Koolen-de Vries syndrome
Findings
No curated finding names Koolen-de Vries syndrome yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
A chromosomal anomaly characterized by developmental delay, childhood hypotonia, facial dysmorphism, and a friendly/amiable behavior.
Definition from the Mondo Disease Ontology (MONDO:0012496), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal dominant inheritance · Contiguous gene syndrome
HPO, annotations 2026-09-02
Features
106 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Global developmental delayHPOHP:0001263
- 22 of 22 reported patients
- Very frequent (80% to 99% of cases)
- Generalized hypotoniaHPOHP:0001290
- 21 of 22 reported patients · Childhood onset
- Bulbous noseHPOHP:0000414
- 20 of 21 reported patients
- Very frequent (80% to 99% of cases)
- Conspicuously happy dispositionHPOHP:0100024
- 16 of 18 reported patients
- Pear-shaped noseHPOHP:0000447
- 18 of 22 reported patients
- BlepharophimosisHPOHP:0000581
- 8 of 22 reported patients
- Very frequent (80% to 99% of cases)
Show the remaining 94
- Intellectual disabilityHPOHP:0001249
- Very frequent (80% to 99% of cases)
- Long faceHPOHP:0000276
- 14 of 22 reported patients
- Very frequent (80% to 99% of cases)
- Overfolded helixHPOHP:0000396
- Very frequent (80% to 99% of cases)
- Prominent nasal bridgeHPOHP:0000426
- Very frequent (80% to 99% of cases)
- Protruding earHPOHP:0000411
- Very frequent (80% to 99% of cases)
- PtosisHPOHP:0000508
Genes
1 gene
Germline variants in the gene encoding each protein, as classified by GenCC submitters, each in their own words. Limited, disputed and refuted submissions are listed too.
- KANSL1HGNC:24565
- Definitive · Ambry Genetics · Autosomal dominant · 2025
- Definitive · ClinGen · Autosomal dominant · 2022
- Definitive · G2P · Autosomal dominant · 2015
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal dominant · 2022
- Strong · PanelApp Australia · Autosomal dominant · 2025
Where it sits
Other names
5 names
Resolves to: Koolen-de Vries syndrome
- Also called
- chromosome 17q21.31 deletion syndromeKANSL1-related intellectual disability syndromeKDVSKoolen de Vries syndromemicrodeletion 17q21.31 syndrome