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Overview of Transposition and Recombination

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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...

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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.
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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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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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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity

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The evolutionary dynamics of transposable elements in eukaryote genomes.

M Tollis¹, S Boissinot

¹Department of Biology, Queens College, The City University of New York, Flushing, NY, USA.

Genome Dynamics

|July 5, 2012

Summary

Transposable elements (TEs) significantly impact eukaryotic genomes. Genomic architecture is shaped by TE transposition, selection, and population genetics, with drift playing a crucial role.

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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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Published on: May 19, 2019

Area of Science:

Genomics
Population Genetics
Molecular Biology

Background:

Transposable elements (TEs) are mobile genetic sequences found in all eukaryotic genomes.
TEs influence genome size, structure, and function, with significant variations observed across eukaryotes.
No clear correlation exists between organismal complexity and TE abundance or diversity.

Purpose of the Study:

To investigate the factors shaping the diversity and abundance of transposable elements in eukaryotic genomes.
To understand the interplay between transposition rates, selection pressures, population demographics, and DNA loss in TE dynamics.
To elucidate the role of genetic drift versus selection in the genomic distribution of TEs.

Main Methods:

Comparative genomics analysis across diverse eukaryotic taxa.
Population genetics modeling to assess selection efficacy against new TE insertions.
Analysis of demographic history and DNA loss rates in relation to TE profiles.

Main Results:

TE abundance and diversity vary widely among eukaryotes, irrespective of organismal complexity.
Selection against new TE insertions, particularly via ectopic recombination, limits their fixation.
Reduced effective population size due to bottlenecks or inbreeding diminishes selection efficacy, increasing the impact of genetic drift.

Conclusions:

The genomic landscape of transposable elements is a product of complex evolutionary forces.
Genetic drift plays a significant role in shaping TE profiles, especially in populations with reduced effective sizes.
Understanding TE dynamics is crucial for comprehending genome evolution and architecture.