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bioconductor-msa

The 'msa' package provides a unified R/Bioconductor interface to the multiple sequence alignment algorithms ClustalW, ClustalOmega, and Muscle. All three algorithms are integrated in the package, therefore, they do not depend on any externa

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msa

Dependencies & Environment

Package-intrinsic requirements from the Bioconductor landing page — reproduce in any R environment.

  • Version: 1.44.0 · Bioconductor: 3.23 · R: ≥ 4.6
  • Depends: Biostrings
  • Imports: Rcpp, BiocGenerics, IRanges, S4Vectors
  • System requirements: GNU make
  • Install: BiocManager::install("msa")

When to Use

  • Performing multiple sequence alignment of amino acid or nucleotide sequences using msa().
  • Generating highly customizable, publication-ready PDF visualizations of alignments using msaPrettyPrint().
  • Calculating consensus sequences and conservation scores using msaConsensusSequence() and msaConservationScore().

When NOT to Use

  • For aligning massive genomic datasets (e.g., whole genomes), use minimap2 because msa is designed for gene- or protein-scale alignments.
  • For basic pairwise sequence alignments, use pwalign because it is specifically built for pairwise comparisons.

Data Requirements

  • Input Format: Unaligned DNA, RNA, or Amino Acid sequences.
  • Structure: Loaded as an AAStringSet (or similar XStringSet) using readAAStringSet().

Key Parameters

  • output ("pdf"): Format for pretty-printing (e.g., "pdf", "asis").
  • showNames ("none"): Controls the display of sequence names in the printed alignment.
  • showLogo ("none"): Controls the display of the sequence logo (e.g., "top", "none").
  • shadingMode ("similar"): Mode for color shading in the alignment (e.g., "similar", "functional").
  • type ("upperlower"): Type of consensus sequence to generate.
  • askForOverwrite (FALSE): Whether to prompt before overwriting existing files during PDF generation.
  • gapVsGap (0): Score assigned to gap-versus-gap matches when calculating conservation scores.

Best Practices

  • Use unmasked() to retrieve the original alignment if a colmask() has been applied to hide specific columns.
  • Convert alignments to other formats using msaConvert() for downstream phylogenetic analysis (e.g., with seqinr or ape).
  • Use output="asis" in msaPrettyPrint() when integrating alignments into Sweave or knitr documents.

Common Pitfalls

  • PDF Compilation Failures: msaPrettyPrint() failing to compile PDFs; fix this by ensuring a working LaTeX system with the texshade.sty package is installed on your system path.
  • Alignments Running Off Page: Large alignments running off the page in PDFs; fix this by splitting the alignment into chunks using subseq() and printing them separately.
  • Memory Exhaustion: Running ClustalW on thousands of sequences can consume excessive memory; fix this by switching to ClustalOmega for large datasets.

Alternatives

  • DECIPHER: A powerful Bioconductor package for sequence alignment, database management, and oligonucleotide design.
  • ape: For phylogenetic analysis and basic sequence manipulation.
  • seqinr: For biological sequence retrieval and analysis.

Citations

  • Bodenhofer U, Bonatesta E, Horejs-Kainrath C, Hochreiter S. (2015) "msa: an R package for multiple sequence alignment." Bioinformatics.

References

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