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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...

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...

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...

Non-LTR Retrotransposons

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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...

LTR Retrotransposons

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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.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...

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TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...

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Related Experiment Video

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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

The necessary junk: new functions for transposable elements.

Alysson R Muotri¹, Maria C N Marchetto, Nicole G Coufal

¹1-Laboratory of Genetics, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.

Human Molecular Genetics

|October 4, 2007

Summary

Transposable elements actively shape genomes, creating new genes and regulatory systems. These mobile elements drive genetic variation and demonstrate that genomes are dynamic, not static.

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Area of Science:

Genomics
Evolutionary Biology
Molecular Biology

Background:

Transposable elements (TEs) have historically influenced genome evolution, contributing to gene creation and regulatory networks.
A small subset of TE families remains active in modern animal and plant genomes, with significant genetic implications.
TE mobilization in germ, stem, or somatic cells can lead to genetic diversity and epigenetic alterations during development.

Purpose of the Study:

To review recent findings on the role of transposable elements in generating genetic variation.
To highlight the dynamic nature of the genome influenced by active TEs.
To underscore the underestimated genetic impact of currently active mobile elements.

Main Methods:

Literature review of recent observations and studies on transposable elements.
Synthesis of data on TE activity and its effects on genome structure and gene regulation.
Analysis of the evolutionary and developmental consequences of TE-mediated genetic changes.

Main Results:

Active transposable elements contribute to the continuous shaping of genomes.
TEs generate novel genetic variations by altering gene expression and genomic structure.
Mobilization of TEs in various cell types impacts genetic makeup and epigenetic regulation.

Conclusions:

Transposable elements are a significant source of ongoing genetic variation.
The genome is a dynamic entity, constantly influenced by active mobile elements.
A deeper appreciation of TEs is necessary to understand genome evolution and plasticity.