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bioRxiv · 10.1101/856401

ACTOR: a latent Dirichlet model to compare expressed isoform proportions to a reference panel

McCabe, S. D.·Nobel, A. B.·Love, M. I.
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Abstract

The relative proportion of RNA isoforms expressed for a given gene has been associated with disease states in cancer, retinal diseases, and neurological disorders. Examination of relative isoform proportions can help determine biological mechanisms, but such analyses often require a per-gene investigation of splicing patterns. Leveraging large public datasets produced by genomic consortia as a reference, one can compare splicing patterns in a dataset of interest with those of a reference panel in which samples are divided into distinct groups (tissue of origin, disease status, etc). We propose ACTOR, a latent Dirichlet model with Dirichlet Multinomial observations to compare expressed isoform proportions in a dataset to an independent reference panel. We use a variational Bayes procedure to estimate posterior distributions for the group membership of one or more samples. Using the Genotype-Tissue Expression (GTEx) project as a reference dataset, we evaluate ACTOR on simulated and real RNA-seq datasets to determine tissue-type classifications of genes. ACTOR is publicly available as an R package at https://github.com/mccabes292/actor.

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McCabe, S. D., Nobel, A. B., Love, M. I.. 2019-11-26. ACTOR: a latent Dirichlet model to compare expressed isoform proportions to a reference panel. https://doi.org/10.1101/856401

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