Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0004135 (ATM)
 13,001 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The hereditary ataxias comprise a complex group of neurological disorders involving the cerebellum and its connections. Several classifications based on clinical and/or pathological data have been only partially successful. Recent progress in molecular genetics has identified the genic loci of hereditary ataxias and has allowed a more precise diagnosis of distinct genetic diseases. Trinucleotide repeat expansions has been recognized as a mechanism of disease in some autosomal dominant spinocerebellar ataxias (ADCA) (SCA1 to SCA7), including Machado-Joseph disease/SCA3, probably the most common form of ADCA in South Brazil, and Friedreich ataxia (GAA expansion-chromosome 9p). Familial alpha-tocopherol deficiency (chromosome 8q) may have a Friedreich ataxia phenotype and responds to the oral supplementation with vitamin E. Familial episodic ataxias with (EA1-chromosome 12p) and without (chromosome 19p-EA2) myokimia were identified, the first one caused by point mutations in the gene encoding the KCNA1 potassium voltage-gated channel. The gene responsible for ataxia-teleangiectasia (chromosome 11q) was found to encode a putative DNA binding protein kinase (ATM), related to the cell cycle control. One to 3% of the population are heterozygotic ATM gen carry and pose a higher risk of cancer when exposed to ionizing radiation. Molecular biology has provided us with useful tools to diagnosis and genetic counseling and, hopefully, will provide us with a better understanding of the pathogenesis and eventual treatment of the several forms of hereditary ataxias.
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PMID:[Hereditary cerebellar ataxias: from hammer to genetics]. 962 25

This review broadly covers the commoner genetic ataxias, concentrating on their clinical features. Over the last two decades there has been a potentially bewildering profusion of newly described genetic ataxias. However, at least half of dominant ataxias (SCAs) are caused by (CAG)n repeat expansions resulting in expanded polyglutamine tracts (SCAs 1, 2, 3, 6, 7, 17, and DRPLA), although of the remainder only SCAs 8, 10, 12, 14, 15/16, and 31 are frequent enough that the described phenotype is probably representative. Though the SCAs can be difficult to separate clinically, variations in prevalence in different populations, together with various clinical and radiological features, at least help to order the pretest probabilities. The X-linked disorder, fragile-X tremor ataxia syndrome occurs in fragile-X permutation carriers, and typically causes a late-onset ataxia-plus syndrome. The recessive ataxias are not named systematically: The most frequent are Friedreich, ataxia telangiectasia, ARSACS, AOA1 and 2, and the various POLG syndromes. Although rare, several other recessive disorders such as AVED are potentially treatable and should not be missed. Another group of genetic ataxias are the dominant episodic ataxias, of which EA1 and EA2 are the most important. Lastly, the neurologist's role in ongoing management, rather than just diagnosis, is addressed.
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PMID:Genetic cerebellar ataxias. 2519 6