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author iuc
date Thu, 18 Jul 2019 11:08:33 -0400
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1 # Wrappers for Scater
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3 This code wraps a number of [scater](https://bioconductor.org/packages/release/bioc/html/scater.html) functions as Galaxy wrappers. Briefly, the `scater-create-qcmetric-ready-sce` tool takes a sample gene expression matrix (usually read-counts) and a cell annotation file, creates a [SingleCellExperiment](https://bioconductor.org/packages/release/bioc/html/SingleCellExperiment.html) object and runs scater's `calculateQCMetrics` function (using other supplied files such as ERCC's and mitochondrial gene features).
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4 Various filter scripts are provided, along with some plotting functions for QC.
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7 ## Typical workflow
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9 1. Read in data with `scater-create-qcmetric-ready-sce`.
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10 2. Visualise it.\
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11 Take a look at the distribution of library sizes, expressed features and mitochondrial genes with `scater-plot-dist-scatter`.
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12 Then look at the distibution of genes across cells with `scater-plot-exprs-freq`.
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13 3. Guided by the plots, filter the data with `scater-filter`.\
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14 You can either manually filter with user-defined parameters or use PCA to automatically removes outliers.
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15 4. Visualise data again to see how the filtering performed using `scater-plot-dist-scatter`.\
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16 Decide if you're happy with the data. If not, try increasing or decreasing the filtering parameters.
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17 5. Normalise data with `scater-normalize`.
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18 6. Investigate other confounding factors.\
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19 Plot the data (using PCA) and display various annotated properties of the cells using `scater-plot-pca`.
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21 ## Command-line usage
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23 For help with any of the following scripts, run:
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24 `<script-name> --help`
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26 ---
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28 `scater-create-qcmetric-ready-sce.R`
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29 Takes an expression matrix (usually read-counts) of samples (columns) and gene/transcript features (rows), along with other annotation information, such as cell metadata, control genes (mitochondrail genes, ERCC's), creates a [SingleCellExperiment](https://bioconductor.org/packages/release/bioc/html/SingleCellExperiment.html) object and runs scater's `calculateQCMetrics`. Save the resulting SingleCellExperiment object in Loom format.
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32 ```
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33 ./scater-create-qcmetric-ready-sce.R -a test-data/counts.txt -c test-data/annotation.txt -f test-data/mt_controls.txt -o test-data/scater_qcready.loom
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34 ```
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36 ---
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38 `scater-plot-dist-scatter.R`
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39 Takes SingleCellExperiment object (from Loom file) and plots a panel of read and feature graphs, including the distribution of library sizes, distribution of feature counts, a scatterplot of reads vs features, and % of mitochondrial genes in library.
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41 ```
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42 ./scater-plot-dist-scatter.R -i test-data/scater_qcready.loom -o test-data/scater_reads_genes_dist.pdf
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43 ```
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45 ---
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47 `scater-plot-exprs-freq.R`
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48 Plots mean expression vs % of expressing cells and provides information as to the number of genes expressed in 50% and 25% of cells.
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50 ---
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52 `scater-pca-filter.R`
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53 Takes SingleCellExperiment object (from Loom file) and automatically removes outliers from data using PCA. Save the filtered SingleCellExperiment object in Loom format.
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55 ```
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56 ./scater-pca-filter.R -i test-data/scater_qcready.loom -o test-data/scater_pca_filtered.loom
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57 ```
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59 ---
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61 `scater-manual-filter.R`
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62 Takes SingleCellExperiment object (from Loom file) and filters data using user-provided parameters. Save the filtered SingleCellExperiment object in Loom format.
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64 ```
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65 ./scater-manual-filter.R -i test-data/scater_qcready.loom -l 10000 -d 4 -m 33 -o test-data/scater_manual_filtered.loom
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66 ```
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70 `scater-normalize.R`
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71 Compute log-normalized expression values from count data in a SingleCellExperiment object, using the size factors stored in the object. Save the normalised SingleCellExperiment object in Loom format.
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73 ```
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74 ./scater-normalize.R -i test-data/scater_manual_filtered.loom -o test-data/scater_man_filtered_normalised.loom
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75 ```
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79 `scater-plot-pca.R`
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80 PCA plot of a normalised SingleCellExperiment object (produced with `scater-normalize.R`). The options `-c`, `-p`, and `-s` all refer to cell annotation features. These are the column headers of the `-c` option used in `scater-create-qcmetric-ready-sce.R`.
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82 ```
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83 ./scater-plot-pca.R -i test-data/scater_man_filtered_normalised.loom -c Treatment -p Mutation_Status -o test-data/scater_pca_plot.pdf
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84 ```