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Related Experiment Videos

Bias in multipoint linkage analysis arising from map misspecification.

E W Daw1, E A Thompson, E M Wijsman

  • 1Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, Washington 98195-7720, USA. warwick@stat.washington.edu

Genetic Epidemiology
|December 7, 2000
PubMed
Summary
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Multipoint linkage analysis is powerful but sensitive to errors in genetic maps. Map inaccuracies can reduce the power to detect linkage and increase false positives, necessitating careful evaluation in human genetic studies.

Area of Science:

  • Human Genetics
  • Statistical Genetics
  • Bioinformatics

Background:

  • Multipoint linkage analysis is crucial for human genetic studies, offering increased power.
  • Current methods rely on accurate meiotic marker maps, which are often uncertain.
  • Recombination rates differ between sexes, yet sex-averaged maps are commonly used.

Purpose of the Study:

  • To systematically quantify lod score bias in multipoint linkage analysis.
  • To investigate bias arising from meiotic map misspecification (distance and sex differences).
  • To assess the impact of bias on linkage detection power and false-positive rates.

Main Methods:

  • Defined lod score bias as the expected difference between scores from true and misspecified maps.
  • Examined bias under conditions of actual linkage and absence of linkage.

Related Experiment Videos

  • Quantified bias resulting from uncertainties in meiotic distances and sex-averaged maps.

    • Main Results:

    • Map misspecification causes negative lod score bias, reducing linkage detection power.
    • Bias is generally modest unless both distance and sex misspecifications are substantial.
    • In the absence of linkage, misspecification can lead to positive or negative bias, potentially inflating false-positive rates.

    Conclusions:

    • Current sex-averaged maps are adequate for initial multipoint screening.
    • Potential bias from map misspecification requires evaluation when following up initial findings.
    • Accurate meiotic maps are essential for robust multipoint linkage analysis, especially with widespread diallelic marker use.