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Heterogeneity testing for Alzheimer's disease within and between data sets

L L Miller1, L M Ploughman, M L Marazita

  • 1Department of Human Genetics, Medical College of Virginia, Virginia Commonwealth University, Richmond 23298-003.

Genetic Epidemiology
|January 1, 1993
PubMed
Summary

This study investigated Alzheimer's disease (AD) genetic markers across three family datasets. While initial tests found no heterogeneity within datasets, further analysis suggested potential heterogeneity for the BCL3 marker between families.

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Area of Science:

  • Genetics
  • Neuroscience
  • Biostatistics

Background:

  • Alzheimer's disease (AD) is a complex neurodegenerative disorder with a suspected genetic component.
  • Understanding genetic heterogeneity is crucial for accurate linkage analysis in AD family studies.

Purpose of the Study:

  • To assess genetic heterogeneity among three Alzheimer's disease (AD) family datasets.
  • To identify specific genetic markers linked to AD on chromosomes 19 and 21.

Main Methods:

  • Analysis of four genetic markers (BCL3/EcoR-Mlu, D19S13/TaqI, D21S13/TaqI, D21S16/XbaI) across three AD family datasets.
  • Application of homogeneity tests including Morton's pre-divided samples test (PS-test), Smith's admixture test (A-test), and MacLean's C-test to evaluate linkage and heterogeneity.
  • Statistical analysis to determine evidence of linkage and heterogeneity.

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Main Results:

  • Significant evidence of linkage to AD was observed for markers BCL3, D19S13, and D21S16 in the Duke dataset, and D19S13 and D21S16 in the Boston dataset, assuming homogeneity.
  • C-tests indicated linkage for BCL3 and D21S13 (Duke) and D21S16 (Boston).
  • No evidence of within-dataset heterogeneity was found using A-tests or C-tests for any marker; however, PS-tests suggested heterogeneity for the BCL3 marker between datasets and between early- and late-onset families.

Conclusions:

  • While linkage to specific markers was identified, the presence of heterogeneity, particularly for the BCL3 marker, complicates interpretation.
  • Further investigation is needed to fully understand the role of genetic heterogeneity in Alzheimer's disease.
  • The findings highlight the importance of considering heterogeneity in genetic studies of complex diseases like AD.