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SARS-COV CH.1.1 VARIANT: GENOMIC AND STRUCTURAL INSIGHT
Autor
Afiliación
Sciences and Technologies for Sustainable Development and One Health. University Campus Bio-Medico of Rome. Rome, Italy
Unit of Medical Statistics and Molecular Epidemiology. University Campus Bio-Medico of Rome. Rome, Italy/Unit of Gastroenterology. Department of Medicine. University Campus Bio-Medico of Rome. Rome, Italy
Department of Biomedical Sciences. University of Sassari. Sassari, Italy
Department of Biomedical Sciences. University of Sassari. Sassari, Italy
Department of Veterinary Medicine. University of Sassari. Sassari, Italy
National HIV/AIDS Research Center. National Institute of Health. Rome, Italy
Department of Biochemical Sciences “A. Rossi Fanelli”. Sapienza University of Rome, Rome, Italy
Infection Prevention and Control—Infectious Disease Service. Fondazione Policlinico Universitario Campus Bio-Medico. Rome, Italy
Burnett School of Biomedical Sciences. University of Central Florida. Orlando, FL, USA
Sciences and Technologies for Sustainable Development and One Health. University Campus Bio-Medico of Rome. Rome, Italy/Fundação Oswaldo Cruz. Instituto Rene Rachou. Belo Horizonte, MG, Brazil
Unit of Medical Statistics and Molecular Epidemiology. University Campus Bio-Medico of Rome. Rome, Italy
Unit of Medical Statistics and Molecular Epidemiology. University Campus Bio-Medico of Rome. Rome, Italy/Unit of Gastroenterology. Department of Medicine. University Campus Bio-Medico of Rome. Rome, Italy
Department of Biomedical Sciences. University of Sassari. Sassari, Italy
Department of Biomedical Sciences. University of Sassari. Sassari, Italy
Department of Veterinary Medicine. University of Sassari. Sassari, Italy
National HIV/AIDS Research Center. National Institute of Health. Rome, Italy
Department of Biochemical Sciences “A. Rossi Fanelli”. Sapienza University of Rome, Rome, Italy
Infection Prevention and Control—Infectious Disease Service. Fondazione Policlinico Universitario Campus Bio-Medico. Rome, Italy
Burnett School of Biomedical Sciences. University of Central Florida. Orlando, FL, USA
Sciences and Technologies for Sustainable Development and One Health. University Campus Bio-Medico of Rome. Rome, Italy/Fundação Oswaldo Cruz. Instituto Rene Rachou. Belo Horizonte, MG, Brazil
Unit of Medical Statistics and Molecular Epidemiology. University Campus Bio-Medico of Rome. Rome, Italy
Resumen en ingles
In early February 2023, the Omicron subvariant XBB.1.5, also known as “Kraken”, accounted for more than 44% of new COVID-19 cases worldwide, whereas a relatively new Omicron subvariant named CH.1.1, deemed “Orthrus”, accounted for less than 6% of new COVID-19 cases during the subsequent weeks. This emerging variant carries a mutation, L452R, previously observed in the highly pathogenic Delta and the highly transmissible BA.4 and BA.5 variants, necessitating a shift to active surveillance to assure adequate preparedness for likely future epidemic peaks. We provide a preliminary understanding of the global distribution of this emerging SARS-CoV-2 variant by combining genomic data with structural molecular modeling. In addition, we shield light on the number of specific point mutations in this lineage that may have functional significance, thereby increasing the risk of disease severity, vaccine resistance, and increased transmission. This variant shared about 73% of the mutations with Omicron-like strains. Our homology modeling analysis revealed that CH.1.1 may have a weakened interaction with ACE2 and that its electrostatic potential surface appears to be more positive than that of the reference ancestral virus. Finally, our phylogenetic analysis revealed that this likely-emerging variant was already cryptically circulating in European countries prior to its first detection, highlighting the importance of having access to whole genome sequences for detecting and controlling emerging viral strains
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