Welcome to The Home of LeFEMiner: The Learner of Functional Enrichment
LeFEMiner, based on the LeFE algorithm, is a novel tool, for the interpretation of gene microarray data. LeFEMiner applies a random forest machine learning algorithm in conjunction with a permutation based statistical method to determine which sets of functionally related genes (ie. gene categories or ensembles) are most biologically related to the observed biology or state of the samples. LeFEMiner differs from the previously published methods because it embraces the complexity of non-linear and multifactor gene regulation with flexible machine learning models. Applications of LeFEMiner to well studied datasets produce meaningful results that are either consistent with previously demonstrated biology phenomina or represent plausibly novel findings .
How do I get LeFEMiner?
The code required to run LeFFMiner is available for download here. It is recommended that users of the LeFEMiner software have access to a multiprocessor instance of R as this will facilitate faster calculation of the results. However, if you do not have a multiprocessed insance of R, LeFEMiner will still operate, just slower.
What's the output of LeFEMiner?
LeFE ranks the analyzed gene categories by their likelihood of association with the experiments' high-level phenotypes descriptions. The statistical significance of the results is assessed by reperforming the same operation several times on a dataset in which the experiments' phenotypes have been permuted. The Example Output Tab shows precomputed results of LeFE applied to a dataset comparing p53 mutants verses wildtype cell lines.
How does it work?
Briefly, LeFE takes a gene expression matrix and a set of annotations or signatures of each sample. For example, your microarrays may contain gene expression profiles of tumors and adjacent normal tissue. Your signatures will then be two classes of data, N and T for normal and tumor. LeFE then determines which functionally related genes ensembles are most associated with the higher-level sample annotations. The ensembles are defined as genes from the same Gene Ontology category or other independent predefined ensembles.
For a graphical overview of how LeFE works, please see the ‘How It Works’ section of the website. A more technical overview can be found in the forthcoming manuscript in Genome Biology.
LeFE's citation is as follows: Eichler GS, Reimers M, Kane D, Weinstein JN, "The LeFE algorithm: embracing the complexity of gene expression in the interpretation of microarray data.", Genome Biology, 2007 Sep 10;8(9):R187
LeFE™ is a development of the Genomics and Bioinformatics Group, Laboratory of Molecular Pharmacology (LMP), Center for Cancer Research (CCR), National Cancer Institute (NCI). Please email us with any problems, questions or feedback on the tool.