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Reference-based QUantification Of gene Dispensability (QUOD).

Katharina Sielemann1,2, Bernd Weisshaar3, Boas Pucker1,4

  • 1Genetics and Genomics of Plants, Center for Biotechnology (CeBiTec) & Faculty of Biology, Bielefeld University, 33615, Bielefeld, Germany.

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|February 10, 2021
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Summary
This summary is machine-generated.

A new method quantifies gene dispensability, moving beyond binary classifications. This approach identifies lineage-specific adaptation genes using a novel tool called QUantification Of gene Dispensability (QUOD).

Keywords:
Bioinformatic toolBioinformaticsDispensabilityGenomicsPangenomicsPresence/absence variations

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Area of Science:

  • Genomics
  • Bioinformatics

Background:

  • Gene dispensability is crucial for pangenome analysis, but current methods use arbitrary binary classifications (core/dispensable).
  • Existing classifications struggle with nuanced gene presence/absence across genomes, even with 'conditionally dispensable' categories.

Purpose of the Study:

  • To introduce a novel method for quantifying gene dispensability, moving beyond discrete classifications.
  • To present a dedicated tool, QUantification Of gene Dispensability (QUOD), for reference-based dispensability scoring.

Main Methods:

  • Developed a method to calculate gene-specific dispensability scores based on normalized coverage in read mappings.
  • Applied the method to 966 Arabidopsis thaliana accessions (Ath-966) as a proof of concept.
  • Validated the dispensability score by comparing Benchmarking Universal Single Copy Orthologs (BUSCOs) with other genes.

Main Results:

  • QUOD assigns a continuous dispensability score to each gene, overcoming binary limitations.
  • BUSCOs showed significantly lower average dispensability scores than non-BUSCO genes.
  • Genes involved in defense and antimicrobial responses were identified among those with high dispensability scores.

Conclusions:

  • QUOD facilitates the identification of candidate dispensable genes by assigning a dispensability score.
  • High dispensability scores highlight genes potentially involved in lineage-specific adaptations to environmental changes.