Comments (1)
@stephenchea I don't have a perfect answer, but you would want to perform batch correction operations before creating the URD object, probably. I've used mnnCorrect (https://rdrr.io/bioc/scran/man/mnnCorrect.html) from the Marioni lab for this previously, which worked ok. I've also been very impressed with the new integration methods in the most recent release of Seurat (https://satijalab.org/seurat/v3.0/immune_alignment.html) and they've worked well on some data I'm working on now. You might want to look into trying one of those, and then building your diffusion map & calculating pseudotime on the batch corrected data. Another approach that we've tried in the past is calculating NMF modules on the data (https://github.com/YiqunW/NMF); often there is one or two modules that are specific to each batch -- sometimes you can grab the highly loaded genes from those modules and exclude them from your variable gene list (and downstream dimensionality reduction, diffusion map, and pseudotime analysis) to avoid using them downstream (assuming that the list doesn't include many/any developmentally important genes). We've sometimes found that they are mostly histone or ubiquitously expressed genes.
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