Each person’s gene for making a molecule called miR1307 may explain disease severity not just for Covid, but for several viruses

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The study results, recently published in the journal mSphere, describe a molecule made from DNA -- miR1307 -- as a potential dimmer switch that may influence the severity of the disease; why some infected with SARS-CoV-2, the virus that causes COVID-19, have mild or even no symptoms, while others become seriously ill or die.
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In past studies, miR1307 has been found to affect the severity of several types of cancer, lung disease and the flu, specifically the H1N1 influenza virus that caused a 2009 pandemic. It was first discovered as a key regulatory agent in the Epstein-Barr virus, best known as the cause of infectious mononucleosis.

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