Caring for someone with this diagnosis? Eleplan keeps diagnoses, medications, documents and every specialist in one plan.
Start free with EleplanGabriele-de Vries syndrome
ORPHA:506358Malformation syndrome
Also called YY1 haploinsufficiency syndrome
What it is
A rare genetic multiple congenital anomalies/dysmorphic syndrome characterized by variable developmental delay and intellectual disability, movement disorder or gait abnormalities, and dysmorphic craniofacial features (such as facial asymmetry, broad forehead, posteriorly rotated ears, thick lower lip, micrognathia, or cleft palate). A variety of congenital malformations have been reported in addition, including ocular, renal, cardiac, and joint anomalies, among others. Some patients show behavioral alterations (autism, hyperactivity, or anxiety).
Key facts
- Prevalence
- <1 / 1 000 000
- Age of onset
- Antenatal, Neonatal
- Inheritance
- Autosomal dominant
- Classified as
- Malformation syndrome
Prevalence figures describe populations, not individuals, and are often estimates from a single study. Where the figure is an incidence or a birth prevalence, it says so.
Signs and symptoms
Very common80–99%
6Common30–79%
17- Abnormality of upper lip vermillion
- Atypical behavior
- Delayed ability to walk
- Delayed speech and language development
- Downslanted palpebral fissures
- Facial asymmetry
- Feeding difficulties in infancy
- Gastrostomy tube feeding in infancy
- Hypotonia
- Intellectual disability, mild
- Intellectual disability, moderate
- Intrauterine growth retardation
- Oral-pharyngeal dysphagia
- Periorbital fullness
- Pointed chin
- Posteriorly rotated ears
- Strabismus
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
Gene
ICD-10 codes
ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.
Related health topics
Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
Powered by Eleplan
A rare diagnosis is just the start. Eleplan keeps the whole care plan in one place.
Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, so you are not retelling the same story to every new specialist. With Ellie, your AI care assistant, on top of it. Free to start.