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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...

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...

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...

Retroviruses

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...

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Related Experiment Video

Updated: May 13, 2026

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level

Analysis of LINE-1 Retrotransposition at the Single Nucleus Level

Published on: April 23, 2016

Tandem repeats derived from centromeric retrotransposons.

Anupma Sharma, Thomas K Wolfgruber, Gernot G Presting

|March 5, 2013

Summary

This summary is machine-generated.

Novel tandem repeats in maize centromeres originated from retrotransposons. Gene conversion drives sequence variation and expansion of these DNA elements, shedding light on genome evolution.

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Detection of Retrotransposition Activity of Hot LINE-1s by Long-Distance Inverse PCR

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Published on: July 27, 2019

Area of Science:

Genomics
Molecular Evolution

Background:

Tandem repeats are abundant in eukaryotic genomes, particularly at centromeres.
Centromeric retrotransposons (CR), a type of Ty3/gypsy retrotransposon, are enriched in maize centromeres.
The origin and evolution of tandem repeat loci remain largely unknown.

Purpose of the Study:

To investigate the origin and evolution of novel tandem repeats in maize centromeres.
To determine the relationship between centromeric retrotransposons and tandem repeat formation.

Main Methods:

Identification and characterization of novel tandem repeats (CRM1TR and CRM4TR).
Comparative sequence analysis of repeat monomers and their parent retrotransposon elements.
Estimation of repeat amplification times using retrotransposon insertion data.

Main Results:

Two novel tandem repeats, CRM1TR and CRM4TR, were identified and shown to be derived from CR elements.
These repeats originated from similar regions (LTR and UTR) of their parent retrotransposons in at least two separate events.
Repeat amplification began ~4 (CRM1TR) and ~1 (CRM4TR) million years ago; distinct variants exist at different CRM1TR loci.

Conclusions:

Retrotransposons can generate novel tandem repeats in eukaryotic genomes.
Gene conversion is the primary mechanism driving sequence variation within CRM1TR loci.
Intrastrand deletions likely initiated repeat structures, followed by gene conversion-mediated expansion.