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10.3390/ijms21217898

http://scihub22266oqcxt.onion/10.3390/ijms21217898
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33114322!7660598!33114322
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suck abstract from ncbi


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pmid33114322      Int+J+Mol+Sci 2020 ; 21 (21): ä
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  • Evolution of Transmissible Gastroenteritis Virus (TGEV): A Codon Usage Perspective #MMPMID33114322
  • Cheng S; Wu H; Chen Z
  • Int J Mol Sci 2020[Oct]; 21 (21): ä PMID33114322show ga
  • Transmissible gastroenteritis virus (TGEV) is a coronavirus associated with diarrhea and high mortality in piglets. To gain insight into the evolution and adaptation of TGEV, a comprehensive analysis of phylogeny and codon usage bias was performed. The phylogenetic analyses of maximum likelihood and Bayesian inference displayed two distinct genotypes: genotypes I and II, and genotype I was classified into subtypes Ia and Ib. The compositional properties revealed that the coding sequence contained a higher number of A/U nucleotides than G/C nucleotides, and that the synonymous codon third position was A/U-enriched. The principal component analysis based on the values of relative synonymous codon usage (RSCU) showed the genotype-specific codon usage patterns. The effective number of codons (ENC) indicated moderate codon usage bias in the TGEV genome. Dinucleotide analysis showed that CpA and UpG were over-represented and CpG was under-represented in the coding sequence of the TGEV genome. The analyses of Parity Rule 2 plot, ENC-plot, and neutrality plot displayed that natural selection was the dominant evolutionary driving force in shaping codon usage preference in genotypes Ia and II. In addition, natural selection played a major role, while mutation pressure had a minor role in driving the codon usage bias in genotype Ib. The codon adaptation index (CAI), relative codon deoptimization index (RCDI), and similarity index (SiD) analyses suggested that genotype I might be more adaptive to pigs than genotype II. Current findings contribute to understanding the evolution and adaptation of TGEV.
  • |*Codon Usage[MESH]
  • |*Evolution, Molecular[MESH]
  • |CpG Islands[MESH]
  • |Genome, Viral[MESH]
  • |Selection, Genetic[MESH]


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