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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Related Experiment Video

Updated: Nov 18, 2025

De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data
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Defining synonymous codon compression schemes by genome recoding.

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  • 1Medical Research Council Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK.

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Scientists developed a new method to rewrite bacterial genomes, enabling the creation of synthetic DNA. This breakthrough allows for systematic genome recoding in Escherichia coli, defining rules for genetic design.

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Area of Science:

  • Synthetic biology
  • Genomics
  • Molecular biology

Background:

  • Synthetic recoding of genomes aims to enable the synthesis of unnatural polymers using orthogonal translation systems.
  • Limited understanding of synonymous codon substitutions and lack of methods for stepwise genome replacement hinder progress.

Purpose of the Study:

  • To develop a system for efficient, programmable replacement of genomic DNA with long synthetic DNA in Escherichia coli.
  • To establish feedback on allowed and disallowed design features in synthetic genomes.

Main Methods:

  • Utilized CRISPR/Cas9 for in vivo excision of double-stranded DNA from an episomal replicon.
  • Employed lambda-red-mediated recombination with simultaneous positive and negative selection for stepwise genome replacement.
  • Applied eight synonymous recoding schemes to an essential operon for systematic genome recoding.

Main Results:

  • Demonstrated a system for efficient, programmable replacement of genomic DNA with long (>100-kb) synthetic DNA.
  • Established a basis for stepwise whole-genome replacement in Escherichia coli.
  • Defined allowed and disallowed synonymous recoding schemes and identified idiosyncratic recoding positions.

Conclusions:

  • The developed system facilitates efficient and programmable synthetic genome engineering.
  • This work provides crucial insights into synonymous codon usage and genome design rules.
  • Enables identification and repair of recoding errors for future synthetic genome applications.