SARS-CoV-2 Notable Mutations

Identification of mutations described in the Type Variants database


Genomes identified by Pathogenwatch as SARS-CoV-2 are searched against the Type Mutations database to identify mutations of significance to public health researchers. A full description of the database and software can be found here:


A modified version of the "type_variants" program is used to search against a curated database of variants. For each tested position, there are four possible outcomes: (1) wildtype; (2) mutation present; (3) another mutation; (4) sequence error - if the position is missing or contains one or more non-ATCG characters. If the mutation description contains a "*" that any mutation at that site is considered as "(2) mutation present".

Viewing the results

Genome Reports

Notable mutations are reported in individual genome reports with links to descriptions of the mutations in the Type Mutations website (e.g. for A222V view

Collection Viewer

Notable mutations are shown for SARS-CoV-2 collections in a metadata table that can be accessed using the table switcher. Found mutations are shown as a red circle, while other mutations at those positions are shown in yellow. Question marks indicate sequence errors, while a blank cell indicates that location has the wild type/reference sequence. Mutations can be selected by clicking on the header and corresponding tree leaves and map markers will update to red, yellow, or white.

Browsing genomes with a mutation

It's possible to select genomes with a specific mutation in the Genome Browser by selecting "Betacoronavirus" in the "Genus" filter, "Severe acute respiratory virus" in the "Species" filter, and then "subsp. SARS-CoV-2". This enables the "Notable Mutations" filter, allowing genomes with a specific mutation to be selected.

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