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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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Enigmatic Pachytene PIWI-Interacting RNAs.

Ming-Min Xu1, Xin Zhiguo Li1

  • 1Center for RNA Medicine, the Fourth Affiliated Hospital of School of Medicine, and International School of Medicine, International Institutes of Medicine, Zhejiang University, Yiwu, China, 322000.

Genome Biology and Evolution
|July 26, 2024
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Summary

Pachytene PIWI-interacting RNAs (piRNAs) silence transposable elements, but most piRNAs lack direct targets. Non-TE piRNAs may enhance TE silencing or prime the genome against future transposable element invasions.

Keywords:
evolvabilitypiRNAtransposable element

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • PIWI-interacting RNAs (piRNAs) are key regulators of transposable elements (TEs).
  • Pachytene piRNAs, abundant during meiosis, have unclear functions despite targeting TEs.
  • Most pachytene piRNAs do not target active TEs, leaving their roles enigmatic.

Purpose of the Study:

  • To investigate the functional significance of non-TE piRNAs.
  • To explore the roles of non-TE piRNAs in conjunction with TE piRNAs.
  • To understand the potential of non-TE piRNAs in future TE suppression.

Main Methods:

  • Analysis of piRNA populations and their targets.
  • Bioinformatic analysis of piRNA precursors and biogenesis.
  • Comparative genomics across amniotes.

Main Results:

  • Pachytene piRNAs are essential for silencing active TEs in amniotes.
  • Only a small fraction (1%) of pachytene piRNAs directly target active TEs.
  • Abundant non-TE piRNAs are produced alongside TE piRNAs from common precursors.

Conclusions:

  • Non-TE piRNAs may indirectly support TE silencing mechanisms.
  • Non-TE piRNAs could establish a preemptive defense against novel TEs.
  • The study elucidates potential dual roles for non-TE piRNAs in genome defense.