ATR and xeroderma pigmentosum: Additionally, PKA-dependent ATR phosphorylation, occurring independently from MITF, recruits XPA (xeroderma pigmentosum, complementation group A) to the sites of the photodamage, promoting DNA repair [107,108,109,110,111], together with NR4A2 (Nuclear Receptor Subfamily 4 Group A Member 2), XPC and XPE (xeroderma pigmentosum, complementation group E) [108,112,113] (Figure 2).