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siRNA - Small Interfering RNAs02:30

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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Insect small non-coding RNA involved in epigenetic regulations.

Séverine Chambeyron1, Hervé Seitz1

  • 1Institut de Génétique Humaine, Centre National de la Recherche Scientifique (CNRS), UPR 1142, 141, rue de la Cardonille, 34396 Montpellier Cedex 5, France.

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Small RNAs regulate genes epigenetically in insects, guiding gene silencing and heterochromatin formation. Some small RNAs also enable stable, transgenerational inheritance of traits.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Small regulatory RNAs (sRNAs) are key regulators of gene expression.
  • Beyond post-transcriptional gene silencing, sRNAs can direct epigenetic modifications.
  • Epigenetic regulation by sRNAs in insects is an emerging area of research.

Purpose of the Study:

  • To review the current literature on small RNA-guided epigenetic regulation in insects.
  • To summarize the molecular mechanisms, factors, and localization involved.
  • To discuss the role of maternally inherited sRNAs in transgenerational epigenetic inheritance.

Main Methods:

  • Literature review of published studies on sRNA-mediated epigenetics in insects.
  • Analysis of findings from deep sequencing and RNA interference (RNAi) screens.
  • Examination of evolutionary conservation of sRNA effector proteins.

Main Results:

  • sRNAs guide both gene silencing and heterochromatin formation at specific genomic loci.
  • Novel analytical technologies have identified key factors, mechanisms, and localization of sRNA effectors.
  • Maternally inherited sRNAs can mediate stable, transgenerational phenotypic effects.
  • Evolutionary analysis reveals variable conservation of these regulatory pathways across insect species.

Conclusions:

  • Small RNA-guided epigenetic regulation is a significant mechanism in insects.
  • These pathways involve diverse molecular players and exhibit distinct modes of inheritance.
  • Understanding these processes is crucial for comprehending insect development and evolution.