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Autosomal recessive limb-girdle muscular dystrophy type 2P (LGMD2P) is a form of limb-girdle muscular dystrophy characterized by slowly-progressive mainly proximal muscle weakness presenting in early childhood (with difficulties walking and climbing stairs) and mild to severe intellectual disability. Additional manifestations reported include microcephaly, mild increase in thigh or calf muscles, and contractures of the ankles.
Features include always present findings: Delayed speech and language development, Difficulty walking (gait disturbance), Hypoglycosylation of alpha-dystroglycan, and Global developmental delay and others; and very common findings: Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration), Limb-girdle muscular dystrophy, and Reduced muscle fiber alpha dystroglycan. 22 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 9 | Delayed speech and language development, Difficulty walking (gait disturbance), Global developmental delay |
Muscles | 9 | Difficulty climbing stairs, Progressive muscle deterioration (muscular dystrophy), Gowers sign |
Arms and legs | 2 | Limb-girdle muscle weakness, Limb-girdle muscular dystrophy |
Lab test results | 1 | Elevated creatine kinase (muscle enzyme) (elevated circulating creatine kinase concentration) |
Bones and joints | 1 | Excessive inward curve of the lower back (lumbar hyperlordosis) |
DAG1 encodes dystroglycan 1 (895 aa). The dystroglycan complex is involved in a number of signaling events and processes including laminin deposition and extracellular matrix assembly, acetylcholine receptor clustering, sarcolemmal stability, cell survival, peripheral nerve myelination, nodal structure, cell migration, epithelial polarization, and epithelium branching morphogenesis. Highest expression in Nerve Tibial (118.7 TPM) and Artery Tibial (71.1 TPM).
Autosomal recessive limb-girdle muscular dystrophy type 2P is associated with mutations in the DAG1 gene on chromosome 3.
The DAG1 protein participates in DAG1 glycosylations pathway.
DAG1 is classified as a druggable target (Druggable Genome, External Side Of Plasma Membrane, and Transporter categories) with score 52.2.
Genetic testing for DAG1 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for autosomal recessive limb-girdle muscular dystrophy type 2P has been reported in the published literature.
Phenotype severity distribution: 6 always present features, 3 very common features, 6 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.
1 publication has been identified in PubMed for autosomal recessive limb-girdle muscular dystrophy type 2P. Research spans Diagnostic / Biomarker (100%).
Mohan S (2024). [PMID: 39215466](https://pubmed.ncbi.nlm.nih.gov/39215466/). *Ann Clin Transl Neurol*. [Diagnostic / Biomarker]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 8:03 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center