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Related Experiment Videos

Evolution of the Sry genes

P Pamilo1, R J O'Neill

  • 1Department of Genetics, University of Uppsala, Sweden. pekka.pamilo@genetik.uu.se

Molecular Biology and Evolution
|January 1, 1997
PubMed
Summary
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The Sry gene, crucial for sex determination in mammals, shows faster evolution in its terminal sequences compared to its core HMG boxes across primates, rodents, and bovids. This accelerated evolution in Sry

Area of Science:

  • Evolutionary biology
  • Genetics
  • Molecular evolution

Background:

  • The Sry gene is the primary sex-determining locus on the mammalian Y chromosome.
  • Understanding Sry gene evolution provides insights into mammalian sex determination mechanisms.
  • Previous studies have explored gene evolution but focused less on intragenic substitution rate correlations within Sry.

Purpose of the Study:

  • To analyze DNA sequence data of the Sry gene across different mammalian taxonomic groups.
  • To investigate the evolutionary rates of terminal sequences versus conserved HMG boxes within the Sry gene.
  • To compare the evolutionary patterns of Sry with other conserved-box genes and plant MADS-box genes.

Main Methods:

  • Comparative analysis of existing DNA sequence data for the Sry gene.

Related Experiment Videos

  • Analysis of synonymous (Ks) and nonsynonymous (Ka) nucleotide substitution rates.
  • Comparison of substitution rates between terminal regions and HMG boxes of Sry.
  • Cross-species comparison including primates, rodents, bovids, other mammalian genes (Sox, Msx), and plant MADS-box genes.

    • Main Results:

    • Terminal sequences of the Sry gene evolved faster than HMG boxes in primates, rodents, and bovids for both Ks and Ka.
    • This intragenic correlation between substitution rates was not observed in other conserved-box genes (Sox, Msx) or plant MADS-box genes.
    • In apes, the rate of nonsynonymous substitutions significantly exceeded synonymous substitutions in terminal Sry sequences.
    • No strong evidence supported the hypothesis linking high Sry evolutionary rates to promiscuous mating systems.

    Conclusions:

    • The terminal regions of the Sry gene exhibit accelerated evolution compared to its conserved HMG boxes across diverse mammalian groups.
    • The unique evolutionary dynamics of Sry suggest distinct selective pressures or functional constraints compared to other conserved-box genes.
    • The study did not find support for mating system promiscuity as the primary driver for Sry's rapid evolution.