FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Human Disease Model Report: xeroderma pigmentosum, complementation group D
Open Close
General Information
Name
xeroderma pigmentosum, complementation group D
FlyBase ID
FBhh0000205
Disease Ontology Term
Parent Disease
Overview

This report describes xeroderma pigmentosum, complementation group D (XPD), which is a subtype of xeroderma pigmentosum; XPD exhibits autosomal recessive inheritance. The human gene implicated in this disease is Excision Repair Cross-Complementation Group 2 (ERCC2), which is encodes a DNA helicase that is a component of the TFIIH basal transcription factor. There is a single fly ortholog, Xpd, for which classical loss-of-function alleles, RNAi-targeting constructs, and alleles caused by insertional mutagenesis have been generated. ERCC2 is also implicated in several other human diseases, including a subtype of trichothiodystrophy (TTD; see MIM:126340 and human disease model report FBhh0000709).

The human ERCC2 gene has not been introduced into flies.

Variant(s) implicated in human disease tested (as analogous mutation in fly gene): R112H in the fly Xpd gene (corresponds to R112H in the human ERCC2 gene); R683W in the fly Xpd gene (corresponds to R683W in the human ERCC2 gene); D234N in the fly Xpd gene (corresponds to D234N in the human ERCC2 gene); G47R in the fly Xpd gene (corresponds to G47R in the human ERCC2 gene); G675R in the fly Xpd gene (corresponds to G675R in the human ERCC2 gene); R601L in the fly Xpd gene (corresponds to R601L in the human ERCC2 gene). In addition, a variant analogous to one implicated in TTD1 has been characterized; see FBhh0000709.

Amorphic alleles of the Drosophila Xpd gene are lethal during late embryogenesis; embryonic phenotypes, including radiation sensitivity, have been assayed. Physical and genetic interactions of Dmel\Xpd have been described; see below and in the Xpd gene report.

[updated Jan. 2018 by FlyBase; FBrf0222196]

Disease Summary Information
Parent Disease Summary: xeroderma pigmentosum
Symptoms and phenotype

Xeroderma pigmentosum is characterized by increased sensitivity to sunlight with the development of carcinomas at an early age. Some patients develop neurologic symptoms or a more severe clinical phenotype known as de Sanctis-Cacchione syndrome (MIM:278800) (Satokata et al., 1992; pubmed:1372102). [from MIM:278700; 2016.03.09]

Xeroderma pigmentosum (XP) is an inherited condition characterized by an extreme sensitivity to ultraviolet (UV) rays from sunlight, affecting repeatedly exposed skin and the eyes, and by a greatly increased risk of developing skin cancer. About 30 percent of people with xeroderma pigmentosum also develop progressive neurological abnormalities. [from Genetics Home Reference, Xeroderma pigmentosum; 2016.03.23]

Specific Disease Summary: xeroderma pigmentosum, complementation group D
OMIM report

[XERODERMA PIGMENTOSUM, COMPLEMENTATION GROUP D; XPD](https://omim.org/entry/278730)

Human gene(s) implicated

[ERCC EXCISION REPAIR 2, TFIIH CORE COMPLEX HELICASE SUBUNIT; ERCC2](https://omim.org/entry/126340)

Symptoms and phenotype

See general description above.

Genetics

Xeroderma pigmentosum complementation group D (XPD) is caused by homozygous or compound heterozygous mutation in the excision repair gene ERCC2. [from MIM:278730; 2016.03.09]

Cellular phenotype and pathology
Molecular information

ERCC2 encodes an ATP-dependent DNA helicase that functions in nucleotide excision repair as a component of the core-TFIIH basal transcription factor. ERCC2 belongs to the RAD3/XPD subfamily of helicases. [from Gene Cards, ERCC2; 2016.03.23]

External links
Disease synonyms
xeroderma pigmentosum
xeroderma pigmentosum/Cockayne syndrome
xeroderma pigmentosum IV
XP/CS
XPD
XPDC
Ortholog Information
Human gene(s) in FlyBase
    Human gene (HGNC)
    D. melanogaster ortholog (based on DIOPT)
    Comments on ortholog(s)

    One to one: 1 human to 1 Drosophila.

    Other mammalian ortholog(s) used
      D. melanogaster Gene Information (1)
      Gene Snapshot
      Xeroderma pigmentosum D (Xpd) encodes a DNA helicase that is a subunit of the basal transcription and DNA repair factor TFIIH. [Date last reviewed: 2019-03-21]
      Gene Groups / Pathways
      Comments on ortholog(s)

      High-scoring ortholog of human ERCC2 (1 Drosophila to 1 human). Dmel\Xpd shares 69% identity and 84% similarity with the human gene.

      Orthologs and Alignments from DRSC
      DIOPT - DRSC Integrative Ortholog Prediction Tool - Click the link below to search for orthologs in Humans
      Other Genes Used: Viral, Bacterial, Synthetic (0)
        Summary of Physical Interactions (11 groups)
        protein-protein
        Interacting group
        Assay
        References
        anti bait coimmunoprecipitation, western blot
        anti tag coimmunoprecipitation, anti tag western blot, pull down, western blot
        anti tag coimmunoprecipitation, anti tag western blot
        anti bait coimmunoprecipitation, anti tag western blot, anti tag coimmunoprecipitation, western blot
        anti bait coimmunoprecipitation, western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting, experimental knowledge based
        anti tag coimmunoprecipitation, peptide massfingerprinting, experimental knowledge based
        pull down, anti tag western blot, anti tag coimmunoprecipitation
        anti tag coimmunoprecipitation, western blot
        anti tag coimmunoprecipitation, peptide massfingerprinting, experimental knowledge based
        anti bait coimmunoprecipitation, western blot
        Alleles Reported to Model Human Disease (Disease Ontology) (10 alleles)
        Models Based on Experimental Evidence ( 10 )
        Allele
        Disease
        Evidence
        References
        Modifiers Based on Experimental Evidence ( 0 )
        Allele
        Disease
        Interaction
        References
        Alleles Representing Disease-Implicated Variants
        Genetic Tools, Stocks and Reagents
        Sources of Stocks
        Contact lab of origin for a reagent not available from a public stock center.
        Bloomington Stock Center Disease Page
        Related mammalian, viral, bacterial, or synthetic transgenes
        Allele
        Transgene
        Publicly Available Stocks
        Selected Drosophila transgenes
        Allele
        Transgene
        Publicly Available Stocks
        RNAi constructs available
        Allele
        Transgene
        Publicly Available Stocks
        Selected Drosophila classical alleles
        Allele
        Allele class
        Mutagen
        Publicly Available Stocks
        References (8)