POLR1G and xeroderma pigmentosum: From 3’→5’, these are: ERCC2/XPD [excision repair cross-complementing rodent repair deficiency, complementation group 2/xeroderma pigmentosum complementary group D]; PPP1R13L/IASPP/RAI [protein phosphatase 1, regulatory (inhibitor) subunit 13-like/inhibitory member of the apoptosis stimulating proteins of p53 (ASPP) family/RelA-associated inhibitor]; CD3EAP/ASE-1 [CD3e molecule, epsilon-associated protein/antisense to ERCC1)]; and ERCC1 [excision repair cross-complementing rodent repair deficiency, complementation group 1].4