ARYANA-BS

ARYANA-BS performs context-aware alignment of bisulfite sequencing reads by integrating DNA methylation patterns and genomic context to improve alignment accuracy.

Key Features:

• Five-index construction: ARYANA-BS constructs five indexes from the reference genome based on known DNA methylation patterns across different genomic contexts.
• Multi-index alignment: The tool aligns each read to all indexes and selects the alignment with the minimum penalty.
• Expectation-Maximization refinement: An optional EM step integrates methylation probability information to choose the optimal index for each read.
• Direct BS-specific base alteration integration: The aligner diverges from conventional DNA aligners by directly incorporating bisulfite-specific base alterations within its alignment engine.

Scientific Applications:

• DNA methylation analysis: ARYANA-BS enables accurate measurement of DNA methylation at single-base resolution in biological processes including imprinting, development, inflammation, and cancer.
• Cancer research: The tool demonstrates suitability for cancer research through robust alignment performance.
• Cell-free DNA studies: ARYANA-BS is applicable to cell-free DNA studies requiring accurate bisulfite sequencing alignment.
• Long-read and high-error read alignment: The aligner shows particular robustness in aligning longer, higher-error reads compared to existing methods.

Methodology:

ARYANA-BS constructs five indexes from the reference genome using known DNA methylation patterns across genomic contexts, aligns each read to all indexes, selects the alignment with minimum penalty, and optionally applies an Expectation-Maximization step that integrates methylation probability information for index selection.