Identifying atypically expressed chromosome regions using RNA-Seq data

Vinícius Diniz Mayrink () and Flávio B. Gonçalves
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Vinícius Diniz Mayrink: ICEx Universidade Federal de Minas Gerais, Av. Antônio Carlos
Flávio B. Gonçalves: ICEx Universidade Federal de Minas Gerais, Av. Antônio Carlos

Statistical Methods & Applications, 2020, vol. 29, issue 3, No 9, 619-649

Abstract: Abstract The number of studies dealing with RNA-Seq data analysis has experienced a fast increase in the past years making this type of gene expression a strong competitor to the DNA microarrays. This paper proposes a Bayesian model to detect low and highly-expressed chromosome regions using RNA-Seq data. The methodology is based on a recent work designed to detect highly-expressed (overexpressed) regions in the context of microarray data. A hidden Markov model is developed by considering a mixture of Gaussian distributions with ordered means in a way that first and last mixture components are supposed to accommodate the under and overexpressed genes, respectively. The model is flexible enough to efficiently deal with the highly irregular spaced configuration of the data by assuming a hierarchical Markov dependence structure. The analysis of four cancer data sets (breast, lung, ovarian and uterus) is presented. Results indicate that the proposed model is selective in determining the expression status, robust with respect to prior specifications and provides tools for a global or local search of under and overexpressed chromosome regions.

Keywords: Bayesian inference; Mixture model; Gibbs sampling; Gene expression; Cancer (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s10260-019-00496-4

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