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A Sibship Test for Linkage in the Presence of Association: The Sib Transmission/Disequilibrium Test

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Spielman, Richard S., Ewens, Warren J.·1998·The American Journal of Human Genetics

Abstract

Linkage analysis with genetic markers has been successful in the localization of genes for many monogenic human diseases. In studies of complex diseases, however, tests that rely on linkage disequilibrium (the simultaneous presence of linkage and association) are often more powerful than those that rely on linkage alone. This advantage is illustrated by the transmission/disequilibrium test (TDT). The TDT requires data (marker genotypes) for affected individuals and their parents; for some diseases, however, data from parents may be difficult or impossible to obtain. In this article, we describe a method, called the "sib TDT" (or "S-TDT"), that overcomes this problem by use of marker data from unaffected sibs instead of from parents, thus allowing application of the principle of the TDT to sibships without parental data. In a single collection of families, there might be some that can be analyzed only by the TDT and others that are suitable for analysis by the S-TDT. We show how all the data may be used jointly in one overall TDT-type procedure that tests for linkage in the presence of association. These extensions of the TDT will be valuable for the study of diseases of late onset, such as non-insulin-dependent diabetes, cardiovascular diseases, and other diseases associated with aging.

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Authors
Spielman, R. S., & Ewens, W. J.
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
1998-02
Volume
62
Issue
2
Pages
450-458
ISSN
0002-9297 (ISSN-L)
OpenAlex
W2169556112
Cited by
659
References
0
FWCI
32.81
Type
journal article
Language
en
Open access
hybrid

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