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Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Evolution of Microbial Genome

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

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 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...

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

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Related Experiment Video

Updated: Jun 21, 2026

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing

Published on: July 28, 2017

[Recent progress in plant genome size evolution].

Jian-Jun Chen¹, Ying Wang

¹Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China. jianjunchen@wbgcas.cn

Yi Chuan = Hereditas

|July 10, 2009

Summary

This summary is machine-generated.

Plant genome size varies greatly due to polyploidy and transposable elements (TEs). DNA loss mechanisms like recombination balance expansion, but genomes generally trend larger.

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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:

Genomics
Evolutionary Biology
Plant Science

Background:

Eukaryotic genome sizes vary significantly, irrespective of organism complexity.
Genome size variation is largely attributed to polyploidy and non-coding DNA, particularly transposable elements (TEs).

Purpose of the Study:

To review current knowledge on plant genome size variation.
To explore the evolutionary forces driving genome expansion and contraction in plants.

Main Methods:

Literature review of studies on plant genome size variation.
Analysis of mechanisms contributing to genome size changes.

Main Results:

Polyploidization and transposable element accumulation are key drivers of genome expansion.
Unequal homologous and illegitimate recombination act as counterbalances to genome expansion by facilitating DNA loss.
Evolutionary trends suggest a bias towards larger plant genomes, with deletion mechanisms primarily attenuating rather than reversing expansion.

Conclusions:

Plant genome size is dynamically regulated by opposing forces of expansion (polyploidy, TEs) and contraction (recombination-mediated DNA loss).
The net evolutionary direction favors larger genomes, indicating that expansionary forces often outweigh contractionary ones over evolutionary time.