MC1R Variation in a New Mexico Population

Area of Science:

• Genetics
• Dermatology
• Population Health

Background:

• The Melanocortin 1 Receptor (MC1R) gene plays a crucial role in human pigmentation.
• MC1R genetic variations are associated with melanoma risk, particularly in populations of European descent.
• Understanding MC1R's role in diverse populations is essential for accurate melanoma risk assessment.

Purpose of the Study:

• To evaluate single nucleotide polymorphisms (SNPs) in the MC1R gene within a multicultural New Mexico population.
• To determine the association of MC1R SNPs with self-identified race/ethnicity, skin type, and perceived cancer risk.
• To elucidate the role of MC1R in melanoma risk among diverse ethnic groups.

Main Methods:

• Genotyping of MC1R in 191 participants from a primary care clinic in Albuquerque, New Mexico.
• Collection of self-reported race/ethnicity, skin type, and perceived cancer risk data.
• Definition of genetic risk as the carriage of any of the nine most common MC1R SNPs.

Main Results:

• The MC1R SNP R163Q (rs885479) was more prevalent in self-identified Hispanics (47.6%) than non-Hispanic whites (NHW) (12.9%).
• Excluding R163Q, Hispanics showed lower genetic risk (33.3%) compared to NHW (48.3%), aligning with melanoma incidence.
• Hispanics reported significantly lower perceived cancer risk and nonsignificantly better tanning ability than NHW.

Conclusions:

• The R163Q variant may not confer increased melanoma risk among New Mexico Hispanics.
• Genetic risk factors for melanoma require careful interpretation within specific ethnic and population contexts.
• Extrapolation of genetic risk from Northern European to non-European populations may be inaccurate.