Unique SARS-CoV-2 Variant Exhibiting Plenteous Missense Mutations in Structural and Nonstructural Genes

Area of Science:

• Virology
• Genetics
• Molecular Biology

Background:

• Understanding genetic variations in SARS-CoV-2 is crucial for comprehending pathogenicity, diagnosis, prevention, and treatment strategies.
• The emergence of new SARS-CoV-2 variants necessitates continuous genetic surveillance to track evolutionary changes.

Purpose of the Study:

• To determine the genetic variations of a specific SARS-CoV-2 variant.
• To compare the genetic makeup of this variant against the original Wuhan strain (NC_045512).

Main Methods:

• SARS-CoV-2 genome sequences were retrieved from the National Center for Biotechnology Information (NCBI).
• Sequences were aligned against the reference Wuhan strain (NC_045512) to identify nucleotide and protein variations.
• Phylogenetic analysis was performed to assess the evolutionary relationship of the variant.

Main Results:

• The studied SARS-CoV-2 variant (MT577016) exhibited low homology (98.75%) with the Wuhan strain.
• A total of 301 nucleotide changes were identified, resulting in 258 distinct mutations, predominantly missense (80%).
• Significant mutations were found in structural genes, including the spike (S) gene (16.7%) and envelope (E) gene.

Conclusions:

• The analyzed SARS-CoV-2 variant displays considerable genetic divergence from the Wuhan strain, characterized by low homology and a distant phylogenetic relationship.
• The high frequency of mutations, particularly in the S and E genes, suggests potential implications for viral behavior and therapeutic targets.