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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
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