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Features include always present findings: Enlarged brain ventricles (ventriculomegaly); and very common findings: Joint contracture. 22 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 5 | Hypoplasia of the brainstem, Seizure, Global developmental delay |
FLVCR2 encodes FLVCR choline and putative heme transporter 2 (526 aa). Choline uniporter that specifically mediates choline uptake at the blood-brain-barrier. Highest expression in Nerve Tibial (42.2 TPM) and Testis (28.6 TPM).
Fowler syndrome is associated with mutations in the FLVCR2 gene on chromosome 14.
FLVCR2 is classified as a druggable target (Druggable Genome and Transporter categories) with score 0.0.
Genetic testing for FLVCR2 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 1 always present feature, 1 very common feature, 3 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Fowler syndrome.
8 publications have been identified in PubMed for Fowler syndrome. Research spans Case Report / Case Series (57%), Other (14%), and Review / Meta-Analysis (14%).
Huang L (2026). [PMID: 41672241](https://pubmed.ncbi.nlm.nih.gov/41672241/). *Life Sci*. [Review / Meta-Analysis]
Scala M (2026). [PMID: 40133703](https://pubmed.ncbi.nlm.nih.gov/40133703/). *Eur J Hum Genet*. [Case Report / Case Series]
Lazarov V (2025). [PMID: 40802127](https://pubmed.ncbi.nlm.nih.gov/40802127/). *J Assist Reprod Genet*. [Other]
Lazarov V (2025). [PMID: 40660053](https://pubmed.ncbi.nlm.nih.gov/40660053/). *J Assist Reprod Genet*. [Case Report / Case Series]
Ri K (2024). [PMID: 38778100](https://pubmed.ncbi.nlm.nih.gov/38778100/). *Nature*. [Basic Science / Preclinical]
Domínguez-Millán R (2024). [PMID: 39498286](https://pubmed.ncbi.nlm.nih.gov/39498286/). *JPRAS Open*. [Case Report / Case Series]
Data assembled from 6 of 12 sources · Last updated Sep 18, 2026, 3:43 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Fowler syndrome
2 |
Microcephaly, Cleft palate |
Bones and joints | 1 | Joint contracture |
Muscles | 1 | Joint contracture |
Growth and development | 1 | Intrauterine growth retardation |
El-Akri M (2024). [PMID: 38431080](https://pubmed.ncbi.nlm.nih.gov/38431080/). *Fr J Urol*. [Case Report / Case Series]