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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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Robust genetic codes enhance protein evolvability.

Hana Rozhoňová1,2, Carlos Martí-Gómez3, David M McCandlish3

  • 1Institute of Integrative Biology, ETH Zürich, Zürich, Switzerland.

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|May 16, 2024
PubMed
Summary
This summary is machine-generated.

The standard genetic code

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Synthetic Biology

Background:

  • The standard genetic code dictates protein translation and influences protein evolvability.
  • The code's robustness to mutation is a key feature, but its effect on evolvability is debated.

Purpose of the Study:

  • To investigate how genetic code rewiring impacts protein evolvability.
  • To determine if robust genetic codes enhance or hinder adaptive evolution.

Main Methods:

  • Analysis of empirical adaptive landscapes using massively parallel sequence-to-function assays.
  • Construction and examination of hundreds of thousands of rewired genetic codes, including codon compression schemes.

Main Results:

  • Robust genetic codes generally enhance protein evolvability by creating smoother adaptive landscapes.
  • The standard genetic code is not exceptional; many alternative codes yield smoother landscapes.
  • Rewired codes significantly alter the topology of high-fitness genotype networks.

Conclusions:

  • Alternative genetic codes can be engineered for enhanced or diminished protein evolvability.
  • Findings offer design principles for directed protein evolution and bio-containment of synthetic organisms.