Evaluation of the molecular diversity of Brazilian strains of the B.1.1 variant of SARS-CoV-2 used in vaccines

Abstract

In this work, 28 sequences with 57,570 sites of the B.1.1 variant of SARS-CoV-2, from Brazilian states, were used. All sequences (publicly available on the National Center for Biotechnology Information platform (NCBI)) were aligned with Mega X software and all gaps, ambiguous sites and lost data were extracted, resulting in a region in a segment with 8,799 polymorphic (15.2% of the total) that were analyzed for their molecular diversity, FST, demographic and spatial expansion. Phylogenetic relationships of ancestry revealed the absence of genetically distinct subgroups, which was corroborated by the low value of FST found (15.38%). The low degree of polymorphism found among these samples, corroborated by the almost non-existent genetic distance, helped or established the absence of a genetic structuring pattern, demonstrating a satisfactory pattern of response to vaccines, since all the sequences analyzed were part of the Brazilian strains of variant B.1.1 of SARS-CoV-2 used in vaccines.