Journal
AMERICAN JOURNAL OF HUMAN GENETICS
Volume 75, Issue 3, Pages 398-409Publisher
CELL PRESS
DOI: 10.1086/423393
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Funding
- NIA NIH HHS [AG 08017, AG 05136, AG 21544, R37 AG011762, R01 AG021544, P30 AG008017, AG 11762, R01 AG011762, P50 AG005136, U24 AG021886] Funding Source: Medline
- NIGMS NIH HHS [R37 GM046255, R01 GM046255, GM 46255] Funding Source: Medline
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Late-onset familial Alzheimer disease (LOFAD) is a genetically heterogeneous and complex disease for which only one locus, APOE, has been definitively identified. Difficulties in identifying additional loci are likely to stem from inadequate linkage analysis methods. Nonparametric methods suffer from low power because of limited use of the data, and traditional parametric methods suffer from limitations in the complexity of the genetic model that can be feasibly used in analysis. Alternative methods that have recently been developed include Bayesian Markov chain Monte Carlo methods. These methods allow multipoint linkage analysis under oligogenic trait models in pedigrees of arbitrary size; at the same time, they allow for inclusion of covariates in the analysis. We applied this approach to an analysis of LOFAD on five chromosomes with previous reports of linkage. We identified strong evidence of a second LOFAD gene on chromosome 19p13.2, which is distinct from APOE on 19q. We also obtained weak evidence of linkage to chromosome 10 at the same location as a previous report of linkage but found no evidence for linkage of LOFAD age-at-onset loci to chromosomes 9, 12, or 21.
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