Finds markers (differentially expressed genes) for identity classes
FindMarkers(object, ident.1, ident.2 = NULL, genes.use = NULL,
thresh.use = 0.25, test.use = "bimod", min.pct = 0.1,
print.bar = TRUE, only.pos = FALSE, max.cells.per.ident = Inf)Seurat object
Identity class to define markers for
A second identity class for comparison. If NULL (default) - use all other cells for comparison.
Genes to test. Default is to use all genes.
Limit testing to genes which show, on average, at least X-fold difference (log-scale) between the two groups of cells. Default is 0.25 Increasing thresh.use speeds up the function, but can miss weaker signals.
Denotes which test to use. Seurat currently implements "bimod" (likelihood-ratio test for single cell gene expression, McDavid et al., Bioinformatics, 2011, default), "roc" (standard AUC classifier), "t" (Students t-test), and "tobit" (Tobit-test for differential gene expression, as in Trapnell et al., Nature Biotech, 2014)
- only test genes that are detected in a minimum fraction of min.pct cells in either of the two populations. Meant to speed up the function by not testing genes that are very infrequently expressed. Default is 0.1
Print a progress bar once expression testing begins (uses pbapply to do this)
Only return positive markers (FALSE by default)
Down sample each identity class to a max number. Default is no downsampling. Not activated by default (set to Inf)
Matrix containing a ranked list of putative markers, and associated statistics (p-values, ROC score, etc.)