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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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Construction of Whole Genomes from Scaffolds Using Single Cell Strand-Seq Data.

Mark Hills1,2, Ester Falconer1,3, Kieran O'Neill1,4

  • 1Terry Fox Laboratory, BC Cancer Agency, Vancouver, BC V5Z 1L3, Canada.

International Journal of Molecular Sciences
|April 3, 2021
PubMed
Summary

Strand-seq, a DNA sequencing technique, accurately organizes genome fragments into chromosomes. This method corrects and builds full-length chromosomes without overlapping sequences, improving genome assembly quality for various species.

Keywords:
Guinea pigStrand-seqTasmanian devilXenopuscontig assemblyferretgenome assemblygenome scaffoldspigreference genomeszebrafish

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • High-quality reference genomes are crucial for molecular biology and genomics research.
  • Accurate genome assembly relies on correctly organizing DNA fragments like contigs and scaffolds.
  • Previous work identified misoriented regions in human and mouse genomes using Strand-seq.

Purpose of the Study:

  • To demonstrate Strand-seq's capability in building and correcting full-length chromosomes.
  • To identify scaffolds belonging to the same chromosome and determine their order and orientation.
  • To improve genome assembly quality without relying on overlapping sequences.

Main Methods:

  • Utilizing Strand-seq, a single-cell sequencing technique preserving DNA directionality.
  • Applying genetic mapping principles based on template strand inheritance.
  • Clustering and ordering DNA scaffolds solely based on DNA strand directionality.

Main Results:

  • Strand-seq effectively maps assembly fragments into chromosome-sized clusters.
  • The method accurately determines scaffold order and orientation without new assembly data.
  • Improved genome assemblies were generated for ferret, pig, Xenopus, zebrafish, Tasmanian devil, and Guinea pig.

Conclusions:

  • Strand-seq is a powerful tool for constructing and correcting chromosome-level genome assemblies.
  • The technique enables precise ordering and orientation of DNA fragments based on strand inheritance.
  • This approach significantly enhances the accuracy and completeness of reference genomes.