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Related Experiment Video

Updated: Jun 13, 2026

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

Published on: August 1, 2016

Dual functions of codons in the genetic code.

Alexey V Lobanov¹, Anton A Turanov, Dolph L Hatfield

¹Division of Genetics, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.

Critical Reviews in Biochemistry and Molecular Biology

|May 8, 2010

Summary

This summary is machine-generated.

The genetic code, fundamental to molecular biology, exhibits surprising flexibility. Recent findings reveal codons can have dual functions, influenced by RNA structures, expanding our understanding of genetic language evolution.

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Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

The genetic code is a cornerstone of molecular biology, with most organisms sharing a common genetic language.
Known variations include codon reassignments in specific organisms and organelles, and dual roles for certain codons like AUG, UGA, UAG, and CUG.
These variations highlight the adaptability of the genetic code beyond its universal application.

Purpose of the Study:

To investigate the extent of codon function duality within the genetic code.
To explore novel mechanisms that might regulate or enable codon reassignment.
To understand the implications of codon duality for the evolution of the genetic code.

Main Methods:

Analysis of recent studies on codon function and regulation.
Examination of the role of RNA structures, specifically stem-loop elements in 3'-untranslated regions.
Comparative genomics and bioinformatics approaches to identify potential recoding events.

Main Results:

Codons at any position within an open reading frame can possess dual functions.
The availability of specific RNA stem-loop structures in the 3'-untranslated region can alter codon meaning.
This mechanism demonstrates a broader application of codon duality than previously recognized.

Conclusions:

Duality of codon function is a more prevalent feature of the genetic code than previously understood.
The discovery suggests that additional recoding events and novel features may have evolved within the genetic code.
This expands the potential for genetic innovation and complexity in biological systems.