Medical College of Wisconsin
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Multivariate approach for selecting sets of differentially expressed genes. Math Biosci 2002 Mar;176(1):59-69 PMID: 11867084

Pubmed ID



An important problem addressed using cDNA microarray data is the detection of genes differentially expressed in two tissues of interest. Currently used approaches ignore the multidimensional structure of the data. However it is well known that correlation among covariates can enhance the ability to detect less pronounced differences. We use the Mahalanobis distance between vectors of gene expressions as a criterion for simultaneously comparing a set of genes and develop an algorithm for maximizing it. To overcome the problem of instability of covariance matrices we propose a new method of combining data from small-scale random search experiments. We show that by utilizing the correlation structure the multivariate method, in addition to the genes found by the one-dimensional criteria, finds genes whose differential expression is not detectable marginally.

Author List

Chilingaryan A, Gevorgyan N, Vardanyan A, Jones D, Szabo A


Aniko Szabo PhD Associate Professor in the Institute for Health and Equity department at Medical College of Wisconsin


2-s2.0-0036126862   29 Citations

MESH terms used to index this publication - Major topics in bold

Computer Simulation
Gene Expression Profiling
HT29 Cells
Multivariate Analysis
Oligonucleotide Array Sequence Analysis
jenkins-FCD Prod-299 9ef562391eceb2b8f95265c767fbba1ce5a52fd6