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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...

Mutations

Mutations

Mutations

Mutations

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.

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...

Mismatch Repair

Mismatch Repair

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Related Experiment Video

Updated: Jun 24, 2026

Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

Published on: September 13, 2024

Compensatory mutations are repeatable and clustered within proteins.

Brad H Davis¹, Art F Y Poon, Michael C Whitlock

¹Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4. davi1847@umn.edu

Proceedings. Biological Sciences

|March 28, 2009

Summary

This summary is machine-generated.

Compensatory mutations, which restore fitness lost by deleterious mutations, do not occur randomly. Their locations in gene sequences are predictable, suggesting convergent evolution in proteins.

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Area of Science:

Genetics and Evolutionary Biology
Molecular Biology
Biophysics

Background:

Deleterious mutations reduce organismal fitness.
Compensatory mutations can restore fitness in the presence of deleterious mutations.
Epistasis describes gene interactions, with compensatory mutations being a specific type.

Purpose of the Study:

To investigate the non-random occurrence of intragenic compensatory mutations.
To determine if the location of compensatory mutations is predictable.
To explore potential patterns in compensatory evolution at the protein level.

Main Methods:

Analysis of mutation patterns within gene sequences.
Statistical assessment of mutation site distribution.
Examination of protein regions associated with compensatory mutations.

Main Results:

Intragenic compensatory mutations occur non-randomly across gene sequences.
Specific sites are more prone to compensatory mutations.
Compensatory mutations show a tendency to cluster near the original deleterious mutation site.
Certain protein regions are disproportionately affected by compensatory mutations.

Conclusions:

Compensatory evolution in proteins is partially predictable.
The spatial distribution of compensatory mutations suggests convergent evolutionary patterns.
Understanding these patterns can offer insights into protein evolution and adaptation.