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Overview of Transposition and Recombination

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...

Transposons

Transposons

Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...

DNA-only Transposons

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...

LTR Retrotransposons

LTR Retrotransposons

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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Non-LTR Retrotransposons

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...

Transgenic Plants

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Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
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Related Experiment Video

Updated: Jul 2, 2026

Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

Published on: January 20, 2023

Plant transposable elements.

J M Deragon¹, J M Casacuberta, O Panaud

¹CNRS UMR6547 BIOMOVE, Université Blaise Pascal, Aubière, France.

Genome Dynamics

|August 30, 2008

Summary

This summary is machine-generated.

Transposable elements (TEs) significantly impact plant genome structure and gene expression, driving natural variation. Understanding TEs is crucial for deciphering plant genome regulation and evolution in the post-genomics era.

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Area of Science:

Plant genomics
Molecular biology
Evolutionary genetics

Background:

Genomic programs generate vast plant genome data, necessitating understanding of gene expression variation.
Natural variation in gene expression across populations and under stress is key for post-genomics progress.
Transposable elements (TEs) constitute a large portion of plant genomes, influencing genome structure and regulation.

Purpose of the Study:

To elucidate the mechanisms behind natural variation in plant gene expression.
To define the role of transposable elements (TEs) in plant genome structure, evolution, and gene expression.
To provide examples of TE contributions to plant genome regulation and phenotypic diversity.

Main Methods:

Review of existing genomic data and literature on plant transposable elements.
Analysis of case studies demonstrating TE impact on genome structure and gene expression.
Comparative genomics approaches to study TE distribution and activity.

Main Results:

Transposable elements (TEs) are major drivers of genome structure evolution in plants.
TEs significantly influence gene expression patterns, contributing to phenotypic variation.
Specific TE types and their insertion patterns correlate with altered gene regulation.

Conclusions:

Understanding transposable elements is fundamental to interpreting plant genome function and evolution.
TEs play a critical role in shaping the genetic architecture and adaptability of plant genomes.
Further research into TEs will unlock insights into plant responses to environmental changes and crop improvement.