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Hypopigmentation in Angelman syndrome

R A King1, G L Wiesner, D Townsend

  • 1Department of Medicine, University of Minnesota, Minneapolis 55455.

American Journal of Medical Genetics
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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Individuals with Angelman syndrome (AS) exhibit hypopigmentation, including light skin, reduced retinal pigment, and low hairbulb tyrosinase activity. This pigment pattern is similar to that observed in Prader-Willi syndrome (PWS).

Area of Science:

  • Genetics
  • Dermatology
  • Ophthalmology

Background:

  • Chromosome region 15q is implicated in melanin synthesis for hair, skin, and eyes.
  • Hypopigmentation is a known feature of Prader-Willi syndrome (PWS) and Angelman syndrome (AS).

Purpose of the Study:

  • To characterize the specific pigment patterns in individuals diagnosed with Angelman syndrome.
  • To compare the hypopigmentation in AS with that observed in PWS.

Main Methods:

  • Examination of 6 individuals with AS (ages 2.4-7.0 years).
  • Assessment of hair color, skin type, and eye changes (nystagmus, strabismus, retinal pigment).
  • Measurement of hairbulb tyrosinase activity and electron microscopic analysis of melanocytes.

Main Results:

Related Experiment Videos

  • AS individuals presented with light skin (Type I/II), varied hair color, and ocular abnormalities including reduced retinal pigment.
  • Mean hairbulb tyrosinase activity in AS was significantly lower than controls.
  • Melanocyte analysis revealed reduced melanin formation and incomplete melanosome maturation in AS.

Conclusions:

  • Hypopigmentation, characterized by light skin, reduced retinal pigment, low tyrosinase activity, and incomplete melanization, is a component of the Angelman syndrome phenotype.
  • The observed pigmentary features in AS are comparable to those seen in Prader-Willi syndrome.