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Related Experiment Videos

Evidence for variable selective pressures at MC1R.

R M Harding1, E Healy, A J Ray

  • 1Institute of Molecular Medicine, Oxford, United Kingdom.

American Journal of Human Genetics
|March 25, 2000
PubMed
Summary
This summary is machine-generated.

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The melanocortin 1 receptor (MC1R) gene shows strong functional constraint in Africa, indicating selection against changes in pigmentation. Outside Africa, MC1R diversity reflects relaxed constraint, not selection.

Area of Science:

  • Human genetics
  • Evolutionary biology
  • Population genetics

Background:

  • Genes influencing human skin and hair pigmentation are presumed to be under selection.
  • The melanocortin 1 receptor (MC1R) is the sole gene currently identified as a major determinant of human pigmentation variance.

Purpose of the Study:

  • To investigate MC1R gene polymorphism across diverse populations.
  • To identify evidence of selection acting on MC1R.

Main Methods:

  • Analysis of MC1R genetic variation in multiple human populations.
  • Examination of patterns of genetic diversity and amino acid variants.

Main Results:

  • MC1R exhibits strong functional constraint in African populations, with deviations from eumelanin production being evolutionarily disadvantageous.

Related Experiment Videos

  • Numerous MC1R variants in non-African populations impact receptor function and contribute to European MC1R diversity.
  • No evidence of selection-driven enhancement of MC1R diversity was found outside Africa.

    • Conclusions:

    • MC1R is under significant functional constraint in Africa, preserving eumelanin production.
    • MC1R polymorphism outside Africa is attributed to relaxed functional constraint rather than positive selection.
    • The observed diversity in MC1R in non-African populations aligns with neutral evolutionary expectations.