Editing Portal:Life Sciences (section)

=== BLAST parsing and sequence similarity ===

BLAST, the Basic Local Alignment Search Tool, became one of the most important tools in computational biology. It allowed researchers to compare DNA or protein sequences against large databases and identify similar sequences. This made it possible to infer gene function, identify homologs, classify sequences, detect contamination, study evolution, and annotate genomes.

Perl became a common language for BLAST automation. Researchers used Perl to run BLAST jobs, split large FASTA files, collect output, parse hits, filter by score or e-value, and generate reports.

This mattered because BLAST output was often not the final scientific answer. The output had to be interpreted, filtered, combined with annotations, and compared against other results. Perl scripts helped transform raw BLAST output into usable biological conclusions.

Many past discoveries in gene annotation and comparative genomics depended on this kind of computational interpretation. Perl did not discover the genes by itself, but it helped researchers process the evidence that supported gene discovery, protein-family assignment, orthology, and functional prediction.