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REXTAL: Regional Extension of Assemblies Using Linked-Reads.

Tunazzina Islam1, Desh Ranjan1, Eleanor Young2

  • 1Department of Computer Science, Old Dominion University, Norfolk, VA.

Bioinformatics Research and Applications : 14Th International Symposium, ISBRA 2018, Beijing, China, June 8-11, 2018, Proceedings. ISBRA (Conference) (14Th : 2018 : Beijing, China)
|February 5, 2020
PubMed
Summary
This summary is machine-generated.

A new method, Regional Extension of Assemblies Using Linked-Reads (REXTAL), enables complete de novo assembly of complex segmental duplication regions in genomes. This computational tool improves DNA assembly for challenging genomic areas.

Keywords:
10X sequencingLinked-read sequencingSubtelomereassemblygenome gapssegmental duplicationstructural variation

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Complete de novo assembly of segmentally duplicated genome regions is currently impossible using standard short-read sequencing data.
  • Segmental duplications and subtelomeric regions are challenging to assemble due to their repetitive nature and complexity.

Purpose of the Study:

  • To develop a novel computational method for improved region-specific assembly of segmental duplication-containing DNA.
  • To enable the extension of DNA assemblies into previously inaccessible genomic regions, such as subtelomeres.

Main Methods:

  • Development of Regional Extension of Assemblies Using Linked-Reads (REXTAL), a computational method.
  • Leveraging linked-read sequencing data generated from large DNA molecules partitioned using the "Gel Bead in Emulsion" (GEM) microfluidic method.
  • Application of REXTAL for extending single-copy diploid DNA assemblies into adjacent segmental duplication and subtelomeric gap regions.

Main Results:

  • REXTAL successfully extends DNA assembly into otherwise inaccessible subtelomere segmental duplication regions and other subtelomeric gaps.
  • The method demonstrates the feasibility of achieving complete de novo assembly for these complex genomic regions.
  • REXTAL is computationally more efficient for directed assembly of these regions across multiple genomes compared to genome-wide approaches.

Conclusions:

  • REXTAL provides a significant advancement in assembling complex and repetitive genomic regions, particularly segmental duplications and subtelomeres.
  • This method facilitates more accurate structural variation analysis and comparative genomics by improving the assembly of challenging DNA segments.
  • REXTAL offers a computationally efficient solution for targeted genome assembly tasks.