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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...

Gene Families

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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
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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.

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Related Experiment Video

Updated: Mar 19, 2026

Co-expression of Multiple Chimeric Fluorescent Fusion Proteins in an Efficient Way in Plants

Co-expression of Multiple Chimeric Fluorescent Fusion Proteins in an Efficient Way in Plants

Published on: July 1, 2018

Evolution of Gene Duplication in Plants.

Nicholas Panchy¹, Melissa Lehti-Shiu¹, Shin-Han Shiu²

¹Genetics Program (N.P., S.-H.S.) and Department of Plant Biology (M.L.-S., S.-H.S.), Michigan State University, East Lansing, Michigan 48824.

Plant Physiology

|June 12, 2016

Summary

Gene duplication in plants drives the evolution of new traits and crop improvements. Understanding these events is key for future plant and crop research.

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Area of Science:

Plant genomics
Evolutionary biology
Molecular genetics

Background:

Gene duplication is a major source of genetic novelty in plant genomes.
Duplicate genes contribute to the evolution of diverse functions, including stress adaptation and floral development.
Recent whole-genome duplications in crops like wheat and soybean impact agronomic traits.

Purpose of the Study:

To review current knowledge on gene duplication in plants.
To explore mechanisms, fates, and retention models of duplicate genes.
To highlight the evolutionary impact of gene duplication on plant evolution and crop improvement.

Main Methods:

Literature review of gene duplication studies in plants.
Synthesis of information on duplication mechanisms and evolutionary consequences.
Analysis of models for duplicate gene retention and functional divergence.

Main Results:

Ancient and recent duplication events have shaped plant genomes.
Duplicate genes provide raw material for novel functions and adaptation.
Understanding duplication is crucial for crop breeding and genetic improvement.

Conclusions:

Gene duplication is a fundamental evolutionary process in plants.
It significantly contributes to plant diversity and agricultural productivity.
Further research into gene duplication mechanisms and impacts is vital for future plant science.