Table 1.

Molecular Genetic Testing Used in SCA2

Gene 1MethodProportion of Probands with a Pathogenic Variant 2 Detectable by Method
ATXN2 Targeted analysis for pathogenic variants 3~100%
1.
2.

See Molecular Genetics for information on allelic variants detected in this gene.

3.

Detects abnormal number of CAG trinucleotide repeats. PCR amplification detects smaller CAG trinucleotide repeat expansions up to ~100 repeats. Southern blotting is required to detect highly expanded CAG trinucleotide repeat expansions (>100 repeats) and may be indicated in symptomatic infants and children [Mao et al 2002].

From: Spinocerebellar Ataxia Type 2

Cover of GeneReviews®
GeneReviews® [Internet].
Adam MP, Feldman J, Mirzaa GM, et al., editors.
Seattle (WA): University of Washington, Seattle; 1993-2024.
Copyright © 1993-2024, University of Washington, Seattle. GeneReviews is a registered trademark of the University of Washington, Seattle. All rights reserved.

GeneReviews® chapters are owned by the University of Washington. Permission is hereby granted to reproduce, distribute, and translate copies of content materials for noncommercial research purposes only, provided that (i) credit for source (http://www.genereviews.org/) and copyright (© 1993-2024 University of Washington) are included with each copy; (ii) a link to the original material is provided whenever the material is published elsewhere on the Web; and (iii) reproducers, distributors, and/or translators comply with the GeneReviews® Copyright Notice and Usage Disclaimer. No further modifications are allowed. For clarity, excerpts of GeneReviews chapters for use in lab reports and clinic notes are a permitted use.

For more information, see the GeneReviews® Copyright Notice and Usage Disclaimer.

For questions regarding permissions or whether a specified use is allowed, contact: ude.wu@tssamda.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.