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Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

Point and Frameshift Mutations

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...

Mutations in Microorganisms

Mutations in Microorganisms

Mutations are heritable changes in an organism’s genome involving alterations in the base sequence of DNA or RNA. These changes can influence cellular processes and phenotypic traits, potentially transforming the unaltered wild type into a mutant form. Such changes, termed forward mutations, are pivotal in shaping the genetic diversity of organisms.RNA viruses exhibit the highest mutation rates due to the absence of robust proofreading mechanisms during genome replication. In contrast,...

Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

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.

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Related Experiment Video

Updated: Sep 27, 2025

The Lambda Select cII Mutation Detection System

The Lambda Select cII Mutation Detection System

Published on: April 26, 2018

A frameshift in time.

Martina M Yordanova¹, Pavel V Baranov¹

¹School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland.

|April 11, 2022

Summary

This summary is machine-generated.

Ribosome frameshifting efficiency during viral RNA decoding can change as an infection progresses. This dynamic process impacts viral replication and host-pathogen interactions.

Keywords:

PRRSV arterivirus chromosomes gene expression infectious disease microbiology porcine reproductive programmed ribosomal frameshifting respiratory syndrome virus ribosome profiling subgenomic mRNAs viruses

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Last Updated: Sep 27, 2025

The Lambda Select cII Mutation Detection System

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Published on: April 26, 2018

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Area of Science:

Molecular Biology
Virology
Genetics

Background:

Ribosomes translate messenger RNA (mRNA) into proteins.
Ribosome frameshifting is a mechanism where ribosomes move -1 or +1 nucleotide during translation, altering the reading frame.
This process is crucial for the expression of many viral genomes.

Discussion:

The efficiency of ribosomal frameshifting on viral RNA is not static.
Changes in frameshifting efficiency may occur dynamically throughout the course of a viral infection.
This dynamic modulation could be a strategy employed by viruses to alter protein expression or evade host immune responses.

Key Insights:

Viral RNA decoding by ribosomes involves frameshifting.
The efficiency of this frameshifting can be variable and change over infection time.
Understanding these dynamics is key to comprehending viral life cycles.

Outlook:

Further research is needed to elucidate the mechanisms driving changes in frameshifting efficiency.
Investigating these dynamics could reveal new targets for antiviral therapies.
This area of study holds potential for understanding host-virus interactions at a molecular level.