Differential Accessibility for Single Cell
Differential Accessibility for Single Cell performs differential analysis from an input Peak Count Matrix () and groupings provided by Cell Clusters () or Cell Annotations ().
It is often most natural to run the tool from a Dimensionality Reduction Plot by right-clicking on the plot, see UMAP and tSNE plot functionality for details. However, it can also be found in the Toolbox here:
Chromatin Accessibility () | Differential Accessibility for Single Cell ()
The tool performs tests for differentially accessible peaks, nearby genes or transcription factors, as specified in the 'Data type' options group. The tests are summarized in the output Statistical Comparison Tables (), see Interpreting the output of Differential Expression for Single Cell for details.
The remaining options specify the type of test to be performed and how features can be filtered before testing, in a similar manner as done for Differential Expression for Single Cell, see Differential Expression for Single Cell for details.
Note that features that are present in few cells can lead to bands in the volcano plot, showing the relationship between the p-values and the log2 fold changes, see http://resources.qiagenbioinformatics.com/manuals/clcgenomicsworkbench/current/index.php?manual=Volcano_plots.html for details. Such features can span a wide range of fold changes but often have high p-values. To remove these bands, the features that are not present in sufficient cells can be filtered before testing, as detailed above.
Subsections