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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mutations revealed by sequencing the 5' half of the gene for ataxia telangiectasia.

Ataxia telangiectasia is a recessive disorder in which patients show a progressive cerebellar degeneration leading to ataxia, abnormal eye movements and deterioration of speech. Other features include ocular telangiectasia, high serum AFP levels, immunodeficiency, growth retardation and an increased predisposition to some tumours, particularly T cell leukaemia and lymphoma. We report the 1348 amino acid sequence of the N-terminal half of the A-T gene product which, together with the previously published C-terminal half, completes the sequence of the A-T protein. No homologies with other genes have been found within the N-terminal half of the A-T protein. We have also identified six mutations affecting the N-terminal half of the protein. One of these mutations was found to be associated with a haplotype that is common to four apparently unrelated families of Irish descent. All the patients so far examined for both A-T alleles were shown to be compound heterozygotes. None of these mutations affected a putative promoter region which may direct divergent transcription of both the A-T gene and a novel gene E14. The ability to recognise mutations across the entire coding sequence of the A-T gene provides a practical advantage to A-T families since a DNA based prenatal diagnosis will be possible in families where the mutations are identified irrespective of the level of radiosensitivity in these families.[1]


  1. Mutations revealed by sequencing the 5' half of the gene for ataxia telangiectasia. Byrd, P.J., McConville, C.M., Cooper, P., Parkhill, J., Stankovic, T., McGuire, G.M., Thick, J.A., Taylor, A.M. Hum. Mol. Genet. (1996) [Pubmed]
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