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Pharmacologic Induction of Epidermal Melanin and Protection Against Sunburn in a Humanized Mouse Model

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Skin colour: A window into human phenotypic evolution and environmental adaptation.

Jiuming Liu¹, Habtom K Bitsue¹, Zhaohui Yang¹

¹Tianjian Laboratory of Advanced Biomedical Sciences, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, China.

Molecular Ecology

|May 7, 2024

Summary

Human skin color evolved dramatically with migration out of Africa, driven by adaptations to new environments. Genomic studies reveal 26 pigmentation genes and 48 SNPs influencing diverse skin tones across populations.

Keywords:

environmental adaptation modern humans molecular evolution skin colour

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Area of Science:

Human evolutionary genetics
Population genomics
Dermatology

Background:

Human skin color exhibits significant diversity, with darker tones prevalent in Africa and lighter tones in Eurasia.
This variation is a result of geographic adaptations to environmental challenges faced by modern humans dispersing globally.
Understanding the genetic basis of skin color is crucial for comprehending human evolution and adaptation.

Purpose of the Study:

To review current knowledge on the genetic mechanisms underlying human skin color diversity.
To identify key pigmentation genes and single nucleotide polymorphisms (SNPs) associated with skin color variation in different global populations.
To explore the role of environmental factors, local adaptation, and gene flow in shaping skin pigmentation.

Main Methods:

Comprehensive review of recent population-based genomic studies.
Analysis of genetic data focusing on pigmentation genes and SNPs across African, East Asian, and European populations.
Synthesis of findings related to gene-environment interactions and population-specific adaptations.

Main Results:

Identified 26 skin color-related pigmentation genes and 48 SNPs influencing skin color.
Detailed specific genes associated with skin color in African (e.g., MFSD12, SLC24A5), East Asian (e.g., OCA2, KITLG), and European (e.g., SLC24A5, MC1R) populations.
Highlighted the influence of diverse environments, local adaptation, gene flow, and multi-gene interactions on skin color diversity.

Conclusions:

Human skin color is a complex polygenic trait shaped by evolutionary pressures and geographic factors.
Genomic studies provide significant insights into the genetic architecture of skin pigmentation diversity.
Further research into gene-environment interactions and population-specific adaptations will enhance our understanding of human evolution.