variant annotation
The process of adding biological and clinical context to genetic variants identified through sequencing, including information about functional impact, disease associations, and therapeutic implications.
Full Definition
Variant annotation is a critical bioinformatics process that enriches raw genetic variant data with comprehensive biological and clinical information to enable clinical interpretation. This process involves querying multiple databases and knowledge sources to add details about gene function, protein effects, population frequencies, disease associations, drug interactions, and clinical significance. In cancer genomics, variant annotation systems integrate information from sources such as ClinVar, COSMIC, OncoKB, and literature databases to provide clinicians with the context needed to determine whether identified mutations are likely to be pathogenic, benign, or of uncertain significance. Modern annotation pipelines automatically process thousands of variants and flag those with potential clinical relevance for manual review by molecular pathologists or genetic counselors.
Usage
Usage note: Use as a compound noun; avoid hyphenation unless used as a modifier.
In Context
- "The variant annotation pipeline identified three clinically actionable mutations in the patient's tumor sample." — Molecular diagnostics report
- "Updated databases improved the accuracy of variant annotation for rare cancer predisposition syndromes." — Bioinformatics system documentation