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Ex Vivo Infection of Murine Epidermis with Herpes Simplex Virus Type 1
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TMEFF1 is a neuron-specific restriction factor for herpes simplex virus.

Yao Dai1, Manja Idorn2,3, Manutea C Serrero2,3

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Researchers discovered TMEFF1, a neuron-specific protein, acts as a crucial factor in restricting herpes simplex virus 1 (HSV-1) replication. This finding is vital for understanding brain protection against viral infections and inflammation.

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Area of Science:

  • Neurovirology
  • Immunology
  • Genetics

Background:

  • The brain is vulnerable to damage from infections and inflammation.
  • Herpes simplex virus 1 (HSV-1) can cause herpes simplex encephalitis.
  • The role of neuron-specific antiviral factors in brain protection is unclear.

Purpose of the Study:

  • To identify neuron-specific antiviral factors that restrict HSV-1 replication.
  • To understand the protective mechanisms of these factors in the central nervous system.

Main Methods:

  • Genome-wide CRISPR screening to identify restriction factors.
  • Using stem-cell-derived human neurons and Tmeff1 knockout mice.
  • Investigating viral entry mechanisms and replication dynamics.

Main Results:

  • TMEFF1 was identified as an HSV-1 restriction factor, specifically expressed in central nervous system neurons.
  • TMEFF1 depletion increased HSV-1 replication and neuronal death.
  • TMEFF1 inhibits HSV-1 entry by interacting with nectin-1 and myosin heavy chains.
  • Tmeff1 knockout mice showed increased brain susceptibility to HSV-1.

Conclusions:

  • TMEFF1 is a critical neuron-specific restriction factor against HSV-1 in the brain.
  • TMEFF1 plays a key role in preventing excessive viral replication and neuronal damage.