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10.3389/fmicb.2021.548275

http://scihub22266oqcxt.onion/10.3389/fmicb.2021.548275
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suck abstract from ncbi


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pmid33889134      Front+Microbiol 2021 ; 12 (ä): 548275
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  • Base Composition and Host Adaptation of the SARS-CoV-2: Insight From the Codon Usage Perspective #MMPMID33889134
  • Roy A; Guo F; Singh B; Gupta S; Paul K; Chen X; Sharma NR; Jaishee N; Irwin DM; Shen Y
  • Front Microbiol 2021[]; 12 (ä): 548275 PMID33889134show ga
  • The novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has been spreading rapidly all over the world and has raised grave concern globally. The present research aims to conduct a robust base compositional analysis of SARS-CoV-2 to reveal adaptive intricacies to the human host. Multivariate statistical analysis revealed a complex interplay of various factors including compositional constraint, natural selection, length of viral coding sequences, hydropathicity, and aromaticity of the viral gene products that are operational to codon usage patterns, with compositional bias being the most crucial determinant. UpG and CpA dinucleotides were found to be highly preferred whereas, CpG dinucleotide was mostly avoided in SARS-CoV-2, a pattern consistent with the human host. Strict avoidance of the CpG dinucleotide might be attributed to a strategy for evading a human immune response. A lower degree of adaptation of SARS-CoV-2 to the human host, compared to Middle East respiratory syndrome (MERS) coronavirus and SARS-CoV, might be indicative of its milder clinical severity and progression contrasted to SARS and MERS. Similar patterns of enhanced adaptation between viral isolates from intermediate and human hosts, contrasted with those isolated from the natural bat reservoir, signifies an indispensable role of the intermediate host in transmission dynamics and spillover events of the virus to human populations. The information regarding avoided codon pairs in SARS-CoV-2, as conferred by the present analysis, promises to be useful for the design of vaccines employing codon pair deoptimization based synthetic attenuated virus engineering.
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