To check new variant entries, press "Convert" or "Annotate" button. We recommend running HGVS format check
if the result is not as expected.
Mitochondrial DNA variant nomenclature has multiple existing systems used in literature and in different institutes. The major ways are:
1. HGVS Committee: m.8993T>G. This is its recommended format and is widely used in literature.
2. HGVS NCBI/ClinVar: NC_012920.1:m.8993T>G, reference version is required.
3. HGVS Ensembl: MT:g.8993T>G
4. HGVS Mutalyzer: NC_012920.1:g.8993T>G
5. Classical I: used in literature, PhyloTree, Haplogrep, 8527, 8993G, 8993d, 5787_5789d, 1494.1T, 7472.XA
6. Classical II: T8993G
7. Potential non-standard: 8527A>G
8. VCF-style input: Tab-delimted, with at least the first 5 columns in vcf format
Adding to the complexity, the chromosome names can be used as any of the following:
chrM, chM, chrMT, chMT, M, MT, NC_012920.1.
The current mtDNA variant data is mostly based on the default revised Cambridge sequence (rCRS, accession number NC_012920.1), but some commercial SNP array platforms used YRI (accession number AF347015) reference.
The MSeqDR universal variant converter can convert the various combinations of these formats into a standard variant list in the rCRS-based HGVS (1-4) formats. It can convert YRI-based positions into rCRS-based positions.
*Note: Unlimited converter input size. The annotation is currently limited to first 100 entries, due to burden of calling external Ensembl web services. The limit will be lifted in future.