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Related Concept Videos

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A universal genomic coordinate translator for comparative genomics.

Neda Zamani1, Görel Sundström, Jennifer R S Meadows

  • 1Science for Life Laboratory, Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden. neda.zamani@imbim.uu.se.

BMC Bioinformatics
|July 1, 2014
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Summary
This summary is machine-generated.

Kraken software efficiently identifies gene orthologs across many genomes by analyzing pairwise alignments, significantly reducing computational costs for evolutionary studies. This tool aids in understanding genomic duplications and gene family evolution.

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Area of Science:

  • Comparative genomics
  • Evolutionary biology
  • Bioinformatics

Background:

  • Genomic duplications are key evolutionary events, enabling gene diversification.
  • Synteny aids in identifying orthologous gene relationships across genomes.
  • Previous methods for comprehensive analysis required computationally intensive all-to-all genome alignments.

Purpose of the Study:

  • To develop a scalable software tool for analyzing genomic duplications and orthology across multiple genomes.
  • To overcome the computational limitations of all-to-all genome alignment methods.

Main Methods:

  • Introduced Kraken, a software that recursively traverses a graph of pairwise alignments to compute orthology.
  • Kraken dynamically re-computes orthology, avoiding the need for all-to-all genome alignments.
  • The method scales linearly with the number of genomes (N).

Main Results:

  • Kraken reduced computational runtime by an order of magnitude on Drosophila genomes with minimal loss in sensitivity.
  • Up to 93% of protein-coding transcripts in human, mouse, and rat genomes showed unambiguous orthologous relationships.
  • Identified thousands of novel transcribed loci, likely non-coding RNAs, with correlated expression across species.

Conclusions:

  • Kraken is a computational tool for cross-species genome comparisons, distinguishing orthologs from paralogs.
  • It eliminates the need for costly all-to-all whole genome mappings.
  • Kraken is freely available for facilitating large-scale genomic analyses.