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Substantial linkage disequilibrium across the insulin-degrading enzyme locus but no association with late-onset Alzheimer's disease

Abraham, Richard, Myers, Amanda, Wavrant-DeVrieze, Fabienne, Hamshere, Marian Lindsay ORCID:, Thomas, Hollie Victoria, Marshall, Helen, Compton, Danielle, Spurlock, Gillian, Turic, Dragana, Hoogendoorn, Bastiaan ORCID:, Kwon, Jennifer M., Petersen, Ronald C., Tangalos, Eric, Norton, Joanne, Morris, John C., Bullock, Roger, Liolitsa, Danae, Lovestone, Simon, Hardy, John, Goate, Alison, O'Donovan, Michael Conlon ORCID:, Williams, Julie ORCID:, Owen, Michael John ORCID: and Jones, Lesley ORCID: 2001. Substantial linkage disequilibrium across the insulin-degrading enzyme locus but no association with late-onset Alzheimer's disease. Human Genetics 109 (6) , pp. 646-652. 10.1007/s00439-001-0614-1

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Insulin-degrading enzyme (IDE; insulysin; EC is a 110-kDa neutral metallopeptidase that can degrade a number of peptides including beta-amyloid. The gene encoding IDE is located on chromosome 10 close to a region of linkage for late-onset Alzheimer's disease (LOAD) and thus is a functional and positional candidate for this disorder. We analysed all of the coding exons, untranslated regions and 1000 bp of 5'-flanking sequence of IDE by using denaturing high-performance liquid chromatography and sequencing. We detected eight single nucleotide polymorphisms (SNPs), three in the 5' flanking sequence and five in the coding sequence, of which three were found at lower than 5% frequency. None of them changed the amino acid sequence. We genotyped the five SNPs with allele frequencies of more than 5% in 133 Caucasian LOAD cases and 135 controls collected in the UK and 95 cases and 117 controls collected at the Mayo Clinic, Rochester, USA. Two of the SNPs were analysed in a further independent case-control sample (Washington University, St. Louis: 86 cases, 94 controls). No significant association was found with any individual SNP in any of the samples or with any haplotypes. Analysis of the marker D10S583, which maps 36 kb upstream of IDE, also failed to show association in 134 cases and 111 matched controls from the UK ( P=0.63). Strong linkage disequilibrium was detected between the five SNPs that spanned the whole of the 120-kb genomic region of IDE and one major and a number of minor haplotypes were detected in the populations studied. We conclude that IDE does not make a substantial contribution to the aetiology of LOAD and therefore cannot account for the linkage between LOAD and 10q.

Item Type: Article
Date Type: Publication
Status: Published
Schools: MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG)
Neuroscience and Mental Health Research Institute (NMHRI)
Subjects: R Medicine > R Medicine (General)
Publisher: Springer
ISSN: 0340-6717
Last Modified: 04 Mar 2023 03:02

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