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Single nucleotide polymorphisms in the MATP gene are associated with normal human pigmentation variation
Justin Graf1, Richard Hodgson, Angela van Daal
1Cooperative Research Centre for Diagnostics, School of Life Sciences, Queensland University of Technology, Brisbane, Queensland, Australia.
Human Mutation
|February 17, 2005
Summary
Two specific gene variations in the Membrane Associated Transporter Protein (MATP) gene are linked to normal variations in human skin, hair, and eye color, particularly in Caucasians.
Area of Science:
- Human genetics
- Pigmentation biology
- Population genetics
Background:
- Human physical pigmentation relies on melanin, influenced by over 100 genes.
- Oculocutaneous albinism (OCA) arises from melanin synthesis failure, with some forms linked to the Membrane Associated Transporter Protein (MATP) gene.
- The precise function of MATP in normal human pigmentation remains unclear.
Purpose of the Study:
- To investigate the association between two nonpathogenic single nucleotide polymorphisms (SNPs) in the MATP gene and normal variations in human pigmentation.
- To determine if specific MATP gene variants correlate with differences in skin, hair, and eye color across diverse populations.
Main Methods:
- Genotyping of 608 individuals from four population groups (Caucasians, Asians, African-Americans, Australian Aborigines) for two MATP gene polymorphisms: c.814G>A (p.Glu272Lys) and c.1122C>G (p.Phe374Leu).
- Analysis of allele frequencies and their distribution across different ethnic groups.
- Statistical analysis to assess the association between MATP genotypes and phenotypic traits (skin, hair, eye color).
Main Results:
- Significant differences in allele frequencies for both MATP polymorphisms were observed among the studied population groups.
- The 374Leu and 272Lys alleles of MATP showed a strong association with darker hair, skin, and eye color in Caucasian individuals.
- High odds ratios (ORs) were reported for specific genotypes, such as LeuLeu (ORs 25.63 for black hair, 28.65 for olive skin) and LysLys (ORs 43.23 for black hair, 8.27 for olive skin), with moderate ORs for eye color.
Conclusions:
- This study provides the first evidence of a significant association between specific MATP gene polymorphisms and normal human pigmentation variation.
- The findings suggest that variations in the MATP gene play a role in determining common human traits like skin, hair, and eye color.
- Further research into MATP's function could elucidate mechanisms underlying pigmentation diversity.