Mutation filters

It is possible to filter for amino acid and nucleotide bases/mutations. Multiple mutation filters can be provided in a single request.

A nucleotide mutation has the format <position><base>. A <base> can be one of the four nucleotides A, T, C, and G. It can also be - for deletion and N for unknown. Example: 123T

An amino acid mutation has the format <gene>:<position><base>. The following genes are available: E, M, N, ORF1a, ORF1b, ORF3a, ORF6, ORF7a, ORF7b, ORF8, ORF9b, S. A <base> can be one of the 20 amino acid codes. It can also be - for deletion and X for unknown. Example: E:57Q

The <base> can be omitted to filter for any mutation. You can write a . for the <base> to filter for sequences for which it is confirmed that no mutation occurred, i.e. has the same base as the reference genome at the specified position.

Note

Both, nucleotide and amino acid mutation filter, also support Maybe queries. Read more in ambiguous symbols. Example: MAYBE(E:57Q).