Wednesday, June 3, 2020

Evolution of pandemic coronavirus outlines path from animals to humans.

Evolution of pandemic coronavirus outlines path from animals to humans.The virus's ability to change makes it likely that new human coronaviruses will arise. A team of scientists studying the origin of SARS-CoV-2, the virus that has caused the COVID-19 pandemic, found that it was especially well-suited to jump from animals to humans by shapeshifting as it gained the ability to infect human cells. Conducting a genetic analysis, researchers from Duke University, Los Alamos National Laboratory, the University of Texas at El Paso and New York University confirmed that the closest relative of the virus was a coronavirus that infects bats. But that virus's ability to infect humans was gained through exchanging a critical gene fragment from a coronavirus that infects a scaly mammal called a pangolin, which made it possible for the virus to infect humans. The researchers report that this jump from species-to-species was the result of the virus's ability to bind to host cells through alterations in its genetic material. By analogy, it is as if the virus retooled the key that enables it to unlock a host cell's door -- in this case a human cell. In the case of SARS-CoV-2, the "key" is a spike protein found on the surface of the virus. Coronaviruses use this protein to attach to cells and infect them.

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