Bioinformatics Fundamentals

What it does

This skill provides foundational knowledge about bioinformatics, genomics, and related workflows. It helps users understand common file formats like SAM/BAM and AGP, sequencing technologies such as PacBio HiFi and Illumina, and data processing patterns used in biological data analysis. The skill explains key concepts like mapping quality (MAPQ), CIGAR strings, and the meaning of SAM flags to aid in troubleshooting and interpretation of genomic data.

When to use it

• Working with sequencing data from various technologies (PacBio HiFi, Hi-C, Illumina).
• Debugging issues related to SAM/BAM alignment or filtering.
• Processing AGP files for genome assembly curation.
• Understanding paired-end versus single-end data.
• Interpreting quality metrics like MAPQ and PHRED scores.
• Troubleshooting empty outputs or broken read pairs in bioinformatics pipelines.

Key capabilities

• Explanation of SAM/BAM file format, including flag combinations and their meanings.
• Understanding of the "proper pair" flag and its implications for alignment.
• Interpretation of Mapping Quality (MAPQ) scores and common thresholds.
• Description of CIGAR strings and their representation of read alignments.
• Overview of sequencing technologies like PacBio HiFi.

Example prompts

• "Explain what a SAM flag with value 99 means."
• "What is the significance of MAPQ scores in bioinformatics?"
• "Describe how to interpret a CIGAR string like '50M5I45M'."

Tips & gotchas

• This skill provides foundational knowledge; for complete details on SAM flags, CIGAR operations, and optional tags, refer to the referenced reference.md document.
• The criteria for "proper pairs" can vary between different alignment tools, so be mindful of that when interpreting results.
• A MAPQ score of 0 does not necessarily indicate an unmapped read; it could also signify equally good multiple mappings.