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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...

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...

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Related Experiment Video

Updated: May 14, 2025

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

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

Published on: July 27, 2019

Massively parallel jumping assay decodes Alu retrotransposition activity.

Navneet Matharu^1,2, Jingjing Zhao^3,4, Ajuni Sohota^3,4

¹Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA. nkmatharu@gmail.com.

Nature Communications

|May 9, 2025

Summary

This summary is machine-generated.

Scientists developed a new assay to test thousands of retrotransposon variants for their jumping activity. This research identifies specific nucleotide changes and RNA structures crucial for retrotransposon reactivation in the human genome.

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Last Updated: May 14, 2025

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

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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

Area of Science:

Genomics
Molecular Biology
Epigenetics

Background:

The human genome harbors millions of silenced retrotransposons.
Mutations in these retrotransposons can lead to reactivation, potentially causing disease.
Understanding how nucleotide changes affect retrotransposon activity is crucial.

Purpose of the Study:

To develop a high-throughput assay for assessing retrotransposon jumping potential.
To identify specific nucleotide variants and structural features that influence retrotransposon transposition.
To investigate the reactivation potential of human retrotransposons.

Main Methods:

Development of a massively parallel jumping assay (MPJA).
Creation of a nucleotide variant library of four Alu retrotransposons (165,087 haplotypes).
Testing thousands of retrotransposon variants for jumping ability using MPJA.

Main Results:

Identified 66,821 unique jumping retrotransposon haplotypes.
Pinpointed critical domains and variants essential for transposition.
Mapped variants to Alu-RNA secondary structure, revealing stem-loop features influencing jumping potential.

Conclusions:

The developed MPJA is a powerful tool for assessing retrotransposon jumping.
Specific nucleotide changes and RNA structures are vital for retrotransposon activity.
This work identifies potential reactivators of retrotransposons in the human genome.