DNAprint Genomics (DNAG)

[worktoplay]

SlopsterSlasher...The study you cited is from early 2004. IMO, Dr. Sturm's involvement with pigmentation research and the University's involvement in researching melanoma risk phenotypes may help explain DNAPrint's decision to terminate their relationship with the Penn State Research Foundation in February of 2004. Perhaps they located a collaborator with more direct research experience in their area of interest:

http://hmg.oupjournals.org/cgi/content/abstract/13/4/447

Human Molecular Genetics, 2004, Vol. 13, No. 4 447-461
DOI: 10.1093/hmg/ddh043

Interactive effects of MC1R and OCA2 on melanoma risk phenotypes

David L. Duffy1, Neil F. Box2, Wei Chen2, James S. Palmer1,2, Grant W. Montgomery1, Michael R. James1, Nicholas K. Hayward1, Nicholas G. Martin1 and Richard A. Sturm2,*

1Queensland Institute of Medical Research, Brisbane, Australia and 2Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia

Received October 21, 2003; Accepted December 11, 2003

The relationships between MC1R gene variants and red hair, skin reflectance, degree of freckling and nevus count were investigated in 2331 adolescent twins, their sibs and parents in 645 twin families. Penetrance of each MC1R variant allele was consistent with an allelic model where effects were multiplicative for red hair but additive for skin reflectance. Of nine MC1R variant alleles assayed, four common alleles were strongly associated with red hair and fair skin (Asp84Glu, Arg151Cys, Arg160Trp and Asp294His), with a further three alleles having low penetrance (Val60Leu, Val92Met and Arg163Gln). These variants were separately combined for the purposes of this analysis and designated as strong ‘R’ (OR=63.3; 95% CI 31.9–139.6) and weak ‘r ’ (OR=5.1; 95% CI 2.5–11.3) red hair alleles. Red-haired individuals are predominantly seen in the R/R and R/r groups with 67.1 and 10.8%, respectively. To assess the interaction of the brown eye color gene OCA2 on the phenotypic effects of variant MC1R alleles we included eye color as a covariate, and also genotyped two OCA2 SNPs (Arg305Trp and Arg419Gln), which were confirmed as modifying eye color. MC1R genotype effects on constitutive skin color, freckling and mole count were modified by eye color, but not genotype for these two OCA2 SNPs. This is probably due to the association of these OCA2 SNPs with brown/green not blue eye color. Amongst individuals with a R/R genotype (but not R/r), those who also had brown eyes had a mole count twice that of those with blue eyes. This suggests that other OCA2 polymorphisms influence mole count and remain to be described.

Later,
W2P