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Xeroderma pigmentosum.

Alan R Lehmann1, David McGibbon, Miria Stefanini

  • 1Genome Damage and Stability Centre, University of Sussex, Falmer, Brighton BN1 9RQ, UK. a.r.lehmann@sussex.ac.uk

Orphanet Journal of Rare Diseases
|November 3, 2011
PubMed
Summary
This summary is machine-generated.

Xeroderma pigmentosum (XP) is a rare genetic disorder causing extreme sun sensitivity and a high risk of skin cancer due to defective DNA repair. Rigorous sun protection and early lesion removal can improve prognosis, but neurological issues may shorten lifespan.

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Area of Science:

  • Genetics
  • Dermatology
  • Molecular Biology

Background:

  • Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder characterized by extreme sensitivity to sunlight.
  • XP significantly elevates the risk of developing skin cancers due to impaired DNA repair mechanisms.
  • Incidences vary globally, with higher rates reported in Japan compared to the USA and Western Europe.

Purpose of the Study:

  • To define Xeroderma pigmentosum (XP), its clinical manifestations, genetic basis, and diagnostic criteria.
  • To elucidate the role of specific genes and their protein products in DNA repair pathways affected in XP.
  • To outline diagnostic methods, differential diagnoses, and management strategies for XP patients.

Main Methods:

  • Clinical diagnosis based on characteristic symptoms like severe sunburn, abnormal pigmentation, and early-onset skin cancers.
  • Confirmation through cellular tests assessing defective DNA repair capabilities.
  • Genetic analysis identifying mutations in eight complementation groups (XPA-XPV) involved in UV damage repair.

Main Results:

  • XP presents with variable clinical features, including extreme photosensitivity, lentiginosis, premature skin aging, and a high incidence of skin cancers.
  • Eight distinct genetic complementation groups (XPA-XPV) have been identified, each corresponding to a gene product crucial for DNA repair.
  • Defects in these genes lead to impaired repair of UV-induced DNA damage, with XPV involving DNA polymerase eta in replication.
  • Cellular tests confirm defective DNA repair, distinguishing XP from other photodermatoses and genetic syndromes.

Conclusions:

  • XP is a severe genetic disorder necessitating rigorous sun protection to minimize skin damage and cancer risk.
  • While there is no cure, management focuses on preventing sun exposure and early removal of pre-cancerous lesions.
  • Prognosis is generally good without neurological involvement, but progressive neurological abnormalities can lead to disability and reduced lifespan.