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Updated: Sep 13, 2025
09:44
Characterization of a Pathogenic Escherichia coli Strain Derived from Oreochromis spp. Farms Using Whole-Genome Sequencing
Published on: December 23, 2022
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Escherichia coli with a 57-codon genetic code.
Wesley E Robertson1, Fabian B H Rehm1, Martin Spinck1
1Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK.
Science (New York, N.Y.)
|July 31, 2025
Summary
Scientists engineered a synthetic genome in *Escherichia coli*, reducing the codon set from 64 to 55. This synthetic organism, Syn57, demonstrates a novel approach to genetic code manipulation for protein synthesis.
Area of Science:
- Synthetic biology
- Genomics
- Molecular biology
Background:
- The standard genetic code utilizes 64 codons for 20 amino acids and protein synthesis.
- Modifying the genetic code offers potential for novel biological functions and engineered organisms.
Purpose of the Study:
- To design and construct a synthetic genome in *Escherichia coli* with a reduced codon set.
- To investigate the feasibility of using fewer codons for encoding canonical amino acids.
Main Methods:
- Engineered a 4 Mb synthetic genome for *Escherichia coli*.
- Replaced specific sense codons and a stop codon with synonymous codons within the genome.
Main Results:
- Successfully generated a synthetic organism, named Syn57.
- Syn57 utilizes a reduced set of 55 codons to encode the 20 canonical amino acids.
- Demonstrated the viability of a genome with a modified codon usage.
Conclusions:
- The study successfully created a synthetic *E. coli* with a significantly reduced codon set.
- This work validates the possibility of re-engineering the genetic code for a minimal codon system.
- Syn57 represents a foundational step towards minimal genome design and synthetic life research.
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