Genetic analysis of tomato brown rugose fruit virus reveals evolutionary adaptation and codon usage bias patterns

• Published in: Scientific reports Vol. 14; no. 1; pp. 21281 - 17
• Main Author: Ghorbani, Abozar
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 11.09.2024; Nature Publishing Group; Nature Portfolio
• Subjects: 631/181; 631/61; Adaptation; Adaptation, Physiological - genetics; Antiviral drugs; Bias; Coat protein; Codon - genetics; Codon Usage; Codon usage bias; Codons; Comparative analysis; DNA-directed RNA polymerase; Ecological adaptation; Environmental factors; Evolution, Molecular; Evolutionary dynamics; Evolutionary genetics; Fruits; Genes; Genetic analysis; Genetic diversity; Genetic Variation; Genome, Viral; Genomes; Genomic analysis; Humanities and Social Sciences; Molecular adaptation; Molecular modelling; Movement protein; multidisciplinary; Mutation rates; Plant Diseases - genetics; Plant Diseases - virology; Plant protection; Plant viruses; Positive selection; RNA polymerase; RNA-directed RNA polymerase; Science; Science (multidisciplinary); Selection pressures; Selection, Genetic; Single-nucleotide polymorphism; Solanum lycopersicum - genetics; Solanum lycopersicum - virology; Tomato brown rugose fruit virus; Tomatoes; Transversion; Tomato brown rugose fruit virus; Molecular adaptation; Codon usage bias; Selection pressures; Evolutionary dynamics
• DOI: 10.1038/s41598-024-72298-y
• ISSN: 2045-2322

Tomato brown rugose fruit virus (ToBRFV) poses a significant threat to tomato production worldwide, prompting extensive research into its genetic diversity, evolutionary dynamics, and adaptive strategies. In this study, we conducted a comprehensive analysis of ToBRFV at the codon level, focusing on codon usage bias, selection pressures, and evolutionary patterns across multiple genes. Our analysis revealed distinct patterns of codon usage bias and selection pressures within the ToBRFV genome, with varying levels of genetic diversity and evolutionary constraints among different genes. We observed a transition/transversion bias of 2.07 across the entire ToBRFV genome, with the movement protein (MP) gene exhibiting the highest transition/transversion bias and SNP density, suggesting potential evolutionary pressures or a higher mutation rate in this gene. Furthermore, our study identified episodic positive selection primarily in the MP gene, highlighting specific codons subject to adaptive changes in response to host immune pressures or environmental factors. Comparative analysis of codon usage bias in the coat protein (CP) and RNA-dependent RNA polymerase (RdRp) genes revealed gene-specific patterns reflecting functional constraints and adaptation to the host's translational machinery. Our findings provide valuable insights into the molecular mechanisms driving ToBRFV evolution and adaptation, with implications for understanding viral pathogenesis, host-virus interactions, and the development of control strategies. Future research directions include further elucidating the functional significance of codon usage biases, exploring the role of episodic positive selection in viral adaptation, and leveraging these insights to inform the development of effective antiviral strategies and crop protection measures.