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MORM syndrome is characterized by the association of intellectual deficit, truncal obesity, retinal dystrophy and micropenis. It has been described in 14 individuals from a consanguineous family. It is transmitted in an autosomal recessive manner. The causative locus has been mapped to chromosome region 9q34.
Features include always present findings: Moderate intellectual disability, Delayed speech and language development, and Childhood-onset truncal obesity; and very common findings: Visual impairment. 20 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 7 | Moderate intellectual disability, Delayed speech and language development, Spasticity |
Eyes | 5 | Cataract, Retinal dystrophy, Visual impairment |
Muscles | 2 | Low muscle tone (hypotonia), Retinal atrophy |
Kidneys and urinary system | 1 | Abnormality of the kidney |
Age of onset: childhood, infancy, adolescence.
INPP5E encodes inositol polyphosphate-5-phosphatase E (644 aa). Phosphatidylinositol (PtdIns) phosphatase that specifically hydrolyzes the 5-phosphate of phosphatidylinositol-3,4,5-trisphosphate (PtdIns(3,4,5)P3), phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2) and phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2). Highest expression in Testis (29.9 TPM) and Brain Cerebellum (27.5 TPM).
MORM syndrome has been associated with mutations in the INPP5E gene on chromosome 9.
The INPP5E protein participates in INPP5E translocates to the primary cilium, PDE6D dissociates from ARL13B:INPP5E, and ARL13B-mediated ciliary trafficking of INPP5E pathways.
INPP5E is classified as a druggable target (Druggable Genome and Enzyme categories) with score 0.0.
Genetic testing for INPP5E is available. Testing is considered supportive for diagnosis.
Biomarker and diagnostic research for MORM syndrome has been reported in the published literature.
Phenotype severity distribution: 3 always present features, 1 very common feature, 7 common features.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for MORM syndrome.
193 publications have been identified in PubMed for MORM syndrome. Kisho has analyzed 106 by research type. Research spans Review / Meta-Analysis (34%), Basic Science / Preclinical (30%), and Case Report / Case Series (21%).
Research Type | Count | % of Total |
|---|---|---|
Research summaries | 36 | 34% |
Laboratory research | 32 | 30% |
Patient case studies | 22 | 21% |
Disease patterns and progression | 12 | 11% |
Other research | 1 | 1% |
Testing and diagnosis research | 1 | 1% |
Clinical study results | 1 | 1% |
New treatment approaches | 1 | 1% |
Tripathi M (2026). [PMID: 36256770](https://pubmed.ncbi.nlm.nih.gov/36256770/). *Unknown Journal*. [Epidemiology / Natural History]
Pichon E (2026). [PMID: 41025404](https://pubmed.ncbi.nlm.nih.gov/41025404/). *Mov Disord Clin Pract*. [Review / Meta-Analysis]
Liman MNP (2026). [PMID: 32644338](https://pubmed.ncbi.nlm.nih.gov/32644338/). *Unknown Journal*. [Case Report / Case Series]
Hindermann M (2026). [PMID: 41729076](https://pubmed.ncbi.nlm.nih.gov/41729076/). *JCI Insight*. [Basic Science / Preclinical]
Xu X (2026). [PMID: 42138082](https://pubmed.ncbi.nlm.nih.gov/42138082/). *J Clin Invest*. [Basic Science / Preclinical]
Radio FC (2026). [PMID: 41904678](https://pubmed.ncbi.nlm.nih.gov/41904678/). *Genet Med*. [Basic Science / Preclinical]
Anderson EN (2026). [PMID: 41468891](https://pubmed.ncbi.nlm.nih.gov/41468891/). *Am J Hum Genet*. [Case Report / Case Series]
Clay S (2025). [PMID: 40326698](https://pubmed.ncbi.nlm.nih.gov/40326698/). *Am J Med Genet A*. [Case Report / Case Series]
Ferroul F (2025). [PMID: 41005613](https://pubmed.ncbi.nlm.nih.gov/41005613/). *Eur J Med Genet*. [Case Report / Case Series]
Ay A (2025). [PMID: 40125923](https://pubmed.ncbi.nlm.nih.gov/40125923/). *Ophthalmic Genet*. [Case Report / Case Series]
Data assembled from 7 of 12 sources · Last updated Sep 19, 2026, 9:26 PM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about MORM syndrome