Cytomegalovirus-encoded immediate early 1 protein perturbs neural progenitor proliferation via interfering with host...

Area of Science:

• Neuroscience
• Virology
• Developmental Biology

Background:

• Congenital cytomegalovirus (CMV) infection is a leading cause of non-genetic neurodevelopmental disabilities in infants.
• Mechanisms linking CMV infection to brain pathology, including intellectual disability and microcephaly, are poorly understood.
• Neural progenitor cell dysfunction is implicated in congenital CMV-induced brain abnormalities.

Purpose of the Study:

• To elucidate the molecular mechanisms by which congenital CMV infection causes neural progenitor cell deficits.
• To investigate the role of viral IE1 protein and host factors DISC1 and PML in CMV-induced brain pathology.
• To evaluate the therapeutic potential of targeting viral IE1 using CRISPR/Cas9 technology.

Main Methods:

• Analysis of host (DISC1, PML) and viral (IE1) protein interactions in neural progenitor cells.
• Utilizing CRISPR/Cas9 gene editing to target and abolish the viral IE1 protein in fetal brain models.
• In vitro and in vivo studies to assess the impact on neural progenitor proliferation and Notch pathway signaling.

Main Results:

• Congenital CMV infection attenuates neural progenitor proliferation by disrupting the PML-DISC1 interaction.
• The viral IE1 protein interferes with PML-DISC1 complex formation, leading to Notch pathway dysregulation.
• CRISPR/Cas9-mediated abolition of IE1 protein rescued progenitor cell deficits in embryonic brains, with minimal off-target effects.

Conclusions:

• The viral IE1 protein plays a pivotal role in congenital CMV-induced neural progenitor proliferation deficits.
• Interference with the host PML-DISC1 interaction by IE1 is a key mechanism driving brain pathology.
• IE1-targeting CRISPR/Cas9 presents a potential therapeutic strategy for congenital CMV infection.