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Updated: Jan 21, 2026

Optical Control of a Neuronal Protein Using a Genetically Encoded Unnatural Amino Acid in Neurons
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Molecular Complexity Constrained Early Amino Acid Recruitment into the Genetic Code.

Syeda Ameena Hashmi1, Hamed Chok1, Ricardo Cabrera2

  • 1Blue Marble Space Institute of Science, Seattle, WA 98104, USA.

Genome Biology and Evolution
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

This study reveals molecular complexity as a key factor in the genetic code's evolution, showing simple amino acids were incorporated first. This complexity influenced early protein evolution and genetic pathways.

Keywords:
amino acid chronologygenetic code evolutiongraph theory applicationsmolecular complexitymolecular evolution

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Astrobiology

Background:

  • Existing genetic code chronologies often rely on external factors like synthesis experiments or genomic data.
  • The influence of intrinsic molecular properties on amino acid recruitment is not well understood.

Purpose of the Study:

  • To reconstruct an amino acid chronology based on intrinsic molecular complexity.
  • To investigate the role of molecular complexity in shaping the genetic code's evolution.
  • To explore universal principles in biochemical evolution.

Main Methods:

  • Integrated sixteen molecular complexity metrics from chemical graph and information theory.
  • Constructed a minimum spanning tree to represent complexity-based relationships between amino acids.
  • Analyzed mutational connectivity and correlation with the Last Universal Common Ancestor's (LUCA) proteome.

Main Results:

  • A complexity-based hierarchy emerged, with simple amino acids preceding complex ones, aligning with other chronologies.
  • Amino acids with similar complexity showed higher mutational connectivity.
  • Molecular complexity correlated with amino acid enrichment in LUCA's inferred proteome.

Conclusions:

  • Intrinsic molecular properties, specifically complexity, played a fundamental role in shaping the genetic code.
  • The genetic code evolved to balance stability with complexity-preserving substitutions.
  • Molecular complexity offers a universal principle for understanding early protein evolution.