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Available structures
PDBOrtholog search: PDBe RCSB
AliasesXPA, XP1, XPAC, xeroderma pigmentosum, complementation group A, DNA damage recognition and repair factor
External IDsOMIM: 611153 MGI: 99135 HomoloGene: 37298 GeneCards: XPA
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)n/aChr 4: 46.16 – 46.2 Mb
PubMed search[2][3]
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DNA repair protein complementing XP-A cells is a protein that in humans is encoded by the XPA gene.[4]


Nucleotide excision repair (NER) is a major pathway for repairing a variety of bulky DNA damages including those introduced by UV irradiation. The XPA protein appears to play a key role in NER at sites of damage as a scaffold for other repair proteins in order to ensure that the damages are appropriately excised.[5] Among the repair proteins with which XPA interacts is a protein complex (including the ERCC1 protein) that is capable of incising DNA at sites of damage.[6]

Xpa mutant individuals often show the severe clinical symptoms of xeroderma pigmentosum, a condition involving extreme sensitivity to sunlight and a high incidence of skin cancer.


XPA has been shown to interact with ERCC1,[6][7] Replication protein A1[8] and XAB2.[9]


  1. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000028329 - Ensembl, May 2017
  2. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Entrez Gene: XPA xeroderma pigmentosum, complementation group A".
  5. ^ Sugitani N, Sivley RM, Perry KE, Capra JA, Chazin WJ (2016). "XPA: A key scaffold for human nucleotide excision repair". DNA Repair (Amst.). 44: 123–35. doi:10.1016/j.dnarep.2016.05.018. PMC 4958585. PMID 27247238.
  6. ^ a b Li L, Elledge SJ, Peterson CA, Bales ES, Legerski RJ (May 1994). "Specific association between the human DNA repair proteins XPA and ERCC1". Proceedings of the National Academy of Sciences of the United States of America. 91 (11): 5012–6. Bibcode:1994PNAS...91.5012L. doi:10.1073/pnas.91.11.5012. PMC 43920. PMID 8197174.
  7. ^ Nagai A, Saijo M, Kuraoka I, Matsuda T, Kodo N, Nakatsu Y, Mimaki T, Mino M, Biggerstaff M, Wood RD (Jun 1995). "Enhancement of damage-specific DNA binding of XPA by interaction with the ERCC1 DNA repair protein". Biochemical and Biophysical Research Communications. 211 (3): 960–6. doi:10.1006/bbrc.1995.1905. hdl:1765/60251. PMID 7598728.
  8. ^ Li L, Lu X, Peterson CA, Legerski RJ (Oct 1995). "An interaction between the DNA repair factor XPA and replication protein A appears essential for nucleotide excision repair". Molecular and Cellular Biology. 15 (10): 5396–402. doi:10.1128/mcb.15.10.5396. PMC 230789. PMID 7565690.
  9. ^ Nakatsu Y, Asahina H, Citterio E, Rademakers S, Vermeulen W, Kamiuchi S, Yeo JP, Khaw MC, Saijo M, Kodo N, Matsuda T, Hoeijmakers JH, Tanaka K (Nov 2000). "XAB2, a novel tetratricopeptide repeat protein involved in transcription-coupled DNA repair and transcription". The Journal of Biological Chemistry. 275 (45): 34931–7. doi:10.1074/jbc.M004936200. hdl:1765/3168. PMID 10944529.

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