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Genome Copying Errors

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.

Transfer RNA Synthesis

Transfer RNA Synthesis

Transfer RNA Synthesis

Transfer RNA Synthesis

One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...

Translation

Translation

Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...

Translation

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...

Improving Translational Accuracy

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...

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Related Experiment Video

Updated: Apr 18, 2026

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Published on: September 13, 2018

Lost in transcription: transient errors in information transfer.

Alasdair J E Gordon¹, Dominik Satory¹, Jennifer A Halliday¹

¹Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.

Current Opinion in Microbiology

|February 1, 2015

Summary

This summary is machine-generated.

Transcription errors, or epimutations, can alter cell phenotypes. New sequencing methods directly measure these errors, revealing their impact on gene expression and cell behavior.

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Toeprinting Analysis of Translation Initiation Complex Formation on Mammalian mRNAs

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Area of Science:

Molecular Biology
Genetics
Epigenetics

Background:

Information transfer from DNA to RNA to protein is prone to errors.
Epimutations, errors during transcription, are a key focus in understanding cellular processes.
Previous methods lacked direct quantification of transcription error rates.

Purpose of the Study:

To directly determine the rate of epimutation during transcription.
To analyze the spectrum of transcription errors, including their type and sequence context.
To assess the phenotypic consequences of transcription errors.

Main Methods:

Utilizing novel cDNA library preparation techniques.
Employing next-generation sequencing for high-throughput error analysis.
Implementing forward and reverse epimutation systems to study phenotypic effects.

Main Results:

Established direct measurement of epimutation rates.
Characterized the epimutational spectrum of transcription errors.
Demonstrated that transcription errors can modify cell phenotype, suppress mutant alleles, and induce heritable epigenetic switching.

Conclusions:

Transcription errors are quantifiable and have significant phenotypic consequences.
Epimutations can lead to both transient and heritable changes in cell phenotype.
These findings provide new insights into the role of transcription fidelity in cellular function and inheritance.