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Features include very common findings: Bulbous nose, Pear-shaped nose, Delayed speech and language development, and Low muscle tone (hypotonia) and others; and common findings: Cryptorchidism, Hypospadias, Abnormality of the genitourinary system, and Everted lower lip vermilion and others. 100 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 17 | Delayed speech and language development, Global developmental delay, Atypical behavior |
Phenotype severity distribution: 7 very common features, 39 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Koolen-de Vries syndrome due to a point mutation.
1 publication has been identified in PubMed for Koolen-de Vries syndrome due to a point mutation. Research spans Review / Meta-Analysis (100%).
Pfalzer AC (2024). [PMID: 39081270](https://pubmed.ncbi.nlm.nih.gov/39081270/). *Ther Adv Rare Dis*. [Review / Meta-Analysis]
Data assembled from 4 of 12 sources · Last updated Sep 19, 2026, 3:02 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Koolen-de Vries syndrome due to a point mutation
Bones and joints | 6 | Joint dislocation, Joint hypermobility, Sideways curvature of the spine (scoliosis) |
Heart and blood vessels | 6 | Abnormal heart morphology, Ventricular septal defect, Atrial septal defect |
Head and neck | 5 | Abnormal facial shape, Everted lower lip vermilion, Long face |
Eyes | 5 | Strabismus, Visual impairment, Ptosis |
Skin | 5 | Thickened, rough skin (hyperkeratosis), Eczematoid dermatitis, Hypopigmentation of the skin |
Muscles | 3 | Low muscle tone (hypotonia), Neonatal hypotonia, Damage to the optic nerve (optic atrophy) |
Kidneys and urinary system | 3 | Abnormality of the genitourinary system, Recurrent urinary tract infections, Renal duplication |
Ears | 2 | Hearing loss (hearing impairment), Recurrent otitis media |
Arms and legs | 2 | Positional foot deformity, Prominent fingertip pads |
Blood and immune system | 2 | Recurrent urinary tract infections, Recurrent respiratory infections |
Pregnancy and birth | 1 | Neonatal hypotonia |
Nervous system (morphological) | 1 | Morphological central nervous system abnormality |
Growth and development | 1 | Postnatal growth retardation |
Digestive system | 1 | Feeding difficulties |
Hormones | 1 | Precocious puberty |
Lungs and breathing | 1 | Recurrent respiratory infections |