tranalign

tranalign generates nucleotide alignments of coding DNA sequences (CDS) from aligned protein sequences for comparative and evolutionary analyses.

Key Features:

• Protein-guided nucleotide alignment: Constructs nucleotide alignments by mapping aligned protein sequences back to their corresponding coding DNA sequences (CDS).
• Codon-aware reconstruction: Performs back-translation that accounts for codon usage and potential frameshifts to preserve reading frames in the nucleotide alignment.
• EMBOSS integration: Implemented within the EMBOSS suite and built on its C programming libraries to provide computationally consistent alignment routines.
• Extensibility via ACD files: Supports customization and extension through Application Control Definition (ACD) files within the EMBOSS framework.

Scientific Applications:

• Comparative Genomics: Enables nucleotide-level comparison across species by deriving CDS alignments from conserved protein alignments.
• Gene Annotation: Assists annotation efforts by producing nucleotide alignments that inform coding potential and exon boundaries based on protein homology.
• Molecular Evolution Studies: Facilitates analyses of selection, codon evolution, and sequence conservation within gene families or across taxa.

Methodology:

Tranalign takes aligned protein sequences as input and reconstructs corresponding nucleotide alignments by back-translating the protein alignment to DNA while considering codon usage and potential frameshifts.