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Related Concept Videos

From DNA to Protein03:06

From DNA to Protein

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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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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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The Central Dogma

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Overview
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The Central Dogma01:20

The Central Dogma

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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
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tRNA Activation02:26

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Related Experiment Video

Updated: Apr 20, 2026

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

Pál Venetianer

    Biomolecular Concepts
    |December 2, 2014
    PubMed
    Summary

    Synonymous codon usage affects gene expression and organism fitness, challenging the notion of neutral evolution. This review details how codon changes influence individual gene expression through various mechanisms.

    Area of Science:

    • Molecular Biology
    • Evolutionary Biology
    • Genetics

    Background:

    • Synonymous codon usage and tRNA abundance vary across species.
    • These factors can impact protein synthesis rates and efficiency.
    • Synonymous mutations may influence organism fitness, not always being evolutionarily neutral.

    Purpose of the Study:

    • To review the influence of synonymous codon replacements on individual gene expression.
    • To describe the mechanisms behind these effects.
    • To provide examples illustrating these mechanisms.

    Main Methods:

    • Literature review of existing research on synonymous codon usage.
    • Analysis of proposed mechanisms for codon-influenced gene expression.
    • Compilation of experimental and observational examples.

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    Related Experiment Videos

    Last Updated: Apr 20, 2026

    Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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    Published on: August 1, 2016

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    An Integrated Approach for Microprotein Identification and Sequence Analysis
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    An Integrated Approach for Microprotein Identification and Sequence Analysis

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    Main Results:

    • Synonymous codon substitutions can significantly alter gene expression levels.
    • Mechanisms include translational efficiency, mRNA stability, and co-translational folding.
    • Examples demonstrate context-specific effects of codon bias.

    Conclusions:

    • Synonymous codon usage is a critical factor in gene expression regulation.
    • These effects have implications for understanding evolutionary processes.
    • Further research is needed to fully elucidate the impact of codon bias on biological systems.