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Enhanced Regulatory Sequence Prediction Using Gapped k-mer Features

Identifieur interne : 001C66 ( Main/Exploration ); précédent : 001C65; suivant : 001C67

Enhanced Regulatory Sequence Prediction Using Gapped k-mer Features

Auteurs : Mahmoud Ghandi [États-Unis] ; Dongwon Lee [États-Unis] ; Morteza Mohammad-Noori [Iran] ; Michael A. Beer [États-Unis]

Source :

RBID : PMC:4102394

Descripteurs français

English descriptors

Abstract

Abstract

Oligomers of length k, or k-mers, are convenient and widely used features for modeling the properties and functions of DNA and protein sequences. However, k-mers suffer from the inherent limitation that if the parameter k is increased to resolve longer features, the probability of observing any specific k-mer becomes very small, and k-mer counts approach a binary variable, with most k-mers absent and a few present once. Thus, any statistical learning approach using k-mers as features becomes susceptible to noisy training set k-mer frequencies once k becomes large. To address this problem, we introduce alternative feature sets using gapped k-mers, a new classifier, gkm-SVM, and a general method for robust estimation of k-mer frequencies. To make the method applicable to large-scale genome wide applications, we develop an efficient tree data structure for computing the kernel matrix. We show that compared to our original kmer-SVM and alternative approaches, our gkm-SVM predicts functional genomic regulatory elements and tissue specific enhancers with significantly improved accuracy, increasing the precision by up to a factor of two. We then show that gkm-SVM consistently outperforms kmer-SVM on human ENCODE ChIP-seq datasets, and further demonstrate the general utility of our method using a Naïve-Bayes classifier. Although developed for regulatory sequence analysis, these methods can be applied to any sequence classification problem.


Url:
DOI: 10.1371/journal.pcbi.1003711
PubMed: 25033408
PubMed Central: 4102394


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<title>Abstract</title>
<p>Oligomers of length
<italic>k</italic>
, or
<italic>k</italic>
-mers, are convenient and widely used features for modeling the properties and functions of DNA and protein sequences. However,
<italic>k</italic>
-mers suffer from the inherent limitation that if the parameter
<italic>k</italic>
is increased to resolve longer features, the probability of observing any specific
<italic>k</italic>
-mer becomes very small, and
<italic>k-</italic>
mer counts approach a binary variable, with most
<italic>k</italic>
-mers absent and a few present once. Thus, any statistical learning approach using
<italic>k</italic>
-mers as features becomes susceptible to noisy training set
<italic>k</italic>
-mer frequencies once
<italic>k</italic>
becomes large. To address this problem, we introduce alternative feature sets using gapped
<italic>k</italic>
-mers, a new classifier, gkm-SVM, and a general method for robust estimation of
<italic>k</italic>
-mer frequencies. To make the method applicable to large-scale genome wide applications, we develop an efficient tree data structure for computing the kernel matrix. We show that compared to our original kmer-SVM and alternative approaches, our gkm-SVM predicts functional genomic regulatory elements and tissue specific enhancers with significantly improved accuracy, increasing the precision by up to a factor of two. We then show that gkm-SVM consistently outperforms kmer-SVM on human ENCODE ChIP-seq datasets, and further demonstrate the general utility of our method using a Naïve-Bayes classifier. Although developed for regulatory sequence analysis, these methods can be applied to any sequence classification problem.</p>
</div>
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<list>
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<li>États-Unis</li>
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<li>Maryland</li>
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<name sortKey="Beer, Michael A" sort="Beer, Michael A" uniqKey="Beer M" first="Michael A." last="Beer">Michael A. Beer</name>
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</record>

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