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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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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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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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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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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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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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Arms race between anti-silencing and RdDM in noncoding regions of transposable elements.

Taku Sasaki1, Kae Kato2, Aoi Hosaka2

  • 1The University of Tokyo, Tokyo, Japan.

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Summary
This summary is machine-generated.

Transposable elements (TEs) fight silencing using anti-silencing proteins. Escaping RNA-directed DNA methylation (RdDM) drives TE evolution and diversification, potentially reducing host harm.

Keywords:
DNA methylationRdDManti-silencingtransposable elements

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Area of Science:

  • Genetics
  • Epigenetics
  • Molecular Biology

Background:

  • Transposable elements (TEs) are mobile DNA sequences.
  • Eukaryotes use epigenetic mechanisms like DNA methylation to silence TEs.
  • Arabidopsis VANDAL TEs utilize VANCs to counteract silencing.

Purpose of the Study:

  • Investigate the role of RNA-directed DNA methylation (RdDM) in VANDAL TE silencing.
  • Understand the evolutionary dynamics of anti-silencing systems.
  • Explore the relationship between TE proliferation and host integrity.

Main Methods:

  • Analysis of VANDAL TE sequences and their interaction with epigenetic marks.
  • Studying the de novo targeting of TE noncoding regions by RdDM.
  • Observing the evolution of VANC-mediated anti-silencing systems.

Main Results:

  • RdDM efficiently targets VANDAL TE noncoding regions for silencing.
  • Escape from RdDM is crucial for VANDAL TE evolution.
  • VANC proteins induce loss of silent chromatin marks in specific TE regions.

Conclusions:

  • RdDM-mediated silencing is a key factor in controlling VANDAL TEs.
  • TEs evolving anti-silencing mechanisms can diversify rapidly.
  • This TE behavior may paradoxically lead to reduced host damage through diversification.