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Template-Based Models for Genome-Wide Analysis of Next-Generation Sequencing Data at Base-Pair Resolution

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  • Alexander W. Blocker
  • Edoardo M. Airoldi

Abstract

We consider the problem of estimating the genome-wide distribution of nucleosome positions from paired-end sequencing data. We develop a modeling approach based on nonparametric templates to control for the variability along the sequence of read counts associated with nucleosomal DNA due to enzymatic digestion and other sample preparation steps, and we develop a calibrated Bayesian method to detect local concentrations of nucleosome positions. We also introduce a set of estimands that provides rich, interpretable summaries of nucleosome positioning. Inference is carried out via a distributed Hamiltonian Monte Carlo algorithm that can scale linearly with the length of the genome being analyzed. We provide MPI-based Python implementations of the proposed methods, stand-alone and on Amazon EC2, which can provide inferences on an entire Saccharomyces cerevisiae genome in less than 1 hr on EC2. We evaluate the accuracy and reproducibility of the inferences leveraging a factorially designed simulation study and experimental replicates. The template-based approach we develop here is also applicable to single-end sequencing data by using alternative sources of fragment length information, and to ordered and sequential data more generally. It provides a flexible and scalable alternative to mixture models, hidden Markov models, and Parzen-window methods. Supplementary materials for this article are available online.

Suggested Citation

  • Alexander W. Blocker & Edoardo M. Airoldi, 2016. "Template-Based Models for Genome-Wide Analysis of Next-Generation Sequencing Data at Base-Pair Resolution," Journal of the American Statistical Association, Taylor & Francis Journals, vol. 111(515), pages 967-987, July.
    • Handle: RePEc:taf:jnlasa:v:111:y:2016:i:515:p:967-987
    DOI: 10.1080/01621459.2016.1141095
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    References listed on IDEAS

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    1. Istvan Albert & Travis N. Mavrich & Lynn P. Tomsho & Ji Qi & Sara J. Zanton & Stephan C. Schuster & B. Franklin Pugh, 2007. "Translational and rotational settings of H2A.Z nucleosomes across the Saccharomyces cerevisiae genome," Nature, Nature, vol. 446(7135), pages 572-576, March.
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    4. Mayetri Gupta, 2007. "Generalized Hierarchical Markov Models for the Discovery of Length-Constrained Sequence Features from Genome Tiling Arrays," Biometrics, The International Biometric Society, vol. 63(3), pages 797-805, September.
    5. Eran Segal & Yvonne Fondufe-Mittendorf & Lingyi Chen & AnnChristine Thåström & Yair Field & Irene K. Moore & Ji-Ping Z. Wang & Jonathan Widom, 2006. "A genomic code for nucleosome positioning," Nature, Nature, vol. 442(7104), pages 772-778, August.
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