Package: brie
BRIE: Bayesian Regression for Isoform EstimateTop News[29/05/2022] We have released v2.2 that fully supports counting droplet-based
data for both Skipping Exon events and other types of splcing events. See thebrie-count manual[29/05/2022] We have include small-sized test data sets (15MB) for both
smart-seq2 and 10x Genomics. See data inbrie-tutorials/tests repoAbout BRIEWelcome to the new BRIE (>=2.0 or BRIE2), Bayesian Regression for Isoform
Estimate, a scalable Bayesian method to accurately identify splicing phenotypes
in single-cell RNA-seq experiments and quantify isoform proportions and their
uncertainty.BRIE2 supports the analysis of splicing processes at two molecular levels,
either between alternative splicing isoforms or between unspliced and spliced
RNAs. In either case, it returns cell-by-event or cell-by-gene matrices of PSI
value and its 95% confidence interval (quantification) and the statistics for
detecting DAS and DMG on each event or gene:Differential alternative splicing (DAS):This task is to quantify the
proportions of alternative splicing isoforms and to detect DAS between groups
of cells or along with a continuous covariate, e.g., pseudotime.
BRIE2 is designed for two-isoform splicing events with a focus on exon
skipping, but in principle also applicable for mutual exclusion,
intron-retaining, alternative poly-A site, 3’ splice site and 5’ splice site.Differential momentum genes (DMG):This task is to quantify the
proportions of unspliced and spliced RNAs in each gene and each cell.
Similar to DAS, the DMG is a principled selection of genes that capture
heterogeneity in transcriptional kinetics between cell groups, e.g., cell
types, or continuous cell covariates, hence may enhance the RNA velocity
analyses by focusing on dynamics informed genes.InstallationBRIE2 is available throughPyPI. To install, type the following command
line, and add-Ufor upgrading:pipinstall-UbrieAlternatively, you can install from this GitHub repository for the latest (often
development) version with the following command linepipinstall-Ugit+https://github.com/huangyh09/brieIn either case, add--userif you don’t have the write permission for your
Python environment.For more instructions, see theinstallationmanual.Manual and examplesThe full manual is athttps://brie.readthedocs.ioMore examples and tutorials:https://github.com/huangyh09/brie-tutorialsIn short, there are two steps for running BRIE2.
First, obtain cell-by-gene or cell-by-event count matrices for each isoform.
For the exon-skipping event, you can runbrie-count, which will return count
matrices and hdf5 file for AnnData.
For spliced and unspliced matrices, we listed a few options in themanual.Then you can usebrie-quantto perform quantification of splicing ratio and
detect differential alternative splicing or differential momentum genes.Type command linebrie-count-handbrie-quant-hto see the full
arguments.ReferencesYuanhua Huang and Guido Sanguinetti.BRIE2: computational identification of
splicing phenotypes from single-cell transcriptomic experiments.Genome Biology, 2021; 22(1):251.Yuanhua Huang and Guido Sanguinetti.BRIE: transcriptome-wide splicing
quantification in single cells.Genome Biology, 2017; 18(1):123.