Editing Portal:Life Sciences (section)

=== Bioinformatics pipelines ===

A bioinformatics pipeline is a chain of computational steps that transforms raw data into interpreted results. Perl became a common pipeline language because it was good at coordinating external programs and processing intermediate files.

A typical Perl-based genomics pipeline might:

* receive raw sequence files from an instrument;
* check file names and sample metadata;
* trim low-quality regions;
* mask repetitive sequence;
* run sequence assembly or alignment tools;
* parse logs and error files;
* run BLAST or HMM searches;
* annotate predicted genes;
* load results into a database;
* generate HTML, text, or spreadsheet reports;
* email researchers when a run completed or failed.

This pipeline role mattered because many bioinformatics tools were specialized command-line programs. Perl acted as the layer that connected them.

Perl’s strength in pipelines also explains why it remained common in laboratories even after newer languages became fashionable. Once a working pipeline existed, rewriting it was risky. Many Perl bioinformatics scripts remained in use because they were trusted, tested, and connected to laboratory practice.