1932

Abstract

Trinucleotide repeat expansion is increasingly recognized as a cause of neurogenetic diseases. To date, seven diseases have been identified as expanded repeat disorders: the fragile X syndrome of mental retardation (both FRAXA and FRAXE loci), myotonic dystrophy, X-linked spinal and bulbar muscular atrophy, Huntington’s disease, spinocerebellar ataxia type 1, dentatorubral-pallidoluysian atrophy, and Machado-Joseph disease. All are neurologic disorders, affecting one or more regions of the neuraxis. Moreover, five of the seven (the last five above) are progressive neurodegenerative disorders whose strikingly similar mutations suggest a common mechanism of neuronal degeneration. In this article we discuss specific characteristics of each trinucleotide repeat disease, review their shared clinical and genetic features, and address possible molecular mechanisms underlying the neuropathology in each disease. Particular attention is paid to the neurodegenerative diseases, all of which are caused by CAG repeats encoding polyglutamine tracts in the disease gene protein.

Loading

Article metrics loading...

/content/journals/10.1146/annurev.ne.19.030196.000455
1996-03-01
2024-03-29
Loading full text...

Full text loading...

/content/journals/10.1146/annurev.ne.19.030196.000455
Loading
  • Article Type: Review Article
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error