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Related Experiment Videos

Genetic heterogeneity in tuberous sclerosis.

L A Janssen1, L A Sandkuyl, E C Merkens

  • 1Department of Clinical Genetics, Academic Hospital Dijkzigt, The Netherlands.

Genomics
|October 1, 1990
PubMed
Summary

Tuberous sclerosis (TSC) is caused by two distinct genetic loci. This study identifies TSC1 on chromosome 9q34 and TSC2 on chromosome 11q23, confirming genetic heterogeneity in TSC.

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Area of Science:

  • Genetics
  • Medical Genetics
  • Human Disease Genetics

Background:

  • Tuberous sclerosis (TSC) is an autosomal dominant disorder.
  • TSC is characterized by widespread hamartomas.
  • Previous genetic linkage studies for TSC have yielded conflicting results, suggesting potential locus heterogeneity.

Purpose of the Study:

  • To investigate the genetic basis of Tuberous Sclerosis Complex (TSC).
  • To identify specific genetic loci responsible for TSC.
  • To confirm or refute the existence of genetic heterogeneity in TSC.

Main Methods:

  • Utilized multipoint linkage analysis.
  • Employed heterogeneity testing.
  • Studied a cohort of families with TSC.

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Main Results:

  • Obtained significant evidence for locus heterogeneity in TSC.
  • Identified two distinct loci responsible for TSC.
  • Localized one locus (TSC1) near the Abelson oncogene at 9q34.
  • Localized a second locus (TSC2) near the Lam L7 marker and dopamine D2 receptor gene at 11q23.

Conclusions:

  • TSC is genetically heterogeneous, caused by at least two different genes.
  • TSC1 is located on chromosome 9q34.
  • TSC2 is located on chromosome 11q23.