Viewing single variant in MT-TF

Uncertain Significance (VUS)Not in ClinVar or MITOMAP — mtDNA classification needs case-level review

MT-TF:m.642T>C

Tutor Research

Nomenclaturem.642T>CchrMT:642|Not in ClinVar

Typemitochondrial tRNA variant

InheritanceMitochondrial

gnomAD mtDNA

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MitoTIP

15.1 · Q2 possibly pathogenic

Tutor Research

Some data sources returned errors (1) — other data may still be shown below

gnomad: gnomAD lookup failed: Error: gnomAD API error: 400

MITOMAPReported

Live entry

Disease: Ataxia, progressive external ophthalmoplegia (PEO), deafnessReported as: heteroplasmicGenBank: 0 sequences

MITOMAP (mitomap.org), CC BY 3.0 · disease table as of 2026-10-07

Where it sits in the mitochondrial genome

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proteinrRNAtRNAouter ring H-strand · inner L-strandMITOMAP confirmedreported (as of 2026-10-07)

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GACGGGCTCACATCACCCCATAAACAAATAGGTTTGGTCCT

MT-TF · ends m.647

MT-RNR1 · starts m.648

m.622–662 of the revised Cambridge Reference Sequence (NC_012920.1); the boxed base is m.642 T→C.

37 genes from Ensembl (rCRS numbering, matched to MITOMAP’s Gene Loci); landmarks and disease alleles from MITOMAP (CC BY 3.0). Circular layout after MitoWheel.

Open Research Assistant for MT-TF →

External Resources

Franklin (Genoox)

AI-powered curation

MITOMAP

mtDNA variant database · expect a security check

VarSome

Variant interpretation · expect a security check

OMIM

Gene & phenotype

gnomAD

mtDNA frequencies (v3.1)

UCSC Browser

Genome browser

m.642T>C

Resolving variant against ClinVar, gnomAD and Ensembl…

MT-TF:m.642T>C

Where it sits in the mitochondrial genome

Population Allele Frequencies

External Resources

MT-TF:m.642T>C

Where it sits in the mitochondrial genome

Population Allele Frequencies

External Resources