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Related Concept Videos

Overview of Transposition and Recombination02:13

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 Transposons02:57

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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.
The donor site from where the transposon is excised is either degraded or...
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Non-LTR Retrotransposons03:18

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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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LTR Retrotransposons03:08

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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.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
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Types of Genetic Transfer Between Organisms02:18

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Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
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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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The sixth Japanese meeting on biological function and evolution through interactions between hosts and transposable

Kenji Ichiyanagi1, Yoko Ikeda2, Kuniaki Saito3

  • 1Laboratory of Genome and Epigenome Dynamics, Department of Animal Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan. ichiyana@agr.nagoya-u.ac.jp.

Mobile DNA
|December 13, 2023
PubMed
Summary

Researchers explored host-transposon interactions, focusing on transposable elements (TEs) and host defense systems. The meeting highlighted TE roles in genome evolution across diverse organisms.

Keywords:
EpigeneticsEvolutionGene innovationRetrotransposonTransposon

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Area of Science:

  • Genetics and Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • The sixth Japanese meeting on host-transposon interactions convened researchers to discuss the multifaceted roles of transposable elements (TEs).
  • Key areas included TE functions in genome dynamics, host defense mechanisms against TE proliferation, and evolutionary bursts of TEs.
  • The scope encompassed a wide range of organisms, from mammals and insects to plants, yeast, protozoa, and bacteria.

Purpose of the Study:

  • To synthesize current understanding and foster discussion on host-transposon interactions.
  • To explore the impact of TEs on genome function and evolution across diverse taxa.
  • To examine host defense strategies and evolutionary dynamics related to TE activity.

Main Methods:

  • The meeting served as a platform for presenting and discussing research findings.
  • Discussions covered theoretical and experimental approaches in host-TE interactions.
  • Comparative genomics and evolutionary analyses were implicitly discussed.

Main Results:

  • Highlights included the diverse roles of TEs in shaping genomes.
  • Insights into host defense mechanisms and the evolutionary significance of TE bursts were shared.
  • Intron mobility and its implications were also discussed.

Conclusions:

  • Host-transposon interactions are crucial drivers of genome evolution.
  • Understanding these interactions provides insights into genome stability and plasticity.
  • Continued research is vital for deciphering the complex interplay between hosts and TEs.