startCodons {ORFik} | R Documentation

## Get the Start codons(3 bases) from a GRangesList of orfs grouped by orfs

### Description

In ATGTTTTGA, get the positions ATG. It takes care of exons boundaries, with exons < 3 length.

### Usage

    startCodons(grl, is.sorted = FALSE)

### Arguments

`grl` | a `GRangesList` object
`is.sorted` | a boolean, a speedup if you know the ranges are sorted

### Value

a GRangesList of start codons, since they might be split on exons

### See Also

Other ORFHelpers: `defineTrailer()`, `longestORFs()`, `mapToGRanges()`, `orfID()`, `startSites()`, `stopCodons()`, `stopSites()`, `txNames()`, `uniqueGroups()`, `uniqueOrder()`

### Examples

    gr_plus <- GRanges(seqnames = "chr1",
                       ranges = IRanges(c(7, 14), width = 3),
                       strand = "+")
    gr_minus <- GRanges(seqnames = "chr2",
                        ranges = IRanges(c(4, 1), c(9, 3)),
                        strand = "-")
    grl <- GRangesList(tx1 = gr_plus, tx2 = gr_minus)
    startCodons(grl, is.sorted = FALSE)

[Package ORFik version 1.10.13 Index]