A duplication at chromosome 11q12.2-11q12.3 is associated with spinocerebellar ataxia type 20.

Abstract:

:Spinocerebellar ataxia type 20 (SCA20) has been linked to chromosome 11q12, but the underlying genetic defect has yet to be identified. We applied single-nucleotide polymorphism genotyping to detect structural alterations in the genomic DNA of patients with SCA20. We found a 260 kb duplication within the previously linked SCA20 region, which was confirmed by quantitative polymerase chain reaction and fiber fluorescence in situ hybridization, the latter also showing its direct orientation. The duplication spans 10 known and 2 unknown genes, and is present in all affected individuals in the single reported SCA20 pedigree. While the mechanism whereby this duplication may be pathogenic remains to be established, we speculate that the critical gene within the duplicated segment may be DAGLA, the product of which is normally present at the base of Purkinje cell dendritic spines and contributes to the modulation of parallel fiber-Purkinje cell synapses.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Knight MA,Hernandez D,Diede SJ,Dauwerse HG,Rafferty I,van de Leemput J,Forrest SM,Gardner RJ,Storey E,van Ommen GJ,Tapscott SJ,Fischbeck KH,Singleton AB

doi

10.1093/hmg/ddn283

subject

Has Abstract

pub_date

2008-12-15 00:00:00

pages

3847-53

issue

24

eissn

0964-6906

issn

1460-2083

pii

ddn283

journal_volume

17

pub_type

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