Fix Seurat v4 integration issue with SCTransform and geosketch

pipeline-runner/R/qc-6-integrate_scdata-seuratv4.R

@@ -231,8 +231,13 @@ seuratv4_geosketch_find_and_integrate_anchors <-
     # merge
     scdata <- create_scdata(scdata_list, cells_id, merge_data = TRUE)
     # geosketch needs PCA to be run
+  if (Seurat::DefaultAssay(scdata) == "SCT") {
+    scdata_features <- Seurat::SelectIntegrationFeatures(object.list = scdata_list, nfeatures = 2000)
+    Seurat::VariableFeatures(scdata[["SCT"]]) <- scdata_features
+  } else {
+    scdata <- Seurat::FindVariableFeatures(scdata, assay = "RNA", nfeatures = 2000, verbose = FALSE)
+  }
     scdata <- scdata |>
-      Seurat::FindVariableFeatures(assay = "RNA", nfeatures = 2000, verbose = FALSE) |>
       Seurat::ScaleData(verbose = FALSE) |>
       Seurat::RunPCA(npcs = npcs, verbose = FALSE)
 

pipeline-runner/R/qc-6-subsample-geosketch.R

@@ -30,7 +30,7 @@ run_geosketch <- function(scdata, dims, perc_num_cells, reduction = "pca") {
   embeddings <- scdata@reductions[[reduction]]@cell.embeddings[, 1:dims]
   index <- unlist(geosketch$gs(embeddings, as.integer(num_cells), one_indexed = TRUE))
   sketch <- scdata[, index]
-  Seurat::DefaultAssay(sketch) <- "RNA"
+
   sketch@misc[["active.reduction"]] <- reduction
 
   return(list(scdata = scdata, sketch = sketch))

pipeline-runner/tests/testthat/test-qc-6-integrate_scdata-seuratv4.R

@@ -272,7 +272,6 @@ test_that("create_scdata merge the data slots when merge_data is TRUE", {
 
 
 test_that("misc slot is complete after Seurat V4 integration", {
-
   # mock a bigger dataset to run Seurat v4 integration without skipping it
   c(scdata_list, sample_1_id, sample_2_id) %<-% suppressWarnings(mock_scdata(n_rep = 3))
   cells_id <- list("123abc" = scdata_list$`123abc`$cells_id, "123def" = scdata_list$`123def`$cells_id)
@@ -312,3 +311,24 @@ test_that("misc slot is complete after Seurat V4 integration with geosketch", {
 
   expect_setequal(names(integrated_scdata@misc), expected_misc_names)
 })
+
+
+test_that("default assay in the integrated object matches normalisation method after Seurat V4 integration with geosketch", {
+  # mock a bigger dataset to run Seurat v4 integration without skipping it
+  c(scdata_list, sample_1_id, sample_2_id) %<-% suppressWarnings(mock_scdata(n_rep = 3))
+  cells_id <- list("123abc" = scdata_list$`123abc`$cells_id, "123def" = scdata_list$`123def`$cells_id)
+
+  normalisation_methods <- c("logNormalize", "SCT")
+
+  for (normalisation_method in normalisation_methods) {
+    config <- list(
+      dimensionalityReduction = list(numPCs = 10, method = "rpca"),
+      dataIntegration = list(method = "seuratv4", methodSettings = list(seuratv4 = list(numGenes = 10, normalisation = normalisation_method))),
+      downsampling = list(method = "geosketch", methodSettings = list(geosketch = list(percentageToKeep = 50))))
+
+    integrated_scdata <- suppressWarnings(integrate_scdata(scdata_list, config, "", cells_id, task_name = "dataIntegration")$data)
+    expect_s4_class(integrated_scdata, "Seurat")
+    expected_assay <- if (normalisation_method == "logNormalize") "RNA" else "SCT"
+    expect_equal(Seurat::DefaultAssay(integrated_scdata), expected_assay)
+  }
+})