Those planning a family should be even more cautious against infection Image Credit: Drew Hayes/ Unsplash
Human embryos could be susceptible to COVID-19 as early as the second week of pregnancy, if the mother gets sick, potentially affecting the chances of a successful pregnancy, according to a study.
Scientists at the UK's University of Cambridge and California Institute of Technology in the US found that genes thought to play a role in how the SARS-CoV-2 virus infects our cells have been found to be active in embryos as early as during the second week of pregnancy.
While initially recognised as causing respiratory disease, the SARS-CoV-2 virus, which causes COVID-19 disease, also affects many other organs, they said.
Advanced age and obesity are risk factors for complications but questions concerning the potential effects on foetal health and successful pregnancy for those infected with SARS-CoV-2 remain largely unanswered, according to the researchers.
In the journal Open Biology, the researchers described how they used technology to culture human embryos through the stage they normally implant in the body of the mother to look at the activity - or 'expression' - of key genes in the embryo. On the surface of the SARS-CoV-2 virus are large 'spike' proteins. Spike proteins bind to ACE2, a protein receptor found on the surface of cells in our body, the researchers explained. Both the spike protein and ACE2 are then cleaved, allowing genetic material from the virus to enter the host cell.
The virus manipulates the host cell's machinery to allow the virus to replicate and spread, they said.
The researchers found patterns of expression of the genes ACE2, which provide the genetic code for the SARS-CoV-2 receptor, and TMPRSS2, which provides the code for a molecule that cleaves both the viral spike protein and the ACE2 receptor, allowing infection to occur.
These genes were expressed during key stages of the embryo's development, and in parts of the embryo that go on to develop into tissues that interact with the maternal blood supply for nutrient exchange.
Gene expression requires that the DNA code is first copied into an RNA message, which then directs the synthesis of the encoded protein.
"Our work suggests that the human embryo could be susceptible to COVID-19 as early as the second week of pregnancy if the mother gets sick," said Professor Magdalena Zernicka-Goetz, who holds positions at both the University of Cambridge and Caltech.
"To know whether this really could happen, it now becomes very important to know whether the ACE2 and TMPRSS2 proteins are made and become correctly positioned at cell surfaces.
If these next steps are also taking place, it is possible that the virus could be transmitted from the mother and infect the embryo's cells," Zernicka-Goetz said.
Professor David Glover, also from Cambridge and Caltech, noted that genes encoding proteins that make cells susceptible to infection by the novel coronavirus become expressed very early on in the embryo's development.
"This is an important stage when the embryo attaches to the mother's womb and undertakes a major remodelling of all of its tissues and for the first time starts to grow, Glover said.
He added that COVID-19 could affect the ability of the embryo to properly implant into the womb or could have implications for future foetal health.
The team said that further research is required using stem cell models and in non-human primates to better understand the risk.
However, they said their findings emphasise the importance for women planning for a family to try to reduce their risk of infection.
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Embryos could be susceptible to COVID-19 from second week of pregnancy - Gulf News
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