🧬 SyndromeScope
Syndrome reference sheet
Generated 12 Oct 2026
Genetics · Genetics / Single-gene syndromes Kleefstra syndrome
Also known as: 9q34 deletion syndrome
Intellectual disability with hypotonia and distinctive facial features.
- Medical specialty
- Genetics
- Subspecialty
- Genetics / Single-gene syndromes
- Sex & age distribution
- Male: affected; Female: affected, equal; Children: yes
- Gene(s) involved
- EHMT1
Etiology & mechanism
EHMT1 haploinsufficiency.
Gene(s) involved (1)
EHMT1
Symptoms & signs (6)
absent speechheart defectshypotoniaintellectual disabilitymicrocephalysynophrys