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Marden-Walker syndrome (MWS) is a malformation syndrome characterized by multiple joint contractures (arthrogryposis), a mask-like face with blepharophimosis, micrognathia, high-arched or cleft palate, low-set ears, decreased muscular bulk, kyphoscoliosis and arachnodactyly.
Features include always present findings: Intellectual disability, Cleft palate, Dandy-Walker malformation, and Sideways curvature of the spine (scoliosis) and others. 49 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Muscles | 5 | Decreased muscle mass, Low muscle tone (hypotonia), Generalized hypotonia |
PIEZO2 function has not been fully characterized.
Marden-Walker syndrome is associated with mutations in the PIEZO2 gene on chromosome 18.
Marden-Walker syndrome is included in newborn screening programs (Methylmalonic Acidemia (Mut)) in all 50 states and 3 territories.
Genetic testing for PIEZO2 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 6 always present features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Marden-Walker syndrome.
4 publications have been identified in PubMed for Marden-Walker syndrome. Research spans Other (25%), Review / Meta-Analysis (25%), and Case Report / Case Series (25%).
Battiston GS (2026). [PMID: 41572728](https://pubmed.ncbi.nlm.nih.gov/41572728/). *American journal of medical genetics. Part A*. [Case Report / Case Series]
Diodato D (2026). [PMID: 41780226](https://pubmed.ncbi.nlm.nih.gov/41780226/). *European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society*. [Review / Meta-Analysis]
Phadke S (2026). [PMID: 42231755](https://pubmed.ncbi.nlm.nih.gov/42231755/). *Am J Med Genet A*. [Other]
Sunnetci-Akkoyunlu D (2025). [PMID: 41153369](https://pubmed.ncbi.nlm.nih.gov/41153369/). *Genes*. [Epidemiology / Natural History]
Data assembled from 7 of 12 sources · Last updated Sep 20, 2026, 11:12 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Marden-Walker syndrome
Head and neck
5 |
Fixed facial expression, Cleft palate, Microcephaly |
Brain and nerves | 3 | Seizure, Intellectual disability, Hypoplasia of the brainstem |
Bones and joints | 3 | Sideways curvature of the spine (scoliosis), Joint contracture of the hand, Excessive outward curvature of the upper spine (kyphosis) |
Eyes | 2 | Strabismus, Ptosis |
Growth and development | 2 | Postnatal growth retardation, Intrauterine growth retardation |
Kidneys and urinary system | 1 | Renal hypoplasia |
Lungs and breathing | 1 | Pulmonary hypoplasia |
Arms and legs | 1 | Joint contracture of the hand |
Pregnancy and birth | 1 | Congenital contracture |