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Hybrid De Novo Genome Assembly for the Generation of Complete Genomes of Urinary Bacteria using Short- and Long-read Sequencing Technologies
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Phased Genome Assemblies.

Jorge Duitama1

  • 1Systems and Computing Engineering Department, Universidad de los Andes, Bogotá, Colombia. ja.duitama@uniandes.edu.co.

Methods in Molecular Biology (Clifton, N.J.)
|November 6, 2022
PubMed
Summary
This summary is machine-generated.

Generating phased genome assemblies from long reads is now achievable. Advanced algorithms and sequencing technologies enable separate reconstruction of chromosome copies, overcoming previous limitations in haplotype information. This facilitates complete genome assembly.

Keywords:
AlgorithmsGenomicsPhased assemblyPloidySequencing

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • De novo genome assembly aims to reconstruct individual chromosome sequences from diploid organisms.
  • Generating allele linkage information for phased assemblies has been a significant challenge.
  • Most current assemblies are haploid mixtures, lacking distinct chromosome copy sequences.

Purpose of the Study:

  • To review milestones in traditional genome assembly and bioinformatic techniques for haplotype information.
  • To examine current algorithms for phased genome assembly using long, accurate reads.
  • To highlight advancements enabling chromosome-level assemblies of complex genomes.

Main Methods:

  • Utilizing long (20 kb) and accurate sequencing reads.
  • Employing haplotype-aware error correction for raw reads.
  • Modifying overlap-layout-consensus (OLC) graphs to differentiate reads from homologous chromosomes.

Main Results:

  • Development of algorithms to eliminate erroneous edges between reads from different chromosome copies.
  • Successful incorporation of large presence-absence variants between chromosome copies.
  • Improved read quality through haplotype-aware error correction.

Conclusions:

  • Long-read sequencing technologies are fundamental for phased genome assembly.
  • Novel algorithms and improved sequencing have overcome previous limitations in reconstructing diploid genomes.
  • Chromosome-level assemblies of complex genomes are now feasible.