Journal Article

Bayesian robust analysis for genetic architecture of quantitative traits

Runqing Yang, Xin Wang, Jian Li and Hongwen Deng

in Bioinformatics

Volume 25, issue 8, pages 1033-1039
Published in print April 2009 | ISSN: 1367-4803
Published online October 2008 | e-ISSN: 1460-2059 | DOI:

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Motivation: In most quantitative trait locus (QTL) mapping studies, phenotypes are assumed to follow normal distributions. Deviations from this assumption may affect the accuracy of QTL detection and lead to detection of spurious QTLs. To improve the robustness of QTL mapping methods, we replaced the normal distribution for residuals in multiple interacting QTL models with the normal/independent distributions that are a class of symmetric and long-tailed distributions and are able to accommodate residual outliers. Subsequently, we developed a Bayesian robust analysis strategy for dissecting genetic architecture of quantitative traits and for mapping genome-wide interacting QTLs in line crosses.

Results: Through computer simulations, we showed that our strategy had a similar power for QTL detection compared with traditional methods assuming normal-distributed traits, but had a substantially increased power for non-normal phenotypes. When this strategy was applied to a group of traits associated with physical/chemical characteristics and quality in rice, more main and epistatic QTLs were detected than traditional Bayesian model analyses under the normal assumption.


Supplementary information: Supplementary data are available at Bioinformatics online.

Journal Article.  4876 words.  Illustrated.

Subjects: Bioinformatics and Computational Biology

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