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Any myopathy, lactic acidosis, and sideroblastic anemia in which the cause of the disease is a mutation in the PUS1 gene.
Features include always present findings: Sideroblastic anemia, Muscle weakness, Cytochrome C oxidase-negative muscle fibers, and Ragged-red muscle fibers and others; and common findings: Low muscle tone (hypotonia), Scapular winging, Pigmentary retinopathy, and Generalized hypotonia and others. 36 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Muscles | 8 | Low muscle tone (hypotonia), Generalized hypotonia, Gowers sign |
Lab test results | 4 | Increased circulating lactate concentration, Decreased activity of mitochondrial complex I, Elevated ferritin (iron storage marker) (increased circulating ferritin concentration) |
Blood and immune system | 3 | Sideroblastic anemia, Small red blood cells (microcytic anemia), Pale red blood cells (hypochromic anemia) |
Brain and nerves | 3 | Depressed nasal ridge, Intellectual disability, Exercise intolerance |
Growth and development | 2 | Failure to thrive, Growth delay |
Bones and joints | 2 | Excessive inward curvature of the lower spine (hyperlordosis), Joint hypermobility |
Head and neck | 2 | High palate, Microcephaly |
Eyes | 1 | Pigmentary retinopathy |
Lungs and breathing | 1 | Restrictive ventilatory defect |
Arms and legs | 1 | Generalized limb muscle atrophy |
Hormones | 1 | Delayed puberty |
PUS1 function has not been fully characterized.
Myopathy, lactic acidosis, and sideroblastic anemia 1 is associated with mutations in the PUS1 gene on chromosome 12.
Genetic testing for PUS1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 6 always present features, 14 common features.
No clinical trials have been registered for myopathy, lactic acidosis, and sideroblastic anemia 1.
8 publications have been identified in PubMed for myopathy, lactic acidosis, and sideroblastic anemia 1. Research spans Case Report / Case Series (50%), Review / Meta-Analysis (38%), and Basic Science / Preclinical (13%).
Villafan-Bernal JR (2026). [PMID: 41614925](https://pubmed.ncbi.nlm.nih.gov/41614925/). *Curr Issues Mol Biol*. [Review / Meta-Analysis]
Abbas AA (2026). [PMID: 41675948](https://pubmed.ncbi.nlm.nih.gov/41675948/). *Saudi J Med Med Sci*. [Case Report / Case Series]
Yuan JH (2026). [PMID: 41361485](https://pubmed.ncbi.nlm.nih.gov/41361485/). *J Hum Genet*. [Case Report / Case Series]
Ammar M (2025). [PMID: 39961824](https://pubmed.ncbi.nlm.nih.gov/39961824/). *Ann Hematol*. [Case Report / Case Series]
Parisi L (2025). [PMID: 40438980](https://pubmed.ncbi.nlm.nih.gov/40438980/). *Haematologica*. [Review / Meta-Analysis]
Chen H (2025). [PMID: 38407188](https://pubmed.ncbi.nlm.nih.gov/38407188/). *Int J Neurosci*. [Review / Meta-Analysis]
Kothari SS (2024). [PMID: 39148116](https://pubmed.ncbi.nlm.nih.gov/39148116/). *BMC Med Genomics*. [Case Report / Case Series]
Wang B (2024). [PMID: 38635773](https://pubmed.ncbi.nlm.nih.gov/38635773/). *Blood*. [Basic Science / Preclinical]
Data assembled from 5 of 12 sources · Last updated Sep 20, 2026, 8:45 AM UTC
Online Mendelian Inheritance in Man