LCQS

LCQS performs lossless compression of quality scores in FASTQ files and provides fast random-access decompression for efficient storage and retrieval of sequencing quality data.

Key Features:

• Lossless Compression: Preserves per-base quality scores exactly during compression.
• High Compression Ratio and Speed: Reduces file sizes by up to 28.78% and attains compression speeds up to 29.1 times faster than other tools.
• Random Access Decompression: Provides fast random access decompression with access speed improvements up to 2.1 times.
• Robustness and Scalability: Maintains stable performance across diverse datasets and exhibits near-linear growth in compression speed with increasing input size.
• Hardware Optimization: Maximizes hardware utilization through a four-step processing approach (partitioning, indexing, packing, parallelizing) to enhance compression efficiency and decompression access speed.

Scientific Applications:

• FASTQ quality-score compression: Compresses per-base quality scores in FASTQ sequencing data to reduce storage while preserving the information needed for downstream analyses.
• Large-scale sequencing data management: Facilitates storage and rapid retrieval of quality scores in large genomic datasets and high-throughput sequencing projects.
• Cross-platform quality score support: Applies to a wide range of quality score types across different sequencing platforms.

Methodology:

LCQS implements four sequential processing steps: partitioning (dividing data into segments), indexing (building an index to support random access), packing (compressing segmented data), and parallelizing (leveraging parallel hardware to accelerate compression and decompression).