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Plos Computational Biology : Protein Molecular Function Prediction by Bayesian Phylogenomics, Volume 1

By Eisen, Jonathan

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Book Id: WPLBN0003922024
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Computational Biology : Protein Molecular Function Prediction by Bayesian Phylogenomics, Volume 1  
Author: Eisen, Jonathan
Volume: Volume 1
Language: English
Subject: Journals, Science, Computational Biology
Collections: Periodicals: Journal and Magazine Collection, PLoS Computational Biology
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Publisher: Plos

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Eisen, J. (n.d.). Plos Computational Biology : Protein Molecular Function Prediction by Bayesian Phylogenomics, Volume 1. Retrieved from http://www.nationalpubliclibrary.info/


Description
Description : We present a statistical graphical model to infer specific molecular function for unannotated protein sequences using homology. Based on phylogenomic principles, SIFTER (Statistical Inference of Function Through Evolutionary Relationships) accurately predicts molecular function for members of a protein family given a reconciled phylogeny and available function annotations, even when the data are sparse or noisy. Our method produced specific and consistent molecular function predictions across 100 Pfam families in comparison to the Gene Ontology annotation database, BLAST, GOtcha, and Orthostrapper. We performed a more detailed exploration of functional predictions on the adenosine-59-monophosphate/adenosine deaminase family and the lactate/malate dehydrogenase family, in the former case comparing the predictions against a gold standard set of published functional characterizations. Given function annotations for 3% of the proteins in the deaminase family, SIFTER achieves 96% accuracy in predicting molecular function for experimentally characterized proteins as reported in the literature. The accuracy of SIFTER on this dataset is a significant improvement over other currently available methods such as BLAST (75%), GeneQuiz (64%), GOtcha (89%), and Orthostrapper (11%). We also experimentally characterized the adenosine deaminase from Plasmodium falciparum, confirming SIFTER’s prediction. The results illustrate the predictive power of exploiting a statistical model of function evolution in phylogenomic problems. A software implementation of SIFTER is available from the authors.

 

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