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TraCeR
A computational method to reconstruct full-length, paired T cell receptor (TCR) sequences from T lymphocyte single-cell RNA sequence data. TraCeR links T cell specificity with functional response by revealing clonal relationships between cells alongside their transcriptional profiles. TraCeR extracts TCR-derived sequencing reads for each cell by alignment against ‘combinatorial recombinomes’ comprising all possible combinations of V and J segments. Reads are then assembled into contiguous sequences that are analyzed to find full-length, recombined TCR sequences. Importantly, the reconstructed recombinant sequences typically contain nearly the complete length of the TCR V(D)J region and so allow high-confidence discrimination between closely related gene segments. Our method is sensitive, accurate and easy to adapt to any species for which annotated TCR gene sequences are available.
UMIS / Unique Molecular IdentifierS
Provides a way of removing amplification biases, the assumed absolute quantification does not appear to hold true perfectly. Umis is a flexible tool for counting the number of unique molecular identifiers. There are four steps in this method: (i) formatting reads, (ii) filtering noisy cellular barcodes, (iii) pseudo-mapping to cDNAs, and (iv) counting molecular identifiers. The quantitation used in umis handles reads that could come from multiple transcripts by assigning a fractional count to each transcript and then filtering for a minimum count at the end.
CEL-Seq
CEL-Seq provides its first single-cell, on-chip barcoding method, and we detected gene expression changes accompanying the progression through the cell cycle in mouse fibroblast cells. The pipeline consists of the following steps: (1) demultiplexing: using the barcode from R1 we split R2 reads into their original samples creating a separate file for each sample. Since the unique molecular identifier (UMI) is also read in R1 we extract it and attach it to the R2 read metadata for downstream analysis; (2) mapping: using Bowtie2, we map the reads of the different samples in parallel, cutting the analysis time by roughly the number of available cores; (3) read counting: A modified version of the htseq-count script that supports the identification and elimination of reads sharing the same UMI to generate an accurate molecule count for each feature. We use binomial statistics to convert the number of UMIs into transcript counts. The different steps in the pipeline are wrapped together in a single program with a simple configuration file allowing to control for different run modes.
AltAnalyze
An easy-to-use application for microarray, RNA-Seq and metabolomics analysis. For splicing sensitive platforms (RNA-Seq or Affymetrix Exon, Gene and Junction arrays), AltAnalyze will assess alternative exon (known and novel) expression along protein isoforms, domain composition and microRNA targeting. In addition to splicing-sensitive platforms, AltAnalyze provides comprehensive methods for the analysis of other data (RMA summarization, batch-effect removal, QC, statistics, annotation, clustering, network creation, lineage characterization, alternative exon visualization, gene-set enrichment and more).
UMI-tools / Unique Molecular Identifiers-tools
Demonstrates the value of properly accounting for errors in unique molecular identifiers (UMIs). UMI-tools removes PCR duplicates and implements a number of different UMI deduplication schemes. It can extract, remove and append UMI sequences from fastq reads. Compared with previous method, this one is superior at estimating the true number of unique molecules. The simulations provide an insight into the impact on quantification accuracy and indicate that application of an error-aware method is even more important with higher sequencing depth.
ESAT / End Sequence Analysis ToolKit
A toolkit designed for the analysis of short reads obtained from end-sequence RNA-seq. ESAT addresses mis-annotated or sample-specific transcript boundaries by providing a search step in which it identifies possible unannotated ends de novo. It provides a robust handling of multi mapped reads, which is critical in 3’ DGE analysis. ESAT provides a module specifically designed for alternative start or 3’ UTR (untranslated region) differential isoform expression. It also includes a set of features specifically designed for the analysis of single-cell RNA-seq data.
TRAPeS / TCR Reconstruction Algorithm for Paired-End Single-cell
Reconstructs T cell receptors (TCRs) from paired-end sequencing libraries of single cells, even at short (25 bp) read length. TRAPeS is a software that works on the original reads - leading to increased sensitivity. The TRAPeS algorithm has four main steps: (i) identifying putative pairs of variable (V) and joining (J) segments, (ii) collecting putative CDR3-originating reads, (iii) reconstructing the CDR3 and (iv) separating similar TCRs and determining chain productivity.
Dr.seq
Allows quality control (QC) and analysis components of parallel single cell transcriptome and epigenome data. Dr.seq is a quality control (QC) and analysis pipeline that provides both multifaceted QC reports and cell clustering results. Parallel single cell transcriptome data generated by different technologies can be transformed to the standard input with contained functions. Using relevant commands, the software can also be used to report quality measurements based on four aspects and can generate detailed analysis results for scATAC-seq and Drop-ChIP datasets.
WemIQ / Weighted-log-likelihood expectation maximization method on Isoform Quantification
Integrates an effective bias removal with a weighted expectation maximization (EM) algorithm to distribute reads among isoforms efficiently. WemIQ improves the quantification of isoform and gene expression as well as the derived exon inclusion rates. It provides robust expression estimates across different laboratories and protocols, which is valuable for the integrative analysis of RNA-seq. This tool can distinguish bias heterogeneity from true biological heterogeneity.
Falco
A cloud-based framework designed for multi-sample analysis of transcriptomic data in an efficient and scalable manner. Falco utilises state-of-the-art big data technology of Apache Hadoop and Apache Spark to perform massively parallel alignment, quality control, and feature quantification of single-cell transcriptomic data in Amazon Web Service (AWS) cloud-computing environment. We have evaluated the performance of Falco using two public scRNA-seq datasets and demonstrated Falco's scalability. The result shows Falco performs at least 2.6x faster against a highly optimized single node analysis and a reduction in runtime with increasing number of computing nodes. Falco also allows user to the utilise low-cost spot instances of AWS, providing a 65% reduction in cost of analysis.
zUMIs
Processes raw reads to count tables for RNA-seq data using Unique Molecular Identifiers (UMIs). zUMIs is a pipeline applicable for most experimental designs of RNA-seq data, such as single-nuclei sequencing techniques. This method allows for down sampling of reads before summarizing UMIs per feature, which is recommended for cases of highly different read numbers per sample. zUMIs is flexible with respect to the length and sequences of the barcodes (BCs) and UMIs, making it compatible with a large number of protocols.
FastProject
A software package for two-dimensional visualization of single cell data, which utilizes a plethora of projection methods and provides a way to systematically investigate the biological relevance of these low dimensional representations by incorporating domain knowledge. Annotated gene sets (referred to as gene 'signatures') are incorporated so that features in the projections can be understood in relation to the biological processes they might represent. FastProject provides a novel method of scoring each cell against a gene signature so as to minimize the effect of missed transcripts as well as a method to rank signature-projection pairings so that meaningful associations can be quickly identified. Additionally, FastProject is written with a modular architecture and designed to serve as a platform for incorporating and comparing new projection methods and gene selection algorithms.
PlateEffects2016
A package for the summation of counts across all cells on each plate for each gene. The count sums can then be used in a differentially expressed (DE) analysis, effectively treating plates as individual samples. This restores type I error control and avoids the detection of excessive false positives. Summation prior to DE analyses also affects the biological conclusions of a real scRNA-seq study, by decreasing the size of the DE lists and improving the ranking of relevant genes relative to a conventional single-cell analysis.
scater
Contains useful tools for the analysis of single-cell gene expression data using the statistical software R. scater places an emphasis on tools for quality control, visualisation and pre-processing of data before further downstream analysis. scater enables the following: (i) automated computation of QC metrics; (ii) transcript quantification from read data with pseudo-alignment; (iii) data format standardisation; (iv) rich visualisations for exploratory analysis; (v) seamless integration into the Bioconductor universe; (vi) simple normalisation methods.
TASC / Toolkit for Analysis of Single Cell RNA-seq
Incorporates the technical parameters, which reflect cell-to-cell batch effects, into a hierarchical mixture model to estimate the biological variance of a gene and detect differentially expressed genes. TASC is a statistical framework, to reliably model the cell-specific dropout rates and amplification bias by use of external RNA spike-ins. It is programmed to be computationally efficient, taking advantage of multi-threaded parallelization.
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