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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...
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...
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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...
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.
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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...
piRNA - Piwi-interacting RNAs02:57

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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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Genomic impact of eukaryotic transposable elements.

Irina R Arkhipova1, Mark A Batzer, Juergen Brosius

  • 1Institute of Experimental Pathology, ZMBE, University of Münster, Münster D-48149, Germany. RNA.world@uni-muenster.de.

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Summary

The third international conference on eukaryotic transposable elements (TEs) highlighted their genomic impact. Researchers emphasized the need for integrated computational and experimental approaches for studying TEs.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • The conference convened researchers globally to discuss eukaryotic transposable elements (TEs).
  • Focus was on the mechanisms and genomic impact of TEs.
  • The meeting aimed to foster interdisciplinary collaboration.

Purpose of the Study:

  • To gather scientists studying transposable elements (TEs) from diverse backgrounds.
  • To facilitate discussion on computational and experimental approaches to TE research.
  • To address unresolved issues in TE biology and genomic impact.

Main Methods:

  • Presentations on TE biology and genomic impact.
  • Contributed talks by young scientists.
  • Workshops focused on computational analysis of TEs.
  • Poster presentations and informal discussions.

Main Results:

  • The conference successfully brought together nearly 170 attendees.
  • Discussions covered various aspects of TE biology and computational analysis.
  • Repbase was recognized for its importance in comparative genomics.
  • The event underscored the necessity of collaboration between experimental and computational biologists.

Conclusions:

  • Close interaction between experimental and computational biologists is crucial for advancing TE research.
  • The success of the meeting highlights the growing importance of studying TEs.
  • Continued development and utilization of resources like Repbase are vital for comparative genomic studies.