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Related Experiment Videos

X-linked ichthyosis: an update.

A Hernández-Martín1, R González-Sarmiento, P De Unamuno

  • 1Fundacíon Hospital Vérin, Vérin, Ourense, Spain.

The British Journal of Dermatology
|December 3, 1999
PubMed
Summary

X-linked ichthyosis causes dry, scaly skin due to a steroid sulphatase enzyme (STS) deficit. Genetic analysis is the most accurate diagnostic method for patients and carriers.

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Area of Science:

  • Dermatology
  • Genetics
  • Biochemistry

Background:

  • X-linked ichthyosis is a keratinization disorder presenting with dark, adherent scales.
  • Extracutaneous features include corneal opacity and cryptorchidism.
  • A deficit in steroid sulphatase enzyme (STS) causes the scaling, but the mechanism is unclear.

Purpose of the Study:

  • To summarize the current understanding of X-linked ichthyosis.
  • To highlight the genetic basis and diagnostic approaches.

Main Methods:

  • Review of existing literature on X-linked ichthyosis.
  • Analysis of genetic mapping and deletion data for the STS gene.
  • Evaluation of diagnostic methods.

Main Results:

  • The STS gene, located on the X chromosome, is frequently deleted in patients (up to 90%).
  • This chromosomal region escapes X inactivation.
  • Genetic analysis is the most accurate diagnostic method.

Conclusions:

  • X-linked ichthyosis is a well-defined genetic disorder.
  • Accurate diagnosis relies on genetic testing for patients and carriers.

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