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The ERVK3-1 Microprotein Interacts with the HUSH Complex.

Ayodya Jayatissa1,2, Nadiya Jaunbocus1,2, Betel Erkalo1,2

  • 1Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.

Biochemistry
|July 23, 2025
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Summary

The newly identified ERVK3-1 microprotein interacts with the HUSH complex, a key regulator of gene expression. This interaction is crucial for repressing parasitic genomic elements, including endogenous retroviruses, in human cells.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Human endogenous retroviruses (hERVs) constitute 8% of the human genome.
  • The human ERVK3-1 locus was recently identified as encoding a microprotein.

Purpose of the Study:

  • To investigate the function of the ERVK3-1 microprotein in human cells.
  • To determine the role of the ERVK3-1 microprotein in gene regulation.

Main Methods:

  • Co-immunoprecipitation to assess protein interactions.
  • Gene expression analysis to evaluate transcriptional repression.
  • Analysis of HUSH complex target genes.

Main Results:

  • The ERVK3-1 microprotein interacts with PPHLN1, a component of the HUSH complex.
  • The ERVK3-1 microprotein is essential for the HUSH complex-mediated transcriptional repression of target genes.
  • The ERVK3-1 microprotein plays a role in regulating parasitic genomic elements.

Conclusions:

  • The ERVK3-1 Rec microprotein is a functional component of the HUSH complex.
  • This microprotein contributes to the sensing or regulation of target gene expression by the HUSH complex.
  • ERVK3-1 microprotein is involved in maintaining genome stability by repressing endogenous retroviruses.