Differential co-expression framework to quantify goodness of biclusters and compare biclustering algorithms

被引:15
作者
Chia, Burton Kuan Hui [2 ]
Karuturi, R. Krishna Murthy [1 ]
机构
[1] ASTAR, Genome Inst Singapore, Singapore, Singapore
[2] Natl Univ Singapore, Sch Comp, Singapore 117548, Singapore
关键词
EXPRESSION; PREDICTION; CANCER;
D O I
10.1186/1748-7188-5-23
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Background: Biclustering is an important analysis procedure to understand the biological mechanisms from microarray gene expression data. Several algorithms have been proposed to identify biclusters, but very little effort was made to compare the performance of different algorithms on real datasets and combine the resultant biclusters into one unified ranking. Results: In this paper we propose differential co-expression framework and a differential co-expression scoring function to objectively quantify quality or goodness of a bicluster of genes based on the observation that genes in a bicluster are co-expressed in the conditions belonged to the bicluster and not co-expressed in the other conditions. Furthermore, we propose a scoring function to stratify biclusters into three types of co-expression. We used the proposed scoring functions to understand the performance and behavior of the four well established biclustering algorithms on six real datasets from different domains by combining their output into one unified ranking. Conclusions: Differential co-expression framework is useful to provide quantitative and objective assessment of the goodness of biclusters of co-expressed genes and performance of biclustering algorithms in identifying co-expression biclusters. It also helps to combine the biclusters output by different algorithms into one unified ranking i.e. meta-biclustering.
引用
收藏
页数:12
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