Optimal DNA Signal Recognition Models with a Fixed Amount of Intrasignal Dependency 1st Edition by Brona Brejová, Daniel Brown, Tomáš Vinar 9783540200765

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ISBN 13: 9783540200765

Author: Brona Brejová, Daniel G. Brown; Tomáš Vinar

We study new probabilistic models for signals in DNA. Our models allow dependencies between multiple non-adjacent positions, in a generative model we call a higher-order tree. Computing the model of maximum likelihood is equivalent in our context to computing a minimum directed spanning hypergraph, a problem we show is NP-complete. We instead compute good models using simple greedy heuristics. In practice, the advantage of using our models over more standard models based on adjacent positions is modest. However, there is a notable improvement in the estimation of the probability that a given position is a signal, which is useful in the context of probabilistic gene finding. We also show that there is little improvement by incorporating multiple signals involved in gene structure into a composite signal model in our framework, though again this gives better estimation of the probability that a site is an acceptor site signal.

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