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Tuberous sclerosis complex: genetic aspects.

H Northrup1

  • 1Department of Pediatrics, University of Texas Medical School-Houston 77030.

The Journal of Dermatology
|November 1, 1992
PubMed
Summary
This summary is machine-generated.

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Tuberous sclerosis complex (TSC) is a genetic disorder with autosomal dominant inheritance. Research has identified a primary TSC-causing gene locus on chromosome 9q, with evidence for additional genetic loci.

Area of Science:

  • Genetics
  • Medical Genetics
  • Molecular Biology

Background:

  • Tuberous sclerosis complex (TSC) is a genetic disorder with autosomal dominant inheritance.
  • Prevalence is at least 1 in 10,000, with variable expression leading to potential underdiagnosis.
  • The molecular basis and causative proteins have remained elusive.

Purpose of the Study:

  • To identify the mutated genes responsible for Tuberous Sclerosis Complex (TSC).
  • To investigate the genetic heterogeneity of TSC.
  • To understand the molecular basis of TSC.

Main Methods:

  • Positional cloning approach to identify mutated genes.
  • Analysis of genetic linkages to specific chromosomes.
  • Physical mapping of gene loci.

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Main Results:

  • Definite evidence for a TSC-causing locus on chromosome 9q (TSC-1), accounting for 33-50% of familial cases.
  • The TSC-1 locus has been narrowed to approximately two megabases.
  • Evidence suggests at least one additional TSC locus, indicating genetic heterogeneity.

Conclusions:

  • Genetic heterogeneity is abundant in Tuberous Sclerosis Complex.
  • A primary TSC-causing locus is confirmed on chromosome 9q.
  • Further molecular investigation will elucidate the complex nature and genetic basis of TSC.