IUPAC_CODE_MAP: The IUPAC Extended Genetic Alphabet
In anandhupresannan/biostrings: Efficient manipulation of biological strings

Description Usage Arguments Details Value Author(s) References See Also Examples

The IUPAC_CODE_MAP named character vector contains the mapping from the IUPAC nucleotide ambiguity codes to their meaning.

The mergeIUPACLetters function provides the reverse mapping.

1 2	IUPAC_CODE_MAP mergeIUPACLetters(x)

`x`	A vector of non-empty character strings made of IUPAC letters.

IUPAC nucleotide ambiguity codes are used for representing sequences of nucleotides where the exact nucleotides that occur at some given positions are not known with certainty.

IUPAC_CODE_MAP is a named character vector where the names are the IUPAC nucleotide ambiguity codes and the values are their corresponding meanings. The meaning of each code is described by a string that enumarates the base letters ("A", "C", "G" or "T") associated with the code.

The value returned by mergeIUPACLetters is an unnamed character vector of the same length as its argument x where each element is an IUPAC nucleotide ambiguity code.

H. Pagès

http://www.chick.manchester.ac.uk/SiteSeer/IUPAC\_codes.html

IUPAC-IUB SYMBOLS FOR NUCLEOTIDE NOMENCLATURE: Cornish-Bowden (1985) Nucl. Acids Res. 13: 3021-3030.

DNAString, RNAString

  IUPAC_CODE_MAP
  some_iupac_codes <- c("R", "M", "G", "N", "V")
  IUPAC_CODE_MAP[some_iupac_codes]
  mergeIUPACLetters(IUPAC_CODE_MAP[some_iupac_codes])

  mergeIUPACLetters(c("Ca", "Acc", "aA", "MAAmC", "gM", "AB", "bS", "mk"))