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

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

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...

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...

Horizontal Gene Transfer

Horizontal Gene Transfer

Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...

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Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing

Published on: July 7, 2020

Helitrons on a roll: eukaryotic rolling-circle transposons.

Vladimir V Kapitonov¹, Jerzy Jurka

¹Genetic Information Research Institute, 1925 Landings Drive, Mountain View, CA 94043, USA. vladimir@girinst.org

Trends in Genetics : TIG

|September 14, 2007

Summary

Helitron transposons, a type of eukaryotic mobile genetic element, are found across diverse species. These elements play a significant role in genome evolution by capturing host genes.

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Area of Science:

Genetics
Molecular Biology
Evolutionary Biology

Background:

Helitron transposons are a distinct class of eukaryotic mobile genetic elements.
First identified in plants and nematodes, Helitrons are now recognized in a wide array of organisms, including mammals.
They differ structurally and mechanistically from classical transposons.

Purpose of the Study:

To highlight the broad distribution of Helitron transposons across eukaryotic domains.
To emphasize the unique characteristics of Helitrons compared to other transposon classes.
To underscore the significant role of Helitrons in host genome evolution.

Main Methods:

Comparative genomics to identify Helitron elements across diverse species.
Phylogenetic analysis to understand Helitron evolution and distribution.
Molecular studies to elucidate Helitron transposition mechanisms.

Main Results:

Helitrons have been identified in a wide range of eukaryotic species, from protists to mammals.
Helitrons exhibit unique structural and transpositional mechanisms distinct from classical transposons.
Evidence suggests Helitrons actively capture host genes during transposition.

Conclusions:

Helitron transposons are a major and widespread class of eukaryotic mobile elements.
Their distinct mechanisms and gene-capturing ability significantly impact host genome evolution.
Further research into Helitrons can reveal novel insights into genome dynamics and evolution.