Please note that due to introduction of SingleCellExperiment class the old scater objects (SCESet class) will only be accepted until October 31, 2017. After that the old SCESet class will be deprecated in scmap and only objects of SingleCellExperiment will be accepted.
Single-cell RNA-seq (scRNA-seq) is widely used to investigate the composition of complex tissues. However, it is often challenging to directly compare the cells identified in two different experiments. scmap allows you to project cells from an scRNA-seq experiment (the Projection) on to the cell-types identified in a different experiment (the Reference).
manuscript is available on
scmap source code is available on GitHub.
scmap R package is also available on Bioconductor.
More information about the existing Reference can be found on our dataset website.
Please send your feedback/comments/suggestions to Vladimir Kiselev.
scmap is based on scater format. Please make yourself familiar with it before running scmap.
featureData slots of both the Reference and Projection dataset must have the feature_symbol column which contains Feature (gene/transcript) names from the same organism.
What would like to do?
What organism is your data from?
Your data is not in scater format! Please upload a data in the correct format.
featureData slot of your scater object does not contain a feature_symbol column. Please add it to your object and re-upload it.
scmap selects 500 most informative features (genes/transcripts) of the Reference dataset by fitting a linear model to the log(expression) vs log(dropout) distribution of features. The most informative features are shown in red on the plot below. Conceptually, these features have a higher dropout rate for a given mean expression. More information about the selected features is provided in the table below the plot. scmap scores are defined as the residuals of the linear model.
scmap projects all cells of the Projection dataset to the reference calculated from the Reference dataset. The Reference is computed by calculating the median expression in each of 500 selected features across all cells in each cell type.
scmap projects all cells of the Projection dataset to the precomputed References. The references were computed by selecting 500 most informative features of each Reference dataset and calculating the median expression in each of 500 features across all cells in each cell type.