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Human Kinase/Phosphatase-Wide RNAi Screening Identified Checkpoint Kinase 2 as a Cellular Factor Facilitating

Yi-Lin Chan1,2, Ching-Len Liao3,4, Yi-Ling Lin2,3,5

  • 1Department of Life Science, Chinese Culture University, Taipei, Taiwan.

Frontiers in Cellular and Infection Microbiology
|June 6, 2018
PubMed

Insights

Japanese encephalitis virus (JEV) activates checkpoint kinase 2 (CHK2), a cell cycle regulator. Inhibiting CHK2 reduces JEV replication, offering a new strategy against this dangerous flavivirus.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Japanese encephalitis virus (JEV) is a mosquito-borne flavivirus causing severe human encephalitis and high mortality.
  • Understanding the interplay between viral and host cellular factors is crucial for controlling JEV infection.

Purpose of the Study:

  • To identify cellular factors regulating Japanese encephalitis virus replication.
  • To investigate the role of cell cycle regulators in JEV infection.

Main Methods:

  • Utilized a kinase/phosphatase-wide RNA interference (RNAi) screening approach.
  • Employed chemical inhibitors to inactivate CHK2 and ATM kinases.
  • Used shRNA-producing lentiviral transduction to knockdown CHK2 expression.

Main Results:

  • Identified checkpoint kinase 2 (CHK2), a cell cycle regulator, as a key factor in JEV replication.
  • Observed that JEV infection induces G1 cell cycle arrest and activates CHK2.
  • Demonstrated that inactivation or knockdown of CHK2 significantly reduces JEV replication.

Conclusions:

  • Checkpoint kinase 2 (CHK2) is a critical cellular factor that participates in and promotes Japanese encephalitis virus replication.
  • Targeting CHK2 presents a potential novel therapeutic strategy for managing JEV infections.
Keywords:
Japanese encephalitis virus (JEV)ataxia-telangiectasia mutated kinase (ATM)cell cycle G1 arrestcheckpoint kinase 2 (CHK2)kinase/phosphatase-wide RNAi screening

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