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From DNA to Protein

From DNA to Protein

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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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: Mar 14, 2026

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Published on: December 9, 2017

Genomics: Evolution of the Genetic Code.

Patrick J Keeling¹

¹Canadian Institute for Advanced Research, Botany Department, University of British Columbia, 3529-6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada.

Current Biology : CB

|September 28, 2016

Summary

This summary is machine-generated.

The genetic code, essential for life, has rare variations indicating evolutionary pressures. New findings suggest the code evolves through ambiguous stages and that gene termination depends on surrounding genetic context.

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Last Updated: Mar 14, 2026

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Area of Science:

Molecular Biology
Genetics
Evolutionary Biology

Background:

The genetic code is the set of rules by which information encoded in genetic material (DNA or RNA sequences) is translated into proteins by living cells.
While largely universal, rare variations in the genetic code exist across different organisms, suggesting ongoing evolution and adaptation.
Understanding these variations provides insights into the selective pressures acting on the code and the translation machinery.

Purpose of the Study:

To explore the evolutionary dynamics of the genetic code.
To investigate the mechanisms by which the genetic code might change over time.
To examine the role of context-dependent factors in genetic translation and termination.

Main Methods:

Analysis of existing genetic code variation data.
Bioinformatic approaches to model potential evolutionary pathways.
Examination of sequence context surrounding translation termination sites.

Main Results:

Evidence suggests that changes in the genetic code may proceed through intermediate stages of ambiguity.
The process of translation termination is not absolute and appears to be influenced by the surrounding nucleotide sequence.
These findings highlight the plasticity and adaptability of the genetic code and its associated machinery.

Conclusions:

The genetic code is a dynamic entity, subject to evolutionary modification.
Ambiguous intermediates may play a crucial role in the evolution of the genetic code.
Context-dependent termination provides a mechanism for fine-tuning gene expression and adapting the code.