added simple-event-annotation as a command line script

src/main/r/simple-event-annotation.R

@@ -0,0 +1,64 @@
+# if (!requireNamespace("BiocManager", quietly = TRUE)) install.packages("BiocManager")
+#BiocManager::install("StructuralVariantAnnotation")
+#install.packages("stringr")
+suppressMessages(library(VariantAnnotation))
+suppressMessages(library(StructuralVariantAnnotation))
+suppressMessages(library(stringr))
+args=commandArgs(trailingOnly = TRUE)
+
+################################################################################
+# Check arguments
+if(length(args)!=3){
+  print("Incorrect number of arguments.\nUsage:\nRscript simple-event-annotation.R <PATH_TO_INPUT_VCF> <GENOME_NAME> <OUTPUT_PREFIX>")
+  quit()
+}
+if(!(file.exists(args[1]))){
+  print(paste("Cannot open input file:", args[1]))
+  quit()
+}
+fin=args[1]
+genome=args[2]
+prefix=args[3]
+################################################################################
+#' Simple SV type classifier
+simpleEventType <- function(gr) {
+  pgr = partner(gr)
+  return(ifelse(seqnames(gr) != seqnames(pgr), "CTX", # inter-chromosomosal
+                ifelse(strand(gr) == strand(pgr), "INV",
+                       ifelse(gr$insLen >= abs(gr$svLen) * 0.7, "INS", # TODO: improve classification of complex events
+                              ifelse(xor(start(gr) < start(pgr), strand(gr) == "-"), "DEL",
+                                     "DUP")))))
+}
+# using the example in the GRIDSS /example directory
+vcf <- readVcf(file=fin, genome=genome)
+info(header(vcf)) = unique(as(rbind(as.data.frame(info(header(vcf))), data.frame(
+  row.names=c("SIMPLE_TYPE"),
+  Number=c("1"),
+  Type=c("String"),
+  Description=c("Simple event type annotation based purely on breakend position and orientation."))), "DataFrame"))
+gr <- breakpointRanges(vcf)
+svtype <- simpleEventType(gr)
+info(vcf)$SIMPLE_TYPE <- NA_character_
+info(vcf[gr$sourceId])$SIMPLE_TYPE <- svtype
+# info(vcf[gr$sourceId])$SVLEN <- gr$svLen
+vcf@info[gr$sourceId, 'SVLEN'] <-  gr$svLen # Create a new entry for SVLEN and add corresponding data
+writeVcf(vcf, paste0(prefix, ".annotated.vcf")) # generated by example/gridss.sh
+
+# TODO: perform event filtering here
+# By default, GRIDSS is very sensitive but this comes at the cost of a high false discovery rate
+gr <- gr[gr$FILTER == "PASS" & partner(gr)$FILTER == "PASS"] # Remove low confidence calls
+
+simplegr <- gr[simpleEventType(gr) %in% c("INS", "INV", "DEL", "DUP")]
+simplebed <- data.frame(
+  chrom=seqnames(simplegr),
+  # call the centre of the homology/inexact interval
+  start=as.integer((start(simplegr) + end(simplegr)) / 2),
+  end=as.integer((start(partner(simplegr)) + end(partner(simplegr))) / 2),
+  name=simpleEventType(simplegr),
+  score=simplegr$QUAL,
+  strand="."
+)
+# Just the lower of the two breakends so we don't output everything twice
+simplebed <- simplebed[simplebed$start < simplebed$end,]
+write.table(simplebed, paste0(prefix,".simple.bed"), quote=FALSE, sep='\t', row.names=FALSE, col.names=FALSE)
+