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Muscle phosphofructokinase (PFK) deficiency (Tarui's disease), or glycogen storage disease type 7 (GSD7), is a rare form of glycogen storage disease characterized by exertional fatigue and muscular exercise intolerance. It occurs in childhood.
Features include always present findings: Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration), Increased total bilirubin, Reduced muscle 6-phosphofructokinase activity, and Exercise-induced muscle fatigue and others; and very common findings: Increased muscle glycogen content, Low red blood cell count (anemia), and Myotonia. 27 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Muscles | 11 | Reduced muscle 6-phosphofructokinase activity, Exercise-induced muscle fatigue, Muscle weakness |
Lab test results | 3 | Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration), Elevated circulating aldolase concentration, Elevated LDH (tissue damage marker) (increased circulating lactate dehydrogenase concentration) |
Blood and immune system | 3 | Increased immature red blood cells (reticulocytosis), Red blood cell destruction (hemolytic anemia), Low red blood cell count (anemia) |
Brain and nerves | 2 | Exercise-induced muscle fatigue, Exercise intolerance |
Digestive system | 2 | Jaundice, Cholelithiasis |
Kidneys and urinary system | 1 | Blood in the urine (hematuria) |
Bones and joints | 1 | Skeletal muscle atrophy |
PFKM function has not been fully characterized.
Glycogen storage disease VII is associated with mutations in the PFKM gene on chromosome 12.
Genetic testing for PFKM is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for glycogen storage disease VII has been reported in the published literature.
Phenotype severity distribution: 7 always present features, 3 very common features, 13 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
1 clinical trial registered, 1 recruiting. Interventions under study include other interventions. Research is primarily sponsored by academic and government institutions.
45 publications have been identified in PubMed for glycogen storage disease VII. Research spans Case Report / Case Series (25%), Review / Meta-Analysis (22%), and Epidemiology / Natural History (17%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 9 | 25% |
Research summaries | 8 | 22% |
Disease patterns and progression | 6 | 17% |
Clinical study results | 5 | 14% |
Testing and diagnosis research | 4 | 11% |
Laboratory research | 4 | 11% |
Costa MP (2026). [PMID: 41797620](https://pubmed.ncbi.nlm.nih.gov/41797620/). *Am J Med Genet A*. [Clinical Trial Publication]
Uçar SK (2026). [PMID: 42070995](https://pubmed.ncbi.nlm.nih.gov/42070995/). *J Inherit Metab Dis*. [Epidemiology / Natural History]
Chen Z (2026). [PMID: 41603948](https://pubmed.ncbi.nlm.nih.gov/41603948/). *Acta Diabetol*. [Review / Meta-Analysis]
Martins JCC (2026). [PMID: 41662339](https://pubmed.ncbi.nlm.nih.gov/41662339/). *PLoS One*. [Clinical Trial Publication]
Mueller MM (2026). [PMID: 41948450](https://pubmed.ncbi.nlm.nih.gov/41948450/). *Orthop J Sports Med*. [Epidemiology / Natural History]
Yuan C (2026). [PMID: 41861207](https://pubmed.ncbi.nlm.nih.gov/41861207/). *Medicine (Baltimore)*. [Case Report / Case Series]
Magner M (2026). [PMID: 41732189](https://pubmed.ncbi.nlm.nih.gov/41732189/). *Mol Genet Metab Rep*. [Case Report / Case Series]
Weinstein DA (2025). [PMID: 40064185](https://pubmed.ncbi.nlm.nih.gov/40064185/). *J Inherit Metab Dis*. [Clinical Trial Publication]
Yang M (2025). [PMID: 41070653](https://pubmed.ncbi.nlm.nih.gov/41070653/). *Zhonghua Yi Xue Yi Chuan Xue Za Zhi*. [Review / Meta-Analysis]
Al-Hussaini A (2025). [PMID: 40743267](https://pubmed.ncbi.nlm.nih.gov/40743267/). *PLoS One*. [Basic Science / Preclinical]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 10:42 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center