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Gene fragmentation in bacterial draft genomes: extent, consequences and mitigation.

Jonathan L Klassen1, Cameron R Currie

  • 1Department of Bacteriology, University of Wisconsin-Madison, Madison, Wisconsin, USA. jlklassen@wisc.edu

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Summary

Draft bacterial genomes often contain fragmented open reading frames (ORFs), impacting annotation accuracy. Linking fragmented ORFs using related genomes can improve analysis, but requires sufficient data.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Microbial Ecology

Background:

  • Technological advances in genome sequencing reduce costs but decrease genome quality.
  • Short read lengths hinder bridging repetitive genomic regions, leading to fragmented open reading frames (ORFs).

Purpose of the Study:

  • To quantify ORF fragmentation in draft microbial genomes.
  • To assess the impact of fragmentation on annotation efficacy.
  • To propose a solution for ameliorating ORF fragmentation issues.

Main Methods:

  • Surveyed draft genomes in GenBank for ORF fragmentation.
  • Analyzed 25 Streptomyces genomes for fragmentation patterns.
  • Evaluated annotation rates (Pfam, COG, KEGG) with fragmented ORFs.
  • Tested a strategy of linking fragmented ORFs via orthologs.

Main Results:

  • Fragmented ORFs exceeded 80% in some draft genomes, correlating with lower assembly quality.
  • Fragmentation was enriched in specific protein classes (e.g., polyketide synthases).
  • Increased fragmentation led to higher false-negative Pfam/COG and false-positive KEGG annotations.
  • Linking fragmented ORFs via orthologs improved KEGG annotation accuracy up to 46% in some cases.

Conclusions:

  • Draft microbial genomes frequently contain ORF fragments that can confound comparative analyses.
  • Accounting for gene fragmentation is crucial for accurate comparative genomic studies.
  • The effectiveness of ortholog-based linking depends on data availability.