Any xeroderma pigmentosum in which the cause of the disease is a mutation in the XPA gene. The disease is MONDO_0010210 (xeroderma pigmentosum group A). Also known as: XP group A, XP-A, XP1, XPA, XPA xeroderma pigmentosum, xeroderma pigmentosum 1, xeroderma pigmentosum caused by mutation in XPA, xeroderma pigmentosum complementation group A.