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Covidex: An ultrafast and accurate tool for SARS-CoV-2 subtyping
Marco Cacciabue1, Pablo Aguilera1, María Inés Gismondi1
1Instituto de Agrobiotecnología y Biología Molecular (IABIMO), Instituto Nacional de Tecnología Agropecuaria (INTA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), De los Reseros y N. Repetto s/n, Hurlingham B1686IGC, Buenos Aires, Argentina; Universidad Nacional de Luján, Departamento de Ciencias Básicas, Av. Constitución y RN 5, 6700 Luján, Buenos Aires, Argentina.
A new tool called Covidex rapidly and accurately subtypes SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) genomes using machine learning. This aids in tracking viral variants of interest and concern for global health surveillance.
Area of Science:
- Virology
- Genomics
- Bioinformatics
Background:
- Epidemiological surveillance of SARS-CoV-2 relies on whole-genome sequencing to identify emerging viral lineages.
- Certain SARS-CoV-2 subtypes exhibit enhanced transmissibility or immune evasion, designated as Variants of Interest (VOI) or Variants of Concern (VOC).
- Accurate and rapid subtyping is essential for effective pathogen surveillance and public health response.
Purpose of the Study:
- To introduce Covidex, an open-source, alignment-free machine learning tool for SARS-CoV-2 genome subtyping.
- To provide an ultra-fast and accurate classification of viral sequences into major nomenclature systems.
- To categorize sequences as VOI or VOC based on current definitions.
Main Methods:
- Development of Covidex as a Shiny web application.
- Implementation of an alignment-free machine learning approach for sequence classification.
- Integration of GISAID, Nextstrain, and Pango lineage nomenclatures.
Main Results:
- Covidex achieves ultra-fast and accurate classification of SARS-CoV-2 genome sequences.
- The tool effectively categorizes sequences into GISAID, Nextstrain, and Pango lineage systems.
- Input sequences are reliably classified as VOI or VOC.
Conclusions:
- Covidex is a valuable, open-source tool for SARS-CoV-2 subtyping.
- Its speed and accuracy enhance epidemiological surveillance capabilities.
- The tool supports public health efforts in monitoring viral evolution and spread.
