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ABSTRACT: Genome sequencing of SARS-CoV-2 in wastewater confirm early arrival of omicron at Frankfurt airport but limited spread in Frankfurt city wastewater during November 2021

PROVIDER: PRJNA789814 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR17258652.fastq.gz	Fastqsanger.gz
	SRR17258653.fastq.gz	Fastqsanger.gz
	SRR17258654.fastq.gz	Fastqsanger.gz
	SRR17258655.fastq.gz	Fastqsanger.gz

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Immunological and Metabolic Characteristics of the Omicron Variants Infection

Project description:The Omicron variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), first identified in November 2021 in South Africa, has initiated the 5th wave of global pandemics. Here, we systemically examined immunological and metabolic characteristics of Omicron variants infection. We found Omicron resisted to neutralizing antibody targeting receptor binding domain (RBD) of wild-type SARS-CoV-2. Omicron could not be neutralized by sera of Corona Virus Disease 2019 (COVID-19) convalescent individuals who were infected with the Delta variant. Through mass spectrometry on MHC-bound peptidomes, we found that the spike protein of the Omicron variants could generate additional CD8+ T cell epitopes, compared with Delta. These epitopes could induce robust CD8+ T cell responses. Moreover, we found booster vaccination increased the cross-memory CD8+ T cell responses against Omicron. Metabolic regulome analysis of Omicron-specific T cell showed a metabolic profile that promoted memory T cell responses. Consistently, a higher fraction of memory CD8+ T cells were found in Omicron stimulated peripheral blood mononuclear cells (PBMCs). In addition, CD147 was also a receptor for the Omicron variants, and CD147 antibody inhibited infection of Omicron. CD147-mediated Omicron infection in a human CD147 transgenic mouse model induced exudative alveolar pneumonia. Taken together, our data suggested that vaccination booster and receptor blocking antibody are two effective strategies against Omicron.

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Project description:Investigation of an airport-associated cluster of falciparum malaria in Frankfurt, Germany

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The Receptor Binding Domain of SARS-CoV-2 Omicron Subvariants Targets Siglec-9 to Decrease the Immunogenicity by Preventing Phagocytosis of Macrophages

Project description:SARS-CoV-2 Omicron infection results in a milder clinical feature compared to the Delta strain. The development of Omicron specific vaccine has also been hampered due to the low immunogenicity. By reverse-mutating the amino acids in the Omicron receptor binding domain (RBD), we identified that the mutation from Phenylalanine 375 (F375) in the Omicron spike to Serine 375 (S375) in Delta and other early strains significantly enhances the immune response in the manner of vaccines. Interestingly, the new evolution of the 371FAPF375FAF sequence in Omicron exhibited a potent inhibitory effect on macrophage uptake of the RBD nanoparticle or spike-pseudovirus particles. Omicron RBD enhances binding to Siglec-9 on macrophages to reduce the immunogenicity and increase the immune evasion, which could be abrogated by Serine 375 mutation. Based upon these observations, we further developed a bivalent Omicron RBD with S375 mutation and Delta RBD nanoparticle vaccine, which elicited potent and broad neutralizing antibodies in mice, rabbits, and rhesus macaques. Our research suggests that manipulating the Siglec-9 pathway could be a promising approach to enhancing vaccine response. Importantly, our findings suggest that Omicron subvariants have developed a new strategy to evade immune surveillance by impairing the phagocytosis and antigen presentation processes of macrophages.

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