Xeroderma Pigmentosum - Types

Types

There are seven complementation groups, plus one variant form:

Type Diseases Database OMIM Gene Locus Also known as/Description
Type A, I, XPA 29877 278700 XPA 9q22.3 Xeroderma pigmentosum group A - the classical form of XP
Type B, II, XPB 29878 133510 XPB 2q21 Xeroderma pigmentosum group B
Type C, III, XPC 29879 278720 XPC 3p25 Xeroderma pigmentosum group C
Type D, IV, XPD 29880 278730 278800 XPD ERCC6 19q13.2-q13.3, 10q11 Xeroderma pigmentosum group D or De Sanctis-Cacchione syndrome (can be considered a subtype of XPD)
Type E, V, XPE 29881 278740 DDB2 11p12-p11 Xeroderma pigmentosum group E
Type F, VI, XPF 29882 278760 ERCC4 16p13.3-p13.13 Xeroderma pigmentosum group F
Type G, VII, XPG 29883 278780 133530 RAD2 ERCC5 13q33 Xeroderma pigmentosum group G and COFS syndrome type 3
Type V, XPV 278750 POLH 6p21.1-p12 Xeroderma pigmentosum variant - these patients suffer from mutation in a gene that codes for a specialized DNA polymerase called polymerase-η (eta). Polymerase-η can replicate over the damage and is needed when cells enter S-phase in the presence of a DNA-replication.

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