Analysis of cultured human melanocytes based on polymorphisms within the SLC45A2/MATP, SLC24A5/NCKX5, and OCA2/P loci.
Single nucleotide polymorphisms (SNPs) within the SLC45A2/MATP, SLC24A5/NCKX5, and OCA2/P genes have been associated with natural variation of pigmentation traits in human populations. Here, we describe the characterization of human primary melanocytic cells genotyped for polymorphisms within the MATP, NCKX5, or OCA2 loci. On the basis of genotype, these cultured cells reflect the phenotypes observed by others in terms of both melanin content and tyrosinase (TYR) activity when comparing skin designated as either "White" or "Black". We found a statistically significant association of MATP-374L (darker skin) with higher TYR protein abundance that was not observed for any NCKX5-111 or OCA2 rs12913832 allele. MATP-374L/L homozygous strains displayed significantly lower MATP transcript levels compared to MATP-374F/F homozygous cells, but this did not reach statistical significance based on NCKX5 or OCA2 genotype. Similarly, we observed significantly increased levels of OCA2 mRNA in rs12913832-T (brown eye) homozygotes compared to rs12913832-C (blue eye) homozygous strains, which was not observed for MATP or NCKX5 gene transcripts. In genotype-phenotype associations performed on a collection of 226 southern European individuals using these same SNPs, we were able to show strong correlations in MATP-L374F, OCA2, and melanocortin-1 receptor with skin, eye, and hair color variation, respectively.
Cook
Anthony L
AL
Melanogenix Group, Institute for Molecular Bioscience, University of Queensland, Queensland, Australia.
Chen
Wei
W
Thurber
Amy E
AE
Smit
Darren J
DJ
Smith
Aaron G
AG
Bladen
Timothy G
TG
Brown
Darren L
DL
Duffy
David L
DL
Pastorino
Lorenza
L
Bianchi-Scarra
Giovanna
G
Leonard
J Helen
JH
Stow
Jennifer L
JL
Sturm
Richard A
RA
D000951:Antigens, Neoplasm / Q000235:genetics*; D017920:Antiporters / Q000235:genetics*; D002478:Cells, Cultured; D005127:Eye Color / Q000235:genetics; D005786:Gene Expression Regulation / Q000502:physiology; D005838:Genotype; D006200:Hair Color / Q000235:genetics; D006801:Humans; D008543:Melanins / Q000378:metabolism; D008544:Melanocytes / Q000166:cytology / Q000502:physiology*; D026901:Membrane Transport Proteins / Q000235:genetics*; D051739:Microphthalmia-Associated Transcription Factor / Q000378:metabolism; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide / Q000502:physiology; D011401:Promoter Regions, Genetic / Q000502:physiology; D012333:RNA, Messenger / Q000378:metabolism; D044102:Receptor, Melanocortin, Type 1 / Q000235:genetics; D012867:Skin / Q000166:cytology; D012880:Skin Pigmentation / Q000235:genetics*; D044465:White People / Q000235:genetics
D000951:Antigens, Neoplasm; D017920:Antiporters; C497234:MITF protein, human; D008543:Melanins; D026901:Membrane Transport Proteins; D051739:Microphthalmia-Associated Transcription Factor; C489600:OCA2 protein, human; D012333:RNA, Messenger; D044102:Receptor, Melanocortin, Type 1; C506584:SLC24A5 protein, human; C510061:SLC45A2 protein, human