by Michael Brown, Richard Hughey, Anders Krogh, I. Saira Mian, Sinsheimer Laboratories, Kimmen Sjolander, David Haussler
Proceedings of the Third International Conference on Intelligent Systems for Molecular Biology
http://alpha-bits.ai.mit.edu/people/mpf/homedir/files/limbo/levels/level1/research/Mol.Bio./HMM-protein/ismb93.ps
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Abstract:
A Bayesian method for estimating the amino acid distributions in the states of a hidden Markov model (HMM) for a protein family or the columns of a multiple alignment of that family is introduced. This method uses Dirichlet mixture densities as priors over amino acid distributions. These mixture densities are determined from examination of previously constructed HMMs or multiple alignments. It is shown that this Bayesian method can improve the quality of HMMs produced from small training sets. Specific experiments on the EF-hand motif are reported, for which these priors are shown to produce HMMs with higher likelihood on unseen data, and fewer false positives and false negatives in a database search task.
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