Evaluation of gene selection metrics for tumor cell classification

Genetics and Molecular Biology

Katti Faceli¹  André C.p.l.f. De Carvalho¹  Wilson A. Silva Jr² 

[1] ,Universidade de São Paulo Instituto de Ciências Matemáticas e de Computação São Carlos SP ,Brazil

关键词: gene selection;    machine learning;    gene expression;    sage;   

DOI  :  10.1590/S1415-47572004000400029

来源: SciELO

【 摘 要 】

Gene expression profiles contain the expression level of thousands of genes. Depending on the issue under investigation, this large amount of data makes analysis impractical. Thus, it is important to select subsets of relevant genes to work with. This paper investigates different metrics for gene selection. The metrics are evaluated based on their ability in selecting genes whose expression profile provides information to distinguish between tumor and normal tissues. This evaluation is made by constructing classifiers using the genes selected by each metric and then comparing the performance of these classifiers. The performance of the classifiers is evaluated using the error rate in the classification of new tissues. As the dataset has few tissue samples, the leave-one-out methodology was employed to guarantee more reliable results. The classifiers are generated using different machine learning algorithms. Support Vector Machines (SVMs) and the C4.5 algorithm are employed. The experiments are conduced employing SAGE data obtained from the NCBI web site. There are few analysis involving SAGE data in the literature. It was found that the best metric for the data and algorithms employed is the metric logistic.

【 授权许可】

CC BY   
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