitochondrial DNA (mtDNA) mutations can negatively impact male fertility.
    • Reduced male fertility leads to a decrease in the effective population size (N(e)) of the species.
    • A smaller effective population size directly results in reduced genetic variability of the Y chromosome.

    Conclusions:

    • Mitochondrial genome mutations affecting male fertility offer a novel explanation for low Y chromosome nucleotide variation.
    • This mechanism provides a plausible alternative to existing theories, emphasizing inter-genomic interactions.
    • Understanding this interplay is crucial for a comprehensive view of human Y chromosome evolution and population genetics.