Skin tanning is a melanogenesis response to ultraviolet radiation DNA damage
Extensive scientific evidence confirms that skin tanning (melanogenesis) functions as a protective response triggered by ultraviolet radiation-induced DNA damage and its subsequent repair.
The retrieved papers consistently demonstrate that ultraviolet (UV) radiation causes DNA damage (such as cyclobutane pyrimidine dimers and strand breaks) in keratinocytes and melanocytes, which initiates signaling cascades (involving p53, POMC, and $\alpha$-MSH) that ultimately stimulate melanogenesis (tanning). Multiple studies explicitly note that DNA-damaging agents or DNA repair intermediates alone are sufficient to induce the tanning response, supporting the claim that tanning is a melanogenesis response to UV-induced DNA damage.
Joseph Michael Yardman-Frank, David E Fisher. Skin pigmentation and its control: From ultraviolet radiation to stem cells.. 2021. https://doi.org/10.1111/exd.14260
Ultraviolet radiation causes keratinocyte DNA damage, triggering p53-mediated POMC expression and subsequent melanogenesis.
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M S Eller, K Ostrom, B A Gilchrest. DNA damage enhances melanogenesis.. 1996. https://doi.org/10.1073/pnas.93.3.1087
DNA-damaging chemicals and ultraviolet irradiation upregulate tyrosinase and stimulate melanin production.
Nita Agar, Antony R Young. Melanogenesis: a photoprotective response to DNA damage?. 2005. https://doi.org/10.1016/j.mrfmmm.2004.11.016
Ultraviolet-induced DNA photodamage and its repair act as signals that stimulate melanogenesis.
B A Gilchrest, H Y Park, M S Eller, M Yaar. Mechanisms of ultraviolet light-induced pigmentation.. 1996. https://doi.org/10.1111/j.1751-1097.1996.tb02988.x
Ultraviolet-induced melanogenesis functions as part of a protective response to damaging ultraviolet irradiation.
B A Gilchrest, M S Eller. DNA photodamage stimulates melanogenesis and other photoprotective responses.. 1999. https://doi.org/10.1038/sj.jidsp.5640178
DNA damage or DNA repair intermediates directly trigger tanning and other photoprotective responses.
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