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Bayesian Unsupervis...
Bayesian Unsupervised Learning of DNA Regulatory Binding Regions
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- Corander, Jukka (författare)
- University of Helsinki,Department of mathematics and statistics
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- Ekdhal, Magnus (författare)
- Swedbank
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- Koski, Timo, 1952- (författare)
- KTH,Matematisk statistik,computational biostatistics
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(creator_code:org_t)
- Hindawi Publishing Corporation, 2009
- 2009
- Engelska.
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Ingår i: Advances in Artificial Intelligence. - : Hindawi Publishing Corporation. - 1687-7470 .- 1687-7489. ; , s. 219743-
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Abstract
Ämnesord
Stäng
- Identification of regulatory binding motifs, that is, short specific words, within DNA sequences is a commonly occurring problem in computational bioinformatics. A wide variety of probabilistic approaches have been proposed in the literature to either scan for previously known motif types or to attempt de novo identification of a fixed number (typically one) of putative motifs. Mostapproaches assume the existence of reliable biodatabase information to build probabilistic a priori description of the motif classes. Examples of attempts to do probabilistic unsupervised learning about the number of putative de novo motif types and theirpositions within a set of DNA sequences are very rare in the literature. Here we show how such a learning problem can be formulated using a Bayesian model that targets to simultaneously maximize the marginal likelihood of sequence data arising under multiple motif types as well as under the background DNA model, which equals a variable length Markov chain. It is demonstrated how the adopted Bayesian modelling strategy combined with recently introduced nonstandard stochastic computation tools yields a more tractable learning procedure than is possible with the standard Monte Carlo approaches. Improvements and extensions of the proposed approach are also discussed.
Ämnesord
- NATURVETENSKAP -- Data- och informationsvetenskap (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences (hsv//eng)
Nyckelord
- Identification of regulatory binding motifs
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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