asTX {ORFik} | R Documentation

## Map genomic to transcript coordinates by reference

### Description

Map range coordinates between features in the genome and transcriptome (reference) space.

### Usage

    asTX(
      grl,
      reference,
      ignore.strand = FALSE,
      x.is.sorted = TRUE,
      tx.is.sorted = TRUE
    )

### Arguments

`grl` | a `GRangesList` of ranges within the reference, grl must have column called names that gives grouping for result
`reference` | a GrangesList of ranges that include and are bigger or equal to grl ig. cds is grl and gene can be reference
`ignore.strand` | When ignore.strand is TRUE, strand is ignored in overlaps operations (i.e., all strands are considered "+") and the strand in the output is '*'. When ignore.strand is FALSE (default) strand in the output is taken from the transcripts argument. When transcripts is a GRangesList, all inner list elements of a common list element must have the same strand or an error is thrown. Mapped position is computed by counting from the transcription start site (TSS) and is not affected by the value of ignore.strand.
`x.is.sorted` | if x is a GRangesList object, are "-" strand groups pre-sorted in decreasing order within group, default: TRUE
`tx.is.sorted` | if transcripts is a GRangesList object, are "-" strand groups pre-sorted in decreasing order within group, default: TRUE

### Details

Similar to GenomicFeatures' pmapToTranscripts, but in this version the grl ranges are compared to reference ranges with same name, not by index. And it has a security fix.

### Value

a GRangesList in transcript coordinates

### See Also

Other ExtendGenomicRanges: `coveragePerTiling()`, `extendLeaders()`, `extendTrailers()`, `reduceKeepAttr()`, `tile1()`, `txSeqsFromFa()`, `windowPerGroup()`

### Examples

    seqname <- c("tx1", "tx2", "tx3")
    seqs <- c("ATGGGTATTTATA", "AAAAA", "ATGGGTAATA")
    grIn1 <- GRanges(seqnames = "1",
                     ranges = IRanges(start = c(21, 10), end = c(23, 19)),
                     strand = "-")
    grIn2 <- GRanges(seqnames = "1",
                     ranges = IRanges(start = c(1), end = c(5)),
                     strand = "-")
    grIn3 <- GRanges(seqnames = "1",
                     ranges = IRanges(start = c(1010), end = c(1019)),
                     strand = "-")
    grl <- GRangesList(grIn1, grIn2, grIn3)
    names(grl) <- seqname
    # Find ORFs
    test_ranges <- findMapORFs(grl, seqs,
                     "ATG|TGG|GGG",
                     "TAA|AAT|ATA",
                     longestORF = FALSE,
                     minimumLength = 0)
    # Genomic coordinates ORFs
    test_ranges
    # Transcript coordinate ORFs
    asTX(test_ranges, reference = grl)
    # seqnames will here be index of transcript it came from

[Package ORFik version 1.12.13 Index]