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Related Experiment Videos

A brute force dichotomization approach to quantitative trait linkage analysis

J N Bailey1, L Almasy

  • 1Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT 06510, USA.

Genetic Epidemiology
|January 1, 1995
PubMed
Summary

Dichotomizing a continuous phenotype for linkage analysis can still detect genetic loci, even those explaining only 16% of disease variance. This approach remains viable for oligogenic traits, with covariates and quantitative trait analysis also considered.

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Area of Science:

  • Genetics
  • Statistical genetics
  • Bioinformatics

Background:

  • Linkage analysis is crucial for identifying genes associated with diseases.
  • Dichotomizing continuous traits simplifies analysis but may lead to information loss.
  • Oligogenic traits involve a small number of genes influencing a phenotype.

Purpose of the Study:

  • To investigate the impact of dichotomizing a continuous phenotype on linkage analysis for simulated oligogenic traits.
  • To determine if dichotomization hinders the detection of genetic loci with moderate effects.
  • To explore the influence of covariates and quantitative trait linkage analysis.

Main Methods:

  • Simulated data for an oligogenic trait with a continuous phenotype.
  • Application of linkage analysis techniques to both dichotomized and continuous phenotypes.

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  • Inclusion and evaluation of known covariates in the analysis.
  • Comparison of results from dichotomized trait analysis versus quantitative trait linkage analysis.

    • Main Results:

    • Dichotomization of a continuous phenotype does not inherently prevent the detection of quantitative trait loci (QTLs).
    • Genetic loci explaining as little as 16% of the genetic variance were successfully detected despite dichotomization.
    • The inclusion of known covariates can improve the power of linkage analysis.
    • Quantitative trait linkage analysis generally offers higher power than dichotomized analysis.

    Conclusions:

    • Dichotomizing a continuous phenotype is a feasible approach in linkage analysis for oligogenic traits, even for loci with moderate genetic contributions.
    • Researchers should consider the potential information loss but recognize that detection is still possible.
    • Incorporating covariates and employing quantitative trait linkage analysis are recommended strategies to enhance the power and accuracy of genetic analyses.