Coffin-Siris syndrome 1
Findings
No curated finding names Coffin-Siris syndrome 1 yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Any Coffin-Siris syndrome in which the cause of the disease is a mutation in the ARID1B gene.
Definition from the Mondo Disease Ontology (MONDO:0007617), read 2026-09-29. CC BY 4.0.
- Inheritance
- Autosomal dominant inheritance
HPO, annotations 2026-09-02
Features
39 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.
- Delayed speech and language developmentHPOHP:0000750
- 9 of 9 reported patients
- Global developmental delayHPOHP:0001263
- 9 of 9 reported patients
- Delayed ability to walkHPOHP:0031936
- 8 of 9 reported patients
- HypotoniaHPOHP:0001252
- 7 of 9 reported patients
- Broad nasal tipHPOHP:0000455
- 6 of 9 reported patients
- Thin upper lip vermilionHPOHP:0000219
- 6 of 9 reported patients
- MyopiaHPOHP:0000545
Show the remaining 27
- SeizureHPOHP:0001250
- 3 of 9 reported patients
- Single transverse palmar creaseHPOHP:0000954
- 3 of 9 reported patients
- StrabismusHPOHP:0000486
- 3 of 9 reported patients
- CryptorchidismHPOHP:0000028
- 1 of 4 reported patients
- BrachycephalyHPOHP:0000248
- 2 of 9 reported patients
- Clinodactyly of the 5th fingerHPOHP:0004209
- 2 of 9 reported patients
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.
- ARID1BHGNC:18040
- Definitive · G2P · Autosomal dominant · 2024
- Strong · Ambry Genetics · Autosomal dominant · 2017
- Strong · Labcorp Genetics (formerly Invitae) · Autosomal dominant · 2023
- Strong · PanelApp Australia · Autosomal dominant · 2025
Where it sits
Other names
7 names
Resolves to: Coffin-Siris syndrome 1
- Also called
- ARID1B-related BAFopathyCSS1hypertrichosis, hyperkeratosis, intellectual disability, and distinctive facial featureshypertrichosis, hyperkeratosis, mental retardation, and distinctive facial featuresintellectual disability, autosomal dominant 12mental retardation, autosomal dominant type 12MRD12