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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

Exon Recombination

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...

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.
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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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Updated: Feb 26, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Published on: February 3, 2023

Gene Evolution: Getting Something from Nothing.

Caroline M Weisman¹, Sean R Eddy¹

¹HHMI & Harvard University, Cambridge, MA 02138, USA.

Current Biology : CB

|July 12, 2017

Summary

This summary is machine-generated.

New genes can emerge from existing ones or entirely new DNA sequences. A study found that 25% of random DNA sequences surprisingly produced beneficial products in bacteria.

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An Integrated Approach for Microprotein Identification and Sequence Analysis

An Integrated Approach for Microprotein Identification and Sequence Analysis

Published on: July 12, 2022

Area of Science:

Genetics
Molecular Biology
Synthetic Biology

Background:

Gene duplication and divergence are primary mechanisms for new gene evolution.
The potential for de novo gene formation from non-genic sequences remains an area of active research.

Purpose of the Study:

To investigate the frequency of beneficial gene emergence from random DNA sequences.
To assess the potential of non-genic DNA to yield functional and advantageous genetic elements.

Main Methods:

Random DNA sequences were generated and cloned into bacterial expression vectors.
These sequences were expressed in a bacterial host system.
The resulting protein products were screened for beneficial functions or properties.

Main Results:

A significant proportion, 25%, of randomly generated DNA sequences yielded expressed products with beneficial effects in bacteria.
This suggests a higher than expected rate of functional gene discovery from non-coding or random DNA.

Conclusions:

De novo gene origin from non-genic sequences is a plausible and potentially frequent evolutionary pathway.
Random DNA possesses a substantial capacity to generate novel, beneficial genetic functions, challenging traditional views of gene evolution.