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An Hsp70 Chaperone Is Involved in Meiotic Silencing by Unpaired DNA

Victor T Sy1, Sterling S Trawick1, Hagen M Tatarsky1

  • 1Division of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.

Epigenomes
|February 20, 2026
PubMed

Insights

Meiotic silencing by unpaired DNA (MSUD) in Neurospora uses the SMS-2 Argonaute to silence unpaired genes. A heat shock protein 70 (Hsp70) interacts with SMS-2, mediating this crucial gene silencing process during meiosis.

Area of Science:

  • Molecular Biology
  • Genetics
  • Mycology

Background:

  • Meiotic silencing by unpaired DNA (MSUD) is a process in the fungus Neurospora crassa that silences genes lacking a meiotic partner.
  • This silencing relies on RNA interference (RNAi) machinery, including the SMS-2 Argonaute protein, which uses small interfering RNAs (siRNAs) to target unpaired gene messenger RNAs (mRNAs).
  • In Drosophila melanogaster, the heat shock protein 70 (Hsp70) chaperone system is known to assist in Argonaute activation and siRNA loading.

Purpose of the Study:

  • To investigate the role of heat shock protein 70 (Hsp70) in the meiotic silencing by unpaired DNA (MSUD) pathway in Neurospora crassa.
  • To determine if Hsp70 interacts with the SMS-2 Argonaute protein and influences its function in silencing unpaired genes.

Main Methods:

  • Biochemical assays to detect interactions between Hsp70 and SMS-2.
  • Functional studies to assess the impact of Hsp70 on MSUD-mediated gene silencing.
  • Analysis of siRNA loading and Argonaute activity in the presence and absence of Hsp70.

Main Results:

  • Demonstrated a direct interaction between an Hsp70 protein and the SMS-2 Argonaute in Neurospora.
  • Showed that Hsp70 mediates the silencing of unpaired genes through the MSUD pathway.
  • Confirmed the involvement of Hsp70 in the functional regulation of SMS-2 during meiosis.

Conclusions:

  • Hsp70 plays a critical role in the meiotic silencing of unpaired DNA (MSUD) in Neurospora crassa.
  • The Hsp70 chaperone system directly interacts with SMS-2 Argonaute, facilitating the silencing of genes lacking meiotic partners.
  • This finding highlights a conserved mechanism involving Hsp70 in Argonaute-mediated gene silencing across different species.
Keywords:
Neurospora crassaRNA interference (RNAi)genome defenseheat shock proteins (HSPs)meiotic silencing by unpaired DNA (MSUD)

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