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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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Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Exon Recombination02:32

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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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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Transcription Attenuation in Prokaryotes02:42

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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Related Experiment Video

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Transposon-triggered epigenetic chromatin dynamics modulate EFR-related pathogen response.

Regina Mencia1, Agustín L Arce1, Candela Houriet1

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A transposon fine-tunes plant immunity by regulating chromatin. This mechanism controls the plant immune response to pathogens, impacting crop resistance and evolution.

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Area of Science:

  • Plant biology
  • Genetics
  • Molecular biology

Background:

  • Plants utilize pattern recognition receptors (PRRs) to detect pathogen threats, similar to animals.
  • Balancing plant immune responses is critical for crop yield and pathogen resistance, as overactive immunity can be detrimental.
  • Understanding the regulation of plant defense mechanisms is key to developing resilient crops.

Purpose of the Study:

  • To investigate the role of an inverted-repeat transposon (Ea-IR) in regulating plant immune responses.
  • To elucidate the interaction between transposons, chromatin organization, and gene expression in Arabidopsis.
  • To understand how these interactions fine-tune immune responses during pathogen infection and evolution.

Main Methods:

  • Analysis of chromatin organization around PRR loci (EFR and XI-k) in Arabidopsis.
  • Monitoring gene transcription and chromatin changes upon pathogen infection.
  • Investigating the processing of long transcripts and small RNA generation.
  • Comparing immune responses and EFR levels in Arabidopsis accessions with and without Ea-IR.

Main Results:

  • The Ea-IR transposon influences chromatin structure, forming a repressive loop between EFR and XI-k.
  • Pathogen infection triggers chromatin opening, increasing EFR transcription.
  • A long transcript containing Ea-IR is processed into small RNAs that restore repressive chromatin, dampening the immune response.
  • Arabidopsis lacking Ea-IR exhibit higher basal EFR levels and enhanced pathogen resistance.

Conclusions:

  • Transposons, chromatin organization, and gene expression dynamically interact to fine-tune plant immune responses.
  • This regulatory mechanism impacts both the immediate response to infection and long-term evolutionary adaptation.
  • The Ea-IR system provides a model for understanding how mobile genetic elements shape plant defense strategies.