Regulation of host and virus genes by neuronal miR-138 favours herpes simplex virus 1 latency

Nat Microbiol. 2021 May;6(5):682-696. doi: 10.1038/s41564-020-00860-1. Epub 2021 Feb 8.

Abstract

MicroRNA miR-138, which is highly expressed in neurons, represses herpes simplex virus 1 (HSV-1) lytic cycle genes by targeting viral ICP0 messenger RNA, thereby promoting viral latency in mice. We found that overexpressed miR-138 also represses lytic processes independently of ICP0 in murine and human neuronal cells; therefore, we investigated whether miR-138 has targets besides ICP0. Using genome-wide RNA sequencing/photoactivatable ribonucleoside-enhanced crosslinking and immunoprecipitation followed by short interfering RNA knockdown of candidate targets, we identified the host Oct-1 and Foxc1 messenger mRNAs as miR-138's targets, whose gene products are transcription factors important for HSV-1 replication in neuronal cells. OCT-1 has a known role in the initiation of HSV transcription. Overexpression of FOXC1, which was not known to affect HSV-1, promoted HSV-1 replication in murine neurons and ganglia. CRISPR-Cas9 knockout of FOXC1 reduced viral replication, lytic gene expression and miR-138 repression in murine neuronal cells. FOXC1 also collaborated with ICP0 to decrease heterochromatin on viral genes and compensated for the defect of an ICP0-null virus. In summary, miR-138 targets ICP0, Oct-1 and Foxc1 to repress HSV-1 lytic cycle genes and promote epigenetic gene silencing, which together enable favourable conditions for latent infection.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Gene Expression Regulation, Viral
  • Herpes Simplex / genetics
  • Herpes Simplex / metabolism*
  • Herpes Simplex / virology*
  • Herpesvirus 1, Human / genetics*
  • Herpesvirus 1, Human / metabolism
  • Host-Pathogen Interactions
  • Humans
  • Immediate-Early Proteins / genetics
  • Immediate-Early Proteins / metabolism
  • Male
  • Mice
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Neurons / metabolism*
  • Neurons / virology
  • Organic Cation Transporter 1 / genetics
  • Organic Cation Transporter 1 / metabolism
  • RNA, Viral / genetics
  • RNA, Viral / metabolism
  • Ubiquitin-Protein Ligases / genetics
  • Ubiquitin-Protein Ligases / metabolism
  • Virus Latency*

Substances

  • Immediate-Early Proteins
  • MIRN138 microRNA, human
  • MicroRNAs
  • Organic Cation Transporter 1
  • RNA, Viral
  • Ubiquitin-Protein Ligases
  • Vmw110 protein, Human herpesvirus 1