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Overview of Transposition and Recombination02:13

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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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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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Transposons

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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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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...
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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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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Transposon-based tagging: IRAP, REMAP, and iPBS.

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  • 1MTT/BI Plant Genomics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland.

Methods in Molecular Biology (Clifton, N.J.)
|January 14, 2014
PubMed
Summary

Retrotransposons are valuable molecular markers in eukaryotic genomes. New protocols for Inter-Retrotransposon Amplified Polymorphisms (IRAP), Retrotransposon-Microsatellite Amplification Polymorphism (REMAP), and inter-Simple Sequence Repeat (iPBS) techniques facilitate their use.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Retrotransposons are abundant in eukaryotic genomes, serving as effective molecular markers due to their stable integration and polymorphism.
  • Existing marker systems like IRAP, REMAP, RBIP, and SSAP leverage retrotransposon insertions for genetic analysis.
  • These methods are cost-effective and do not require extensive genome sequence data.

Purpose of the Study:

  • To describe detailed protocols for IRAP, REMAP, and iPBS techniques.
  • To provide methods for PCR amplification using single or dual primers.
  • To outline agarose gel electrophoresis procedures and iPBS techniques for isolating retrotransposon elements.

Main Methods:

  • Utilizing PCR amplification targeting retrotransposon termini and flanking genomic DNA.
  • Implementing IRAP, REMAP, and iPBS marker systems.
  • Employing agarose gel electrophoresis with optimized buffers for product analysis.

Main Results:

  • Established protocols for IRAP, REMAP, and iPBS marker development.
  • Demonstrated PCR amplification strategies suitable for various marker systems.
  • Provided methods for efficient isolation of retrotransposon termini and full-length elements.

Conclusions:

  • The described protocols offer accessible and cost-effective methods for retrotransposon-based molecular marker development.
  • These techniques are valuable for genetic diversity studies and marker-assisted selection in various species.
  • The iPBS method facilitates rapid isolation of retrotransposon DNA for further characterization.