Next Generation HGVS Nomenclature Checker

Bioinformatics. 2021 Feb 4;37(18):2811-2817. doi: 10.1093/bioinformatics/btab051. Online ahead of print.


Motivation: Unambiguous variant descriptions are of utmost importance in clinical genetic diagnostics, scientific literature, and genetic databases. The Human Genome Variation Society (HGVS) publishes a comprehensive set of guidelines on how variants should be correctly and unambiguously described. We present the implementation of the Mutalyzer 2 tool suite, designed to automatically apply the HGVS guidelines so users do not have to deal with the HGVS intricacies explicitly to check and correct their variant descriptions.

Results: Mutalyzer is profusely used by the community, having processed over 133 million descriptions since its launch. Over a five year period, Mutalyzer reported a correct input in approximately 50% of cases. In 41% of the cases either a syntactic or semantic error was identified and for approximately 7% of cases, Mutalyzer was able to automatically correct the description.

Availability: Mutalyzer is an Open Source project under the GNU Affero General Public License. The source code is available on GitHub ( and a running instance is available at: