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Related Experiment Videos

The heritability of polymorphic light eruption.

T P Millard1, V Bataille, H Snieder

  • 1St John's Institute of Dermatology, London, U.K. thomas.millard@kcl.ac.uk

The Journal of Investigative Dermatology
|August 22, 2000
PubMed
Summary
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Polymorphic light eruption (PLE) shows a strong genetic influence, with 84% of susceptibility attributed to additive genetic factors. This finding supports further research into the genetic basis of this common photodermatosis.

Area of Science:

  • Dermatology
  • Genetics
  • Twin Studies

Background:

  • Polymorphic light eruption (PLE) is a common photodermatosis, often considered idiopathic and acquired.
  • Despite its classification, familial clustering suggests a potential genetic component.

Purpose of the Study:

  • To assess the heritability of polymorphic light eruption (PLE) using a classical twin model.
  • To quantify the genetic and environmental contributions to PLE susceptibility.

Main Methods:

  • A nurse-administered questionnaire was used to investigate PLE in 420 adult female twin pairs (119 MZ, 301 DZ).
  • Probandwise concordance rates were calculated, and quantitative genetic modeling (Mx software) was applied.
  • Heritability was estimated using an additive genetic (A) and unique environmental (E) model.

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Main Results:

  • The prevalence of PLE was 21% in monozygotic (MZ) and 18% in dizygotic (DZ) twins.
  • Probandwise concordance was significantly higher in MZ twins (0.72) than in DZ twins (0.30).
  • Quantitative genetic modeling indicated that additive genetic factors account for 84% of the variance in PLE susceptibility.

Conclusions:

  • These findings establish a significant genetic influence on the susceptibility to polymorphic light eruption.
  • The results provide a foundation for identifying specific candidate genes involved in PLE pathogenesis.
  • Environmental factors account for the remaining 16% of susceptibility variance.