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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.

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 has three reading...

Organization of Genes

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From DNA to Protein

From DNA to Protein

The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...

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Updated: May 20, 2026

Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos

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Published on: June 6, 2016

Novel genes from formation to function.

Rita Ponce¹, Lene Martinsen, Luís M Vicente

¹Centro de Biologia Ambiental (CBA), Faculdade de Ciências da Universidade de Lisboa, 1749 Lisboa, Portugal.

International Journal of Evolutionary Biology

|July 20, 2012

Summary

This summary is machine-generated.

Novel gene evolution involves new coding sequences, regulatory regions, and organismal effects. The Sdic gene cluster provides a model for studying recent, rapidly evolving genes and their functional emergence.

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Area of Science:

Evolutionary genetics
Molecular biology
Genomics

Background:

Gene evolution studies traditionally emphasize coding sequence formation.
Regulatory region evolution and functional effects are crucial but less studied aspects of novel gene emergence.
Recent gene duplications offer insights into ongoing evolutionary processes.

Purpose of the Study:

To review current knowledge on novel functional gene evolution.
To examine the youngest discovered genes, focusing on regulatory aspects and organismal effects.
To analyze the Sdic gene cluster as a model for recent gene evolution.

Main Methods:

Literature review of novel gene evolution.
Analysis of existing data on recently evolved gene clusters.
Case study of the Sdic gene cluster.

Main Results:

Novel gene evolution encompasses coding sequences, regulatory elements, and phenotypic impact.
The Sdic gene cluster represents a young, dynamic set of duplicated genes.
This cluster serves as a valuable model for observing gene evolution in action.

Conclusions:

A comprehensive view of gene evolution must include regulatory and functional aspects.
The Sdic gene cluster is a prime example of recent evolutionary innovation.
Further research on such clusters can elucidate mechanisms of novel gene adaptation.