Multi-CAR

Multi-CAR performs contig scaffolding by using multiple complete reference genomes to order and orient contigs from draft genomes assembled from next-generation sequencing.

Key Features:

• Multiple Reference Utilization: Uses multiple complete genomes as references to mitigate errors arising from genomic rearrangements or distant phylogenetic relationships when ordering and orienting contigs.
• Heuristic Methodology: Implements a heuristic method that does not require prior knowledge of phylogenetic relationships among the draft and reference genomes and does not require libraries of paired-end reads.
• Validation and Performance: Tested on real prokaryotic genome datasets and benchmarked against Ragout and MeDuSa, demonstrating improved sensitivity, precision, genome coverage, reduced scaffold number, and increased scaffold N50 size.

Scientific Applications:

• Assembly of complex or poorly characterized genomes: Improves contig ordering and orientation for organisms lacking a close single reference genome.
• Analysis of genomes with significant rearrangements: Provides more reliable scaffolding for genomes that differ structurally from available references.
• Evolutionary biology: Supports comparative analysis of genome structure and rearrangement events across related organisms.
• Comparative genomics: Facilitates cross-species genome comparisons by producing higher-coverage scaffolds.
• Functional genomics: Enables better downstream gene context and synteny analyses through improved scaffold continuity.
• Microbial ecology: Assists in assembling prokaryotic genomes from diverse microbial communities where multiple references can guide scaffolding.

Methodology:

Employs multiple complete reference genomes and a heuristic algorithm to order and orient contigs, operates without requiring phylogenetic relationship information or paired-end read libraries, and was benchmarked against Ragout and MeDuSa on prokaryotic genome datasets.