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A form of limb-girdle muscular dystrophy characterized by childhood-onset of progressive proximal muscle weakness (leading to reduced ambulation) with myalgia and fatigue, in addition to infantile hyperkinetic movements, truncal ataxia, and intellectual disability. Additional manifestations include scoliosis, hip dysplasia, and less commonly, ocular features (e.g. myopia, cataract) and seizures.
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 11:25 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Features include always present findings: Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration) and Limb-girdle muscular dystrophy; and common findings: Intellectual disability, Myalgia, Brain shrinkage (cerebral atrophy), and Hip dysplasia and others. 44 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 15 | Poor speech, Inability to walk, Dystonia |
Muscles | 9 | Shrinkage of the cerebellum (cerebellar atrophy), Low muscle tone (hypotonia), Muscle spasm |
Digestive system | 6 | Hepatic steatosis, Enlarged liver (hepatomegaly), Elevated circulating hepatic transaminase concentration |
Lab test results | 2 | Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration), Elevated circulating hepatic transaminase concentration |
Eyes | 2 | Strabismus, Cataract |
Growth and development | 2 | Short stature, Intrauterine growth retardation |
Bones and joints | 2 | Excessive inward curvature of the lower spine (hyperlordosis), Sideways curvature of the spine (scoliosis) |
Head and neck | 1 | Microcephaly |
Arms and legs | 1 | Limb-girdle muscular dystrophy |
TRAPPC11 function has not been fully characterized.
Autosomal recessive limb-girdle muscular dystrophy type R18 is associated with mutations in the TRAPPC11 gene on chromosome 4.
Genetic testing for TRAPPC11 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 2 always present features, 8 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
2 clinical trials registered, 2 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
2 publications have been identified in PubMed for autosomal recessive limb-girdle muscular dystrophy type R18. Research spans Review / Meta-Analysis (50%) and Case Report / Case Series (50%).
Chou YT (2026). [PMID: 42279596](https://pubmed.ncbi.nlm.nih.gov/42279596/). *Diagnostics (Basel)*. [Case Report / Case Series]
Politano L (2024). [PMID: 38791328](https://pubmed.ncbi.nlm.nih.gov/38791328/). *Int J Mol Sci*. [Review / Meta-Analysis]