gatk_indel_realigner

gatk_indel_realigner performs local realignment of sequencing reads around insertion-deletion (indel) polymorphisms to correct misalignments and improve the accuracy of downstream variant calling from next-generation sequencing data.

Key Features:

• Local Realignment Around Indels: Performs local realignment of reads around insertion-deletion (indel) polymorphisms to correct misalignments that can produce erroneous variant calls.
• Integration with GATK Pipeline: Integrates into the GATK workflow and is used alongside initial read mapping, base quality score recalibration (BQSR), SNP discovery and genotyping, and machine learning-based filtering.
• Compatibility with Sequencing Technologies: Operates on data from multiple next-generation sequencing platforms and experimental designs.
• Support for Multi-sample Analysis: Contributes to multi-sample discovery and genotyping workflows to increase sensitivity and specificity across samples.

Scientific Applications:

• Human Disease Research: Improves precision of indel calls to support identification of genetic variants associated with disease.
• Ancestry and Evolution Studies: Enhances accuracy of variant calls for population genetics, ancestry inference, and evolutionary analyses.
• Large-Scale Genomic Projects: Has been applied to large datasets such as the 1000 Genomes Project to support analysis of extensive genomic data.

Methodology:

Identifies regions around indels with suspected misalignments and performs local realignment of reads to reduce false-positive and false-negative variant calls in subsequent variant-calling steps.