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Related Experiment Videos

An expanded CAG repeat sequence in spinocerebellar ataxia type 7

K Lindblad1, M L Savontaus, G Stevanin

  • 1Department of Molecular Medicine, Karolinska Hospital, Stockholm, Sweden. keli@gen.ks.se

Genome Research
|October 1, 1996
PubMed
Summary

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Spinocerebellar ataxia type 7 (SCA7) is caused by expanded CAG repeats, leading to a polyglutamine chain. This study used repeat expansion detection (RED) to confirm CAG repeat expansions in SCA7 families, strongly implicating them in the disease

Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • Expanded CAG repeat sequences are implicated in neurodegenerative disorders like spinocerebellar ataxia type 1 and Machado-Joseph disease.
  • These expansions code for elongated polyglutamine chains, with larger chains correlating to more severe disease and genetic anticipation.
  • Spinocerebellar ataxia type 7 (SCA7) is an autosomal dominant ataxia characterized by cerebellar cortex degeneration and anticipation.

Purpose of the Study:

  • To investigate the presence and role of CAG repeat expansions in Spinocerebellar ataxia type 7 (SCA7).
  • To confirm if CAG repeat expansions are the causative genetic mutation in SCA7.

Main Methods:

  • Utilized repeat expansion detection (RED), a method employing a thermostable ligase for direct detection of repeat expansions from genomic DNA.

Related Experiment Videos

  • Analyzed 8 SCA7 families for the presence of CAG repeat expansions.

    • Main Results:

    • RED products ranging from 150-240 bp were detected in all affected individuals across the analyzed SCA7 families.
    • These findings showed strong cosegregation with the disease (P < 0.000001, n = 66).
    • Estimated average expansion size in SCA7 to be 64 CAG copies based on prior correlations.

    Conclusions:

    • The presence and cosegregation of CAG repeat expansions strongly indicate they are the cause of SCA7.
    • This finding contributes to understanding the genetic basis of SCA7 and related polyglutamine diseases.