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Transmission-disequilibrium tests for quantitative traits

¹Obesity Research Center, Columbia University College of Physicians and Surgeons, New York, NY 10025, USA. dba8@columbia.edu

American Journal of Human Genetics

|March 1, 1997

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This study introduces five transmission-disequilibrium tests (TDT) for quantitative traits, extending the TDT

Area of Science:

Genetics
Biostatistics
Population Genetics

Background:

Family-based association studies are crucial for genetic research.
The transmission-disequilibrium test (TDT) is a powerful tool for dichotomous traits.
Existing TDT methods are not directly applicable to quantitative traits.

Purpose of the Study:

To develop and evaluate novel TDT-type tests for quantitative traits.
To assess the efficiency and power of these new tests compared to existing methods.
To explore the impact of sampling strategies on the power of TDT-type tests.

Main Methods:

Development of five TDT-type statistical tests for quantitative trait analysis.
Inclusion of methods for both unselected and extreme-phenotype offspring sampling.

Related Experiment Videos

Power calculations to compare the efficiency of new tests against sib-pair linkage tests.

Main Results:

The proposed TDT-type tests are significantly more efficient (at least an order of magnitude) than common sib-pair linkage tests for quantitative traits.
Sampling phenotypically extreme offspring substantially increases statistical power.
Quantitative trait loci explaining as little as 5% of phenotypic variation can be detected with fewer than 300 observations when extreme sampling is used.

Conclusions:

The developed TDT-type tests provide a powerful and efficient approach for genetic analysis of quantitative traits.
Extreme phenotypic sampling is a valuable strategy for enhancing the power of family-based association studies.
These methods facilitate the detection of quantitative trait loci with smaller effect sizes.