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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...

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...

Cis-regulatory Sequences

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...

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...

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Related Experiment Video

Updated: Jul 3, 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

Transposable elements donate lineage-specific regulatory sequences to host genomes.

L Mariño-Ramírez¹, K C Lewis, D Landsman

¹National Center for Biotechnology Information, National Institutes of Health, Bethesda, MD 20894, USA.

Cytogenetic and Genome Research

|August 12, 2005

Summary

Transposable elements (TEs) significantly impact gene regulation and genome evolution. Their lineage-specific nature drives evolutionary diversification of regulatory sequences between species.

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Area of Science:

Evolutionary biology
Genomics
Molecular biology

Background:

Transposable elements (TEs) are mobile genetic sequences with profound evolutionary implications.
Historically, TEs were recognized for their mobility, with early research hinting at their role in genome evolution.

Purpose of the Study:

To explore the evolutionary significance of transposable element (TE) impacts on gene regulation.
To review evidence supporting TEs' role in host gene regulation and their lineage-specific characteristics.

Main Methods:

Historical perspective on TE discovery and conceptualization.
Review of evidence for TEs influencing host gene regulation.
Comparative genomics to assess TE lineage specificity.

Main Results:

TEs play a crucial role in host gene regulation.
TEs are highly specific to particular evolutionary lineages.
Human-mouse genome comparisons show TE-derived regulatory sequences are exceptionally lineage-specific.

Conclusions:

TEs contribute lineage-specific regulatory sequences.
This TE-driven regulatory diversification may drive evolutionary divergence between lineages.