Interaction between p53 codon 72 polymorphism and melanocortin 1 receptor variants on suntan response and cutaneous melanoma risk

Authors

  • H. Nan,

    1. Program in Molecular and Genetic Epidemiology
    2. Department of Epidemiology, Harvard School of Public Health, 677 Huntington Ave, Boston, MA 02115, U.S.A.
    3. Channing Laboratory, Department of Medicine
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  • A.A. Qureshi,

    1. Channing Laboratory, Department of Medicine
    2. Department of Dermatology, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, U.S.A.
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  • D.J. Hunter,

    1. Program in Molecular and Genetic Epidemiology
    2. Department of Epidemiology, Harvard School of Public Health, 677 Huntington Ave, Boston, MA 02115, U.S.A.
    3. Channing Laboratory, Department of Medicine
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  • J. Han

    1. Program in Molecular and Genetic Epidemiology
    2. Channing Laboratory, Department of Medicine
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  • Conflicts of interest
    None declared.

Hongmei Nan.
E-mail: hnan@hsph.harvard.edu

Summary

Background  Ultraviolet (UV) radiation-induced p53 activation promotes cutaneous pigmentation by increasing transcriptional activity of pro-opiomelanocortin (POMC) in the skin. Induction of POMC/α-melanocyte-stimulating hormone (α-MSH) activates the melanocortin 1 receptor (MC1R), resulting in skin pigmentation. The common p53 codon 72 polymorphism alters the protein’s transcriptional activity, which may influence the UV radiation-induced tanning response.

Objectives  We assessed the association of the p53 codon 72 polymorphism with tanning response, and its interaction with MC1R variants on tanning response and skin cancer risk.

Methods  The assessment was done in a nested case–control study within the Nurses’ Health Study [219 melanoma cases, 286 squamous cell carcinoma (SCC) cases, 300 basal cell carcinoma (BCC) cases and 874 controls], and among controls from four nested case–control studies within the Nurses' Health Study.

Results  We found that the p53 Proline (Pro) allele was positively associated with childhood tanning response only among black/dark brown-haired women. Compared with the Arginine/Arginine (Arg/Arg) genotype, odds ratios (ORs) of childhood tanning tendency for Arg/Pro and Pro/Pro genotypes were 1·59 (95% CI, 0·96–2·65) and 1·56 (95% CI, 0·55–4·40), respectively. The association between MC1R variants and childhood tanning tendency was similar in both p53 Arg/Arg genotype and Pro allele carriers (Arg/Pro or Pro/Pro). The association of the p53 Pro/Pro genotype with melanoma risk was strongest among women with light pigmentation, and with MC1R variants, with the joint risk categories having the highest overall risk. We did not observe such interaction for SCC and BCC.

Conclusions  Our study suggests the involvement of the p53 codon 72 polymorphism in the skin tanning response and potential interaction with skin pigmentation on melanoma risk. Further work is needed to evaluate the association between p53 and its associated proteins and skin cancer risk.

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