mitochondrial DNA depletion syndrome, myopathic form
Findings
No curated finding names mitochondrial DNA depletion syndrome, myopathic form yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
A rare mitochondrial DNA depletion syndrome characterized by muscle weakness, and progressive, generalized hypotonia due to depletion of mtDNA in skeletal muscles. Clinical progression ranges from rapid and early fatal course due to respiratory failure, to slowly progressive myopathy over the course of childhood or even early adulthood.
Definition from the Mondo Disease Ontology (MONDO:0012301), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal recessive inheritance
- Onset and course
- Infantile onset · Progressive · Death in childhood · Childhood onset
HPO, annotations 2026-09-02
Features
45 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Elevated circulating creatine kinase activityHPOHP:0003236
- 4 of 4 reported patients
- Generalized hypotoniaHPOHP:0001290
- 4 of 4 reported patients
- Very frequent (80% to 99% of cases)
- MyopathyHPOHP:0003198
- Obligate (100% of cases)
- Respiratory insufficiency due to muscle weaknessHPOHP:0002747
- 4 of 4 reported patients
- Frequent (30% to 79% of cases)
- Motor deteriorationHPOHP:0002333
- Very frequent (80% to 99% of cases)
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- TK2HGNC:11831
- Definitive · G2P · Autosomal recessive · 2015
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal recessive · 2023
- Strong · PanelApp Australia · Autosomal recessive · 2025
Where it sits
Other names
3 names
Resolves to: mitochondrial DNA depletion syndrome, myopathic form
- Also called
- mitochondrial DNA depletion syndrome type 2mtDNA depletion syndrome, myopathic formThymidine Kinase 2 Deficiency