mitochondrial complex III deficiency nuclear type 2
Findings
No curated finding names mitochondrial complex III deficiency nuclear type 2 yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any mitochondrial complex III deficiency in which the cause of the disease is a mutation in the TTC19 gene.
Definition from the Mondo Disease Ontology (MONDO:0014063), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal recessive inheritance
- Onset and course
- Middle age onset · Juvenile onset · Childhood onset
HPO, annotations 2026-09-02
Features
32 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.
- Decreased activity of mitochondrial complex IIIHPOHP:0011924
- 4 of 4 reported patients
- DysarthriaHPOHP:0001260
- 3 of 4 reported patients
- Gait ataxiaHPOHP:0002066
- 3 of 4 reported patients
- Peripheral axonal degenerationHPOHP:0000764
- 3 of 4 reported patients
- Cerebellar atrophyHPOHP:0001272
- 2 of 4 reported patients
- ComaHPOHP:0001259
- 2 of 4 reported patients
- DysphoniaHPOHP:0001618
Show the remaining 20
- BradykinesiaHPOHP:0002067
- 1 of 4 reported patients
- Central apneaHPOHP:0002871
- 1 of 4 reported patients
- Cerebral cortical atrophyHPOHP:0002120
- 1 of 4 reported patients
- Cognitive regressionHPOHP:0034332
- 1 of 4 reported patients
- DiplopiaHPOHP:0000651
- 1 of 4 reported patients
- DysmetriaHPOHP:0001310
- 1 of 4 reported patients
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.
- TTC19HGNC:26006
- Definitive · G2P · Autosomal recessive · 2015
- Strong · Genomics England PanelApp · Autosomal recessive · 2021
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal recessive · 2018
- Strong · PanelApp Australia · Autosomal recessive · 2025
- Moderate · Ambry Genetics · Autosomal recessive · 2017
Where it sits
Other names
3 names
Resolves to: mitochondrial complex III deficiency nuclear type 2
- Also called
- MC3DN2mitochondrial complex III deficiency caused by mutation in TTC19TTC19 mitochondrial complex III deficiency