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Mutations

Mutations

Gene Evolution - Fast or Slow?

Gene Evolution - Fast or Slow?

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.
In contrast, regions which code...

Gene Duplication and Divergence

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...

Synteny and Evolution

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral...

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...

Gene Conversion

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

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Related Experiment Video

Updated: May 22, 2025

In Vivo Modeling of the Morbid Human Genome using Danio rerio

In Vivo Modeling of the Morbid Human Genome using Danio rerio

Published on: August 24, 2013

Functional synonymous mutations and their evolutionary consequences.

Jianzhi Zhang¹, Wenfeng Qian^2,3

¹Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, USA. jianzhi@umich.edu.

Nature Reviews. Genetics

|May 20, 2025

Summary

This summary is machine-generated.

Synonymous mutations, once thought neutral, can impact gene expression and fitness. This review explores their functional roles and non-neutral effects in genetics and evolution.

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Area of Science:

Genetics and Evolutionary Biology
Molecular Biology

Background:

Synonymous mutations, which do not change amino acid sequences, were historically considered neutral.
They have been extensively utilized in evolutionary studies, underpinning the neutral theory.
Emerging evidence challenges this view, indicating significant functional roles.

Purpose of the Study:

To review the functional consequences and fitness effects of synonymous mutations.
To explore the mechanisms by which these mutations influence gene expression.
To discuss the implications of synonymous mutation functionality for genetics, evolution, conservation, and disease.

Main Methods:

Literature review of recent studies on synonymous mutations.
Analysis of mechanisms affecting gene expression (e.g., transcription, splicing, translation).
Evaluation of phenotypic and fitness consequences.

Main Results:

Synonymous mutations can affect multiple stages of gene expression.
These mutations can lead to significant phenotypic and fitness variations, often being non-neutral.
Evidence supports roles in processes like mRNA stability, translation efficiency, and protein folding.

Conclusions:

Synonymous mutations are not functionally neutral and can have substantial impacts.
Their non-neutrality necessitates re-evaluation of their use in evolutionary and genetic analyses.
Understanding these effects is crucial for fields ranging from molecular genetics to disease research and conservation efforts.