Disease	Some clinical features	Mutant genes
Xeroderma Pigmentosum (XP)	sun sensitivity, 10,000X increase skin cancer, XP neurologic disease (some patients, especially XP-A)	XPA-G, V
Cockayne Syndrome (CS)	sun sensitivity, no skin cancer, CS neurologic disease, progeriod features, growth defects	CSA, CSB
XP/CS complex	sun sensitivity, increased skin cancer, CS neurologic disease	XPB, XPD, XPG
Trichothiodystrophy (TTD)	sun sensitivity (some patients), brittle hair, ichthyosis, TTD neurologic disease (neurodevelopmental and myelination abnormalities)	XPD, TTDA, others?
UV-sensitive syndrome (UVsS)	sun sensitivity, no increased skin cancer, no neurologic disease	CSA, CSB, UVSSA