# Chevreul: an R bioconductor package for exploratory analysis of full-length single cell sequencing

## TL;DR

Chevreul is an R package and app that simplifies the analysis of full-length single-cell RNA sequencing data, making it accessible to researchers without programming experience.

## Contribution

Chevreul introduces an accessible, user-friendly tool for full-length scRNA-seq analysis with support for isoform-level and batch correction features.

## Key findings

- Chevreul supports exploratory analysis, including batch integration, normalization, and clustering.
- The package provides tools for isoform-level analysis and alternative splicing detection.
- The R Shiny app enables visualization of gene expression and differential expression results.

## Abstract

Chevreul is an open-source R Bioconductor package and interactive R Shiny app for processing and visualising single-cell RNA sequencing (scRNA-seq) data. Chevreul differs from other scRNA-seq analysis packages in its ease of use, capacity to analyze full-length RNA sequencing data for exon coverage and transcript isoform inference, and support for batch correction. Chevreul enables exploratory analyses of scRNA-seq data using Bioconductor SingleCellExperiment objects (or converted Seurat objects), including batch integration, quality control filtering, read count normalization and transformation, dimensionality reduction, clustering at a range of resolutions, and cluster marker gene identification. Processed data can be visualized in the R Shiny app. Gene or transcript expression can be visualized using PCA, tSNE, UMAP, heatmaps, or violin plots; differential expression can be evaluated with several statistical tests. Chevreul also provides accessible tools for isoform-level analyses and alternative splicing detection. Chevreul empowers researchers without programming experience to analyze full-length scRNA-seq data.

Chevreul is implemented in R, and the R package and integrated Shiny application are freely available at https://github.com/cobriniklab/chevreul with constituent packages hosted on Bioconductor at https://bioconductor.org/packages/chevreulProcess, https://bioconductor.org/packages/chevreulPlot, and https://bioconductor.org/packages/chevreulShiny.