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Chromosome assembly of large and complex genomes using multiple references.

Mikhail Kolmogorov1, Joel Armstrong2, Brian J Raney2

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Summary

Ragout 2 is a new bioinformatics tool that assembles large genomes into chromosomes. It uses evolutionary relationships to improve genome assemblies, achieving high accuracy for complex mammalian genomes.

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Area of Science:

  • Bioinformatics
  • Genomics
  • Computational Biology

Background:

  • Assembling large mammalian genomes into complete chromosomes is a significant challenge in bioinformatics.
  • Existing next-generation sequencing (NGS) assemblers struggle with complex genomes, leading to fragmented results.

Purpose of the Study:

  • To develop and evaluate Ragout 2, a reference-assisted assembly tool for creating chromosome-scale genome assemblies.
  • To address the limitations of current assembly methods for large and complex genomes.

Main Methods:

  • Ragout 2 utilizes target assemblies and related reference genomes to infer evolutionary relationships.
  • A genome rearrangement approach is employed to construct final, chromosome-scale assemblies.
  • The tool was tested on 16 laboratory mouse strains, Mus caroli, Mus pahari, and three ape genomes.

Main Results:

  • Ragout 2 successfully transformed NGS assemblies of 16 mouse strains into complete chromosomes with <5% unlocalized sequence.
  • Benchmarking indicated a low rate of structural errors in Ragout 2 assemblies, comparable to direct assembly methods.
  • Chromosome painting confirmed large-scale rearrangements detected by Ragout 2 in Mus caroli and Mus pahari.
  • Ragout 2 improved draft ape genome sequences into chromosome-scale assemblies with high accuracy.

Conclusions:

  • Ragout 2 is an effective tool for generating accurate, chromosome-scale genome assemblies for large and complex genomes.
  • The reference-assisted approach significantly improves genome assembly quality, even in the presence of karyotype variations.
  • Ragout 2 offers a valuable solution for advancing genomic research in mammals and other complex organisms.