Correcting the mean-variance dependency for differential variability testing using single-cell RNA sequencing data

Nils Eling, Arianne C. Richard, Sylvia Richardson, John C Marioni, Catalina A. Vallejos

Research output: Contribution to journalArticlepeer-review

Abstract

Cell-to-cell transcriptional variability in otherwise homogeneous cell populations plays an important role in tissue function and development. Single-cell RNA sequencing can characterize this variability in a transcriptome-wide manner. However, technical variation and the confounding between variability and mean expression estimates hinder meaningful comparison of expression variability between cell populations. To address this problem, we introduce an analysis approach that extends the BASiCS statistical framework to derive a residual measure of variability that is not confounded by mean expression. This includes a robust procedure for quantifying technical noise in experiments where technical spike-in molecules are not available. We illustrate how our method provides biological insight into the dynamics of cell-to-cell expression variability, highlighting a synchronization of biosynthetic machinery components in immune cells upon activation. In contrast to the uniform up-regulation of the biosynthetic machinery, CD4+ T cells show heterogeneous up-regulation of immune-related and lineage-defining genes during activation and differentiation.
Original languageEnglish
Pages (from-to)284-294.e12
Number of pages23
JournalCell Systems
Volume7
Issue number3
Early online date29 Aug 2018
DOIs
Publication statusPublished - 26 Sep 2018

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