Spinocerebellar ataxias: an update.

Abstract:

PURPOSE OF REVIEW:Here we discuss recent advances regarding the molecular genetic basis of dominantly inherited ataxias. RECENT FINDINGS:Important recent observations include insights into the mechanisms by which expanded polyglutamine causes cerebellar degeneration; new findings regarding how noncoding expansions may cause disease; the discovery that conventional (i.e. nonrepeat) mutations underlie recently identified ataxias; and growing recognition that multiple biological pathways, when perturbed, can cause cerebellar degeneration. SUMMARY:The dominant ataxias, also known as spinocerebellar ataxias, continue to grow in number. Here we review the major categories of spinocerebellar ataxias: expanded polyglutamine ataxias; noncoding repeat ataxias; and ataxias caused by conventional mutations. After discussing features shared by these disorders, we present recent evidence supporting a toxic protein mechanism for the polyglutamine spinocerebellar ataxias and the recognition that both protein misfolding and perturbations in nuclear events represent key events in pathogenesis. Less is known about pathogenic mechanisms in spinocerebellar ataxias due to noncoding repeats, though a toxic RNA effect remains possible. Newly discovered, conventional mutations in spinocerebellar ataxias suggest a wide range of biological pathways can be disrupted to cause progressive ataxia. Finally, we discuss how new mechanistic insights can drive the push toward preventive treatment.

journal_name

Curr Opin Neurol

authors

Soong BW,Paulson HL

doi

10.1097/WCO.0b013e3281fbd3dd

subject

Has Abstract

pub_date

2007-08-01 00:00:00

pages

438-46

issue

4

eissn

1350-7540

issn

1473-6551

pii

00019052-200708000-00012

journal_volume

20

pub_type

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