Information-theoretic gene-gene and gene-environment interaction analysis of quantitative traits.

Abstract:

BACKGROUND:The purpose of this research was to develop a novel information theoretic method and an efficient algorithm for analyzing the gene-gene (GGI) and gene-environmental interactions (GEI) associated with quantitative traits (QT). The method is built on two information-theoretic metrics, the k-way interaction information (KWII) and phenotype-associated information (PAI). The PAI is a novel information theoretic metric that is obtained from the total information correlation (TCI) information theoretic metric by removing the contributions for inter-variable dependencies (resulting from factors such as linkage disequilibrium and common sources of environmental pollutants). RESULTS:The KWII and the PAI were critically evaluated and incorporated within an algorithm called CHORUS for analyzing QT. The combinations with the highest values of KWII and PAI identified each known GEI associated with the QT in the simulated data sets. The CHORUS algorithm was tested using the simulated GAW15 data set and two real GGI data sets from QTL mapping studies of high-density lipoprotein levels/atherosclerotic lesion size and ultra-violet light-induced immunosuppression. The KWII and PAI were found to have excellent sensitivity for identifying the key GEI simulated to affect the two quantitative trait variables in the GAW15 data set. In addition, both metrics showed strong concordance with the results of the two different QTL mapping data sets. CONCLUSION:The KWII and PAI are promising metrics for analyzing the GEI of QT.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Chanda P,Sucheston L,Liu S,Zhang A,Ramanathan M

doi

10.1186/1471-2164-10-509

subject

Has Abstract

pub_date

2009-11-04 00:00:00

pages

509

issn

1471-2164

pii

1471-2164-10-509

journal_volume

10

pub_type

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