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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.
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Overview of Transposition and Recombination

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Related Experiment Video

Updated: Jun 11, 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

LINE-1 retrotransposition activity in human genomes.

Christine R Beck¹, Pamela Collier, Catriona Macfarlane

¹Department of Human Genetics, University of Michigan Medical School, Ann Arbor, MI 48109, USA. cregina@umich.edu <cregina@umich.edu>

|July 7, 2010

Summary

Highly active long interspersed element-1 (LINE-1 or L1) sequences are more common in human populations than previously thought. Ongoing L1 retrotransposition significantly contributes to genetic diversity among individuals.

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Analysis of LINE-1 Retrotransposition at the Single Nucleus Level

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RNA Next-Generation Sequencing and a Bioinformatics Pipeline to Identify Expressed LINE-1s at the Locus-Specific Level

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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

Area of Science:

Genomics
Molecular Biology
Human Genetics

Background:

Long interspersed element-1 (LINE-1 or L1) sequences are major drivers of retrotransposition in the human genome.
The population-level abundance of highly active (hot) L1 elements is not well understood.

Purpose of the Study:

To investigate the prevalence and activity of full-length, non-reference long interspersed element-1 (L1) sequences in the human population.
To determine the contribution of L1 retrotransposition to human genetic variation.

Main Methods:

Employed a fosmid-based, paired-end DNA sequencing strategy to identify full-length L1 elements.
Utilized a cultured cell retrotransposition assay to assess L1 activity.
Performed genotyping on specific L1 elements across diverse human populations.

Main Results:

Identified 68 full-length L1 elements absent from the human genome reference sequence.
The majority of identified L1s demonstrated high activity in retrotransposition assays.
Genotyping revealed population-specific distribution of certain L1 elements, with some unique to African populations.

Conclusions:

Hot L1 elements are more abundant in the human population than previously recognized.
Continuous L1 retrotransposition is a significant source of interindividual genetic variation.
L1 elements contribute to the genetic diversity observed across human populations.