CORRESPONDENCE
Reply to Dr Raux et al.: Molecular diagnosis of autosomal dominant early onset Alzheimers disease: an update (J Med Genet 2005;42:7935)
Cognitive Function Clinic, Walton Centre for Neurology and Neurosurgery, Liverpool, UK
Correspondence to:
Correspondence to:
Dr A J Larner
Cognitive Function Clinic, Walton Centre for Neurology and Neurosurgery, Lower Lane, Fazakerley, Liverpoo, L9 7LJ, UK; a.larner@thewaltoncentre.nhs.uk
Revised version received 7 December 2005
Accepted 7 December 2005
Keywords: Alzheimers disease; presenilin-1
| The first 150 words of the full text of this article appear below. |
In their recent article, Dr Raux and colleagues1 report eight new presenilin-1 (PSEN1) mutations in autosomal dominant early onset Alzheimers disease (AD), four of which are said to be at codons not previously reported as mutant in AD (codons 214, 386, 391, and 424).
In our review of PSEN1 mutations,2 we identified a previous report from Poland3 of a mutation (L424R) at codon 424, with earlier age at onset (3035 years) than in the French pedigree (3842 years). Of the novel mutations at codons previously reported mutant in AD (codons 105, 116, 143, and 206),1 two (T116I and G206S) produce predicted amino acid substitutions already reported. In an Italian patient with the T116I mutation, with age at onset of 45 years, there was no family history of AD and this was thought to represent a de novo mutation.4 The G206S mutation has been reported but without clinical details.5
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