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Any mitochondrial complex IV deficiency in which the cause of the disease is a mutation in the SURF1 gene.
Features include always present findings: Low muscle tone (hypotonia), Ataxia, Generalized hypotonia, and Failure to thrive and others. 40 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 8 | Seizure, Ataxia, Intellectual disability |
SURF1 function has not been fully characterized.
Mitochondrial complex IV deficiency, nuclear type 1 is associated with mutations in the SURF1 gene on chromosome 9.
Genetic testing for SURF1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 12 always present features.
No clinical trials have been registered for mitochondrial complex IV deficiency, nuclear type 1.
8 publications have been identified in PubMed for mitochondrial complex IV deficiency, nuclear type 1. Research spans Other (25%), Review / Meta-Analysis (25%), and Case Report / Case Series (25%).
Smith TB (2025). [PMID: 39701103](https://pubmed.ncbi.nlm.nih.gov/39701103/). *Am J Hum Genet*. [Basic Science / Preclinical]
Zilber S (2025). [PMID: 41267082](https://pubmed.ncbi.nlm.nih.gov/41267082/). *Res Involv Engagem*. [Other]
Kaiyrzhanov R (2025). [PMID: 39963288](https://pubmed.ncbi.nlm.nih.gov/39963288/). *Brain Commun*. [Other]
Zhang X (2024). [PMID: 39850733](https://pubmed.ncbi.nlm.nih.gov/39850733/). *Front Neurol*. [Review / Meta-Analysis]
Shao L (2024). [PMID: 39702527](https://pubmed.ncbi.nlm.nih.gov/39702527/). *Cell Death Dis*. [Basic Science / Preclinical]
Misceo D (2024). [PMID: 38674434](https://pubmed.ncbi.nlm.nih.gov/38674434/). *Genes (Basel)*. [Case Report / Case Series]
Data assembled from 5 of 12 sources · Last updated Sep 19, 2026, 9:39 PM UTC
Online Mendelian Inheritance in Man
Genetic and Rare Diseases Info Center
6 |
Low muscle tone (hypotonia), Generalized hypotonia, Weakness of facial musculature |
Lungs and breathing | 4 | Respiratory failure, Exertional dyspnea, Respiratory distress |
Digestive system | 3 | Decreased liver function, Enlarged liver (hepatomegaly), Increased hepatocellular lipid droplets |
Eyes | 3 | Pigmentary retinopathy, Ptosis, Damage to the optic nerve (optic atrophy) |
Kidneys and urinary system | 3 | Protein in the urine (proteinuria), Renal tubular dysfunction, Renal Fanconi syndrome |
Head and neck | 2 | Weakness of facial musculature, High palate |
Growth and development | 1 | Failure to thrive |
Blood and immune system | 1 | Low red blood cell count (anemia) |
Lab test results | 1 | Increased circulating lactate concentration |
Ears | 1 | Inner ear hearing loss (sensorineural hearing impairment) |
Heart and blood vessels | 1 | Thickened heart muscle (hypertrophic cardiomyopathy) |
Tavasoli A (2024). [PMID: 38846886](https://pubmed.ncbi.nlm.nih.gov/38846886/). *Ann Med Surg (Lond)*. [Case Report / Case Series]
Henke MT (2024). [PMID: 39385390](https://pubmed.ncbi.nlm.nih.gov/39385390/). *J Inherit Metab Dis*. [Review / Meta-Analysis]