bedtools_bamtobed

bedtools_bamtobed converts BAM files to BED format to facilitate genomic feature analysis by computing end coordinates from CIGAR strings, assigning QNAME as the name field, and using MAPQ as the score.

Key Features:

• Conversion with CIGAR parsing: Converts BAM alignments into BED intervals and computes end coordinates by interpreting the CIGAR string for each alignment.
• Name and score mapping: Assigns the BAM QNAME to the BED name field and uses MAPQ as the default BED score.
• Format interoperability: Produces BED output suitable for comparison and manipulation alongside BED and GFF feature formats within the BEDTools suite.
• Scalability and pipeline integration: Processes large next-generation sequencing alignment datasets and can be integrated into Unix-based analysis pipelines.

Scientific Applications:

• Genomic feature analysis: Enables interval-based analyses of genomic features such as gene expression, variant calling, and structural variation by representing alignments as BED intervals.
• Correlation and overlap studies: Facilitates testing correlations and intersections between different genomic feature sets by converting alignments into comparable BED intervals.

Methodology:

Parses BAM alignments, interprets CIGAR strings to determine end coordinates, assigns QNAME to the BED name field, and uses MAPQ as the BED score.