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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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Nanopore Data-Driven Near-T2T Genome Assembly of <i>Hippophae rhamnoides</i> ssp. <i>mongolica</i> Rousi and Its Complex Annotation.

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Progress in Flax Genome Assembly from Nanopore Sequencing Data.

Elena N Pushkova1, Alexander A Arkhipov1,2, Nadezhda L Bolsheva1

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991 Moscow, Russia.

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Summary

Researchers generated high-quality flax (Linum usitatissimum L.) genome assemblies using Oxford Nanopore Technologies (ONT) sequencing. These new assemblies improve upon existing references, aiding genetic research and crop improvement for this multipurpose plant.

Keywords:
HifiasmLinum usitatissimumNanoporeflaxgenome assemblylong-read sequencingtelomere-to-telomere

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Area of Science:

  • Genomics
  • Plant Science
  • Bioinformatics

Background:

  • Genome assembly quality has significantly improved with third-generation sequencing and advanced bioinformatics.
  • Flax (Linum usitatissimum L.) is a valuable multipurpose crop, but high-quality genome references are crucial for its genetic advancement.

Purpose of the Study:

  • To generate high-quality, near-telomere-to-telomere (T2T) genome assemblies for two flax varieties, K-3018 and Svyatogor.
  • To assess the quality of these assemblies against existing flax genome references.

Main Methods:

  • Utilized Oxford Nanopore Technologies (ONT) simplex R10.4.1 sequencing data.
  • Employed the Hifiasm algorithm optimized for ONT reads.
  • Validated assemblies using Hi-C contact maps and Illumina sequencing data.

Main Results:

  • Successfully assembled the K-3018 genome (491.1 Mb) and Svyatogor genome (497.8 Mb), each comprising mostly complete chromosomes with telomeric repeats.
  • The K-3018 and Svyatogor assemblies exceed the quality of the current reference flax genome (variety T397).
  • Comparative analysis indicated general similarity between flax genomes at the chromosome level with minor large-scale variations.

Conclusions:

  • Achieved two near-T2T flax genome assemblies using ONT simplex R10.4.1 reads and Hifiasm, without PacBio HiFi or optical maps.
  • High-quality flax genomes are vital for advancing genetic research, assessing diversity, and developing breeding and genome editing strategies.