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Related Concept Videos

Overview of Transposition and Recombination02:13

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...
LTR Retrotransposons03:08

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...
DNA-only Transposons02:57

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...
Non-LTR Retrotransposons03:18

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...
Transposons01:24

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

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Real-Time Quantification of the Effects of IS200/IS605 Family-Associated TnpB on Transposon Activity
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TEclass--a tool for automated classification of unknown eukaryotic transposable elements.

György Abrusán1, Norbert Grundmann, Luc DeMester

  • 1Katholieke Universiteit Leuven, Department of Biology, Laboratory of Aquatic Ecology and Evolutionary Biology, Ch. Deberiotstraat 32, 3000 Leuven, Belgium. abrusan@uni-muenster.de

Bioinformatics (Oxford, England)
|April 8, 2009
PubMed
Summary
This summary is machine-generated.

TEclass software classifies transposable elements (TEs) into four functional categories using machine learning. This tool aids in understanding genomic repetitive elements by providing taxonomic information for consensus sequences.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Genomics

Background:

  • High-throughput sequencing necessitates robust tools for analyzing repetitive genomic elements.
  • Existing software often identifies repeats but lacks taxonomic classification.
  • Transposable elements (TEs) are crucial for genome evolution and function.

Purpose of the Study:

  • To develop and present TEclass, a novel software tool for classifying transposable elements.
  • To categorize TEs into four main functional groups based on their transposition mechanisms.
  • To provide taxonomic information for reconstructed consensus sequences of repetitive elements.

Main Methods:

  • TEclass employs a machine learning approach, specifically a support vector machine (SVM).
  • Classification is based on the analysis of oligomer frequencies within DNA sequences.
  • The tool processes raw repeat data to reconstruct consensus sequences.

Main Results:

  • TEclass achieves high accuracy in classifying novel DNA transposons (90-97%) and LTR retrotransposons (90-97%).
  • The software demonstrates 75% accuracy for classifying LINEs and SINEs.
  • Provides functional categorization for previously unclassified transposable elements.

Conclusions:

  • TEclass offers an effective solution for classifying transposable elements based on their sequence characteristics.
  • The tool enhances the analysis of repetitive elements in large-scale genomic datasets.
  • TEclass aids in understanding the evolutionary roles and distribution of different TE families.