GENETIC EPIDEMIOLOGY OF ALZHEIMER'S DISEASE IN TWINS

双胞胎阿尔茨海默病的遗传流行病学

• 批准号: 6336051
• 负责人: BRENDA L PLASSMAN
• 金额: $ 1.61万
• 依托单位: DUKE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6336051
• 关键词: Alzheimer's disease; apolipoprotein E; clinical research; disease /disorder etiology; disease /disorder onset; disease /disorder proneness /risk; dizygotic twins; family genetics; gene environment interaction; genetic registry /resource /referral center; genetic susceptibility; human genetic material tag; human old age (65+); human subject; longitudinal human study; low density lipoprotein receptor; macroglobulins; male; monozygotic twins; patient /disease registry; statistics /biometry; twin /multiplet

DESCRIPTION: (Adapted from the Investigator's Abstract) The National Academy of Sciences/National Research Council Twin Registry ("the Registry") contains approximately 4,300 living pairs of white male twins who will be aged 72-83 in 2000. This competing renewal application proposes studies in the Registry that, combined with work to date, will yield 240 twin pairs in which one or both members have Alzheimer's disease (AD). This population-based panel will enable the continued investigation of four broad aims: 1) Estimate the magnitude of genetic influences on the development and age of onset of AD by contrasting concordance rates and the similarity of onsets within monozygotic (MZ) and dizygotic (DZ) pairs; 2) Characterize the environmental contribution of variability of onset of AD. For example, variability of onset within MZ pairs defines the maximum degree to which the environmental influences can modify the onset of AD; 3) Evaluate the role of specific genes on the development and age of onset of AD using the Sibling Transmission/Disequilibrium Test approach to investigate the association between candidate genes such as alpha-2 macroglobulin (A2M) and AD; and 4) Identify environmental factors that are associated with the risk of developing AD, using the co-twin control method. The research will capitalize upon recent developments in the genetics of AD, specifically the influence of apolipoprotein E (APOE) genotype and candidate gene A2M on both liability to AD and its timing of onset. Such findings can be used to refine the classical twin paradigm of investigating broad (but heterogeneous) genetic and environmental influences. Thus, one can not only estimate the heritability of AD in general, but also undertake partitioned analyses to estimate the phenotypic variance attributable to genotypes at APOE or other marker systems, as these are identified. However, until all of the genes that predispose to AD are identified, the twin method has several advantages over other approaches in identifying the extent of the genetic and environmental contribution to AD. Several MZ twin pairs have been described with widely divergent onsets of AD. Environmental factors may therefore alter the onset, and hence the populations risk, of some genetically defined forms of AD. This study will analyze the environmental contribution to variability of onset, and will characterize the divergence in onset within sets of genetically matched individuals. Since comprehensive information on environmental factors has been collected on all participating members of the twin registry, this study will also employ the co-twin control method to seek the specific environmental factors that may be responsible for this variation. A population-based twin design remains the ideal approach to these sorts of investigations.

描述：（改编自研究者摘要）美国国家科学院