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The Sequence Types and Features Ontology (SO) is downloaded weekly from the SourceForge CVS repository at For more information about this ontology, see the Sequence Ontology Home Page at

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Accession:SO:0001819 term browser browse the term
Definition:A sequence variant where there is no resulting change to the encoded amino acid.
Comment:EBI term: Synonymous SNPs - In coding sequence, not resulting in an amino acid change (i.e. silent mutation).\nThis term is sometimes used synonomously with the more general term 'silent mutation', although a silent mutation may occur in non coding sequence. The best practice is to annotate to the most specific term.
Synonyms:exact_synonym: Jannovar:synonymous_variant;   Seattleseq:synonymous;   VAAST:synonymous_codon;   VAAST:synonymous_variant;   VAT:synonymous;   VEP:synonymous_variant;   coding-synon;   snpEff:SYNONYMOUS_CODING;   synonymous codon;   synonymous_coding;   synonymous_codon
 related_synonym: ANNOVAR:synonymous SNV;   Seattleseq:synonymous-near-splice;   silent mutation;   silent substitution;   silent_mutation
 alt_id: SO:0001588
 xref:; "wiki";; "Seattleseq";; "VAT";

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  SO ontology 0
    sequence_variant 0
      structural_variant 0
        feature_variant 0
          gene_variant 0
            transcript_variant 0
              coding_transcript_variant 0
                coding_sequence_variant 0
                  synonymous_variant 0
                    start_retained_variant 0
                    stop_retained_variant 0
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