to_genomic_ranges: Convert input sequences to a GRanges object (fast backend)

In TmCalculator: Genome-Wide Nucleic Acid Melting Temperature Profiling and Multi-Omics Integration

Convert input sequences to a GRanges object (fast backend)

Description

Drop-in replacement for to_genomic_ranges that uses the fast coordinate backend in coor_to_genomic_ranges for genomic coordinate input. Accepts the same input_seq and complement_seq arguments as to_genomic_ranges, plus a list input list(pkg_name = ..., seq = ...) for large tiling jobs.

This function processes a vector of sequences string, a FASTA file, or a character vector with genomic coordinates into a GenomicRanges object, optionally including complementary sequences. sequence names are parsed based on their format: - If names have this pattern "chr:start-end:strand:species[:name]" (e.g., "chr1:1-5:+:seq_1"), parse components into seqnames, ranges, strand, and name. - If names have this pattern "chr:start-end:strand" (e.g., "chr1:1-5:+"), parse components into seqnames, ranges, and strand. - If names have this pattern "chr:start-end" (e.g., "chr1:1-5"), parse components into seqnames and ranges. - If no names are provided, use default values: seqnames = "chr1", start = 1, width = sequence length, strand = "*", name = "1", etc. Complementary sequences are either provided or automatically generated.

Usage

to_genomic_ranges_fast(
  input_seq,
  complement_seq = NULL,
  method = c("vectorized", "preload_chr")
)

to_genomic_ranges(input_seq, complement_seq = NULL)

Arguments

input_seq	Input sequence(s) in 5' to 3' direction. Can be provided as either: - A character string (e.g., c("ATGCG", "GCTAG")) - A path to a FASTA file containing the sequence(s) - A character vector where each element is a string in the format "chr:start-end:strand:species" #' (e.g., "chr1:100-200:+:BSgenome.Hsapiens.UCSC.hg38"). Strand is "+" for positive or "-" for negative. - chr: Chromosome ID - start: Start position - end: End position - strand: positive or negative strand - species: Species name for reference genome (e.g., "BSgenome.Hsapiens.UCSC.hg38"), see BSgenome::available.genomes() for all available genomes. please make sure the genome package is installed, otherwise the function will stop.
complement_seq	Optional complementary sequences. If NULL, complementary sequences will be auto-generated. otherwise, the complementary sequences will be used as metadata. Can be provided as format of input_seq.
method	Sequence extraction method passed to coor_to_genomic_ranges. One of "vectorized" (default) or "preload_chr".

Value

A GRanges object. See coor_to_genomic_ranges for metadata columns when coordinate input is used.

A GenomicRanges object with seqnames, ranges, strand, name, sequence, Complement, and Tm as metadata.

Author(s)

Junhui Li

Examples

## Not run: 
gr <- to_genomic_ranges_fast(
  list(
    pkg_name = "BSgenome.Hsapiens.UCSC.hg38",
    seq = c("chr1:1000-1199:+:win1", "chr1:1200-1399:+:win2")
  )
)

## End(Not run)

# Using a character vector with auto-generated complementary sequences
seqs <- c("ATGCG", "GCTAG")
names(seqs) <- c("chr1:1-5:+:seq_1", "chr2:1-5:+")
gr <- to_genomic_ranges(seqs)
gr

# Using a character vector with provided complementary sequences
seqs <- c("ATGCG", "GCTAG")
comp_seqs <- c("TACGC", "CGTA")
gr <- to_genomic_ranges(seqs, comp_seqs)
gr

# Using a FASTA file
gr <- to_genomic_ranges(system.file("extdata", "example1.fasta", package = "TmCalculator"))
## Not run: 
# Using a character vector with genomic coordinates
seqs <- c(
  "chr1:1898000-1898050:+:BSgenome.Hsapiens.UCSC.hg38",
  "chr2:2563000-2563050:-:BSgenome.Hsapiens.UCSC.hg38"
)
gr <- to_genomic_ranges(seqs)
gr

## End(Not run)

TmCalculator documentation built on Aug. 28, 2026, 5:09 p.m.