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Related Experiment Video

Updated: Dec 2, 2025

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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Resource conservation manifests in the genetic code.

Liat Shenhav1,2, David Zeevi3

  • 1Center for Studies in Physics and Biology, Rockefeller University, New York, NY, USA.

Science (New York, N.Y.)
|November 6, 2020
PubMed
Summary
This summary is machine-generated.

Microbial competition for nutrients shapes genetic code. This resource conservation, driven by nitrogen availability, offers mutation protection across life, including humans.

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Area of Science:

  • Microbial Ecology
  • Molecular Evolution
  • Bioinformatics

Background:

  • Nutrient limitation is a major driver of competition among organisms.
  • The impact of nutrient availability on microbial coding sequences remains largely unexplored.
  • Understanding selective pressures on genetic sequences is crucial for evolutionary biology.

Purpose of the Study:

  • To investigate how nutrient limitation influences the evolution of microbial coding sequences.
  • To identify the role of environmental factors, particularly nitrogen availability, in shaping genetic selection.
  • To determine if the genetic code's structure provides robustness against resource-driven mutations.

Main Methods:

  • Analysis of metagenomic and single-cell data from marine microbes.
  • Integration of environmental measurements, focusing on nutrient availability.
  • Examination of the standard genetic code's structure and codon usage patterns.

Main Results:

  • A substantial portion of selection on microbial genomes is environmentally driven and linked to nitrogen availability.
  • The genetic code exhibits inherent robustness against mutations that enhance carbon and nitrogen content in proteins.
  • This protective mechanism is conserved across diverse taxa, from microbes to the human genome.

Conclusions:

  • Resource-driven selection, especially concerning nitrogen, significantly impacts microbial genome evolution.
  • The standard genetic code's design inherently confers mutational robustness, conserving essential elements.
  • These findings reveal a fundamental link between environmental nutrient levels and the evolutionary optimization of the genetic code across all domains of life.