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Updated: Jul 13, 2026
14:06
Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
Published on: November 12, 2012
An evaluation of Comparative Genome Sequencing (CGS) by comparing two previously-sequenced bacterial genomes
Christopher D Herring1, Bernhard Ø Palsson
1Department of Bioengineering, University of California San Diego, La Jolla, USA. cherring@mascoma.com
BMC Genomics
|August 19, 2007
Summary
Microarray-based Comparative Genome Sequencing (CGS) effectively detects bacterial genome mutations but may miss some complex changes. Further analysis is crucial for regions where single nucleotide polymorphisms (SNPs) are not called.
Area of Science:
- Genomics
- Microbial genomics
Background:
- Advancements in sequencing technology enable bacterial genome resequencing after experimental manipulation.
- Assessing the accuracy and completeness of mutation detection is critical for reliable experimental outcomes.
Purpose of the Study:
- To evaluate the accuracy of microarray-based Comparative Genome Sequencing (CGS) for bacterial genome resequencing.
- To establish confidence in mutation detection capabilities of CGS.
Main Methods:
- Resequencing of E. coli strain W3110 using Nimblegen's microarray-based CGS service.
- Utilizing E. coli strain MG1655 (fully sequenced) as a reference genome.
- Comparison of CGS results against known genomic differences.
Main Results:
- CGS detected most small sequence differences, deletions, and IS element insertions.
- A large chromosomal inversion was not detected by CGS.
- CGS identified apparent new mutations not in the reference genome, attributed to post-library changes.
- The false positive rate for single nucleotide polymorphisms (SNPs) was 1 per 244 Kb.
Conclusions:
- Microarray-based CGS is a cost-effective method for detecting multiple mutations between bacterial genomes.
- CGS may fail to detect mutations in repetitive or secondary structured sequences.
- Regions with uncalled SNPs warrant further investigation as they may indicate deletions or IS element insertions.
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