SARS-CoV-2 pseudoparticles preferentially infect ectoderm in human embryonic tissues

Area of Science:

• Developmental biology
• Virology
• Stem cell research

Background:

• Studying early human embryonic development in pregnant women is difficult.
• Understanding viral infections during early development is crucial for public health.

Purpose of the Study:

• To investigate the susceptibility of human embryonic stem cells and germ layers to SARS-CoV-2 infection.
• To identify factors contributing to differential infection rates in embryonic cells.

Main Methods:

• Utilized a "disease-in-a-dish" model.
• Infected human embryonic stem cells and differentiated ectoderm, endoderm, and mesoderm cells with SARS-CoV-2.

Main Results:

• Ectodermal cells exhibited significantly higher SARS-CoV-2 infection rates than endoderm and mesoderm.
• Ectodermal susceptibility is linked to dual viral entry pathways, elevated TMPRSS2 activity, and a reduced glycocalyx.

Conclusions:

• Early post-implantation human embryonic cells are susceptible to SARS-CoV-2.
• High ectodermal infection rates suggest potential teratogenic risks, especially for the nervous system.
• Further clinical research is needed on neurological outcomes in infants exposed to SARS-CoV-2 in utero.