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Autosomal recessive limb-girdle muscular dystrophy type 2T (LGMD2T) is a form of limb-girdle muscular dystrophy, that can present from birth to early childhood, characterized by hypotonia, microcephaly, mild proximal muscle weakness (leading to delayed walking and difficulty climbing stairs), mild intellectual disability and epilepsy. Additional manifestations reported in some patients include cataracts, nystagmus, cardiomyopathy, and respiratory insufficiency.
Features include always present findings: Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration), Hypoglycosylation of alpha-dystroglycan, and Limb-girdle muscle weakness; and common findings: Microcephaly, Mild intellectual disability, Seizure, and Low muscle tone (hypotonia) and others. 15 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Muscles | 4 | Low muscle tone (hypotonia), Progressive muscle deterioration (muscular dystrophy), Proximal muscle weakness |
Brain and nerves | 3 | Mild intellectual disability, Seizure, Exercise intolerance |
Eyes | 2 | Cataract, Nystagmus |
Lab test results | 1 | Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration) |
Head and neck | 1 | Microcephaly |
Lungs and breathing | 1 | Difficulty breathing (respiratory insufficiency) |
Heart and blood vessels | 1 | Heart muscle disease (cardiomyopathy) |
Arms and legs | 1 | Limb-girdle muscle weakness |
GMPPB encodes GDP-mannose pyrophosphorylase B (360 aa). Catalytic subunit of the GMPPA-GMPPB mannose-1-phosphate guanylyltransferase complex. Highest expression in Pituitary (56.4 TPM) and Thyroid (41.5 TPM).
Autosomal recessive limb-girdle muscular dystrophy type 2T is associated with mutations in the GMPPB gene on chromosome 3.
The GMPPB protein participates in GMPPB converts Mannose-1-phosphate to GDP-Mannose pathway.
GMPPB is classified as a druggable target (Enzyme category) with score 0.0.
Genetic testing for GMPPB is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 3 always present features, 9 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.
100 publications have been identified in PubMed for autosomal recessive limb-girdle muscular dystrophy type 2T. Kisho has analyzed 52 by research type. Research spans Other (46%), Review / Meta-Analysis (37%), and Epidemiology / Natural History (10%).
Research Type | Count | % of Total |
|---|---|---|
Other research | 24 | 46% |
Research summaries | 19 | 37% |
Disease patterns and progression | 5 | 10% |
Clinical study results | 4 | 8% |
Smith M (2026). [PMID: 41421115](https://pubmed.ncbi.nlm.nih.gov/41421115/). *Acta Psychol (Amst)*. [Other]
Li S (2026). [PMID: 41379706](https://pubmed.ncbi.nlm.nih.gov/41379706/). *J Fam Psychol*. [Review / Meta-Analysis]
Donohue GF (2026). [PMID: 41793381](https://pubmed.ncbi.nlm.nih.gov/41793381/). *Eur J Pain*. [Review / Meta-Analysis]
Marshall KH (2025). [PMID: 39838237](https://pubmed.ncbi.nlm.nih.gov/39838237/). *Qual Life Res*. [Epidemiology / Natural History]
Lawson M (2025). [PMID: 39977677](https://pubmed.ncbi.nlm.nih.gov/39977677/). *Dev Psychol*. [Other]
Antunes LAA (2025). [PMID: 40946147](https://pubmed.ncbi.nlm.nih.gov/40946147/). *Pediatr Dent*. [Review / Meta-Analysis]
Campbell JI (2025). [PMID: 39509188](https://pubmed.ncbi.nlm.nih.gov/39509188/). *Curr Opin Pediatr*. [Review / Meta-Analysis]
Goodrich J (2025). [PMID: 40925213](https://pubmed.ncbi.nlm.nih.gov/40925213/). *Int J Nurs Stud*. [Other]
Taki S (2025). [PMID: 40785243](https://pubmed.ncbi.nlm.nih.gov/40785243/). *Int J Nurs Pract*. [Clinical Trial Publication]
Flynn P (2025). [PMID: 40578827](https://pubmed.ncbi.nlm.nih.gov/40578827/). *Sleep*. [Review / Meta-Analysis]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 12:33 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center