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Syndrome reference sheet
Generated 12 Oct 2026
Genetics · Genetics / Single-gene syndromes

Opitz–Kaveggia syndrome

Also known as: FG syndrome

X-linked intellectual disability with macrocephaly and imperforate anus.

Medical specialty
Genetics
Subspecialty
Genetics / Single-gene syndromes
Sex & age distribution
Male: affected, X-linked; Female: carriers; Children: yes
Gene(s) involved
CASK, FLNA, MED12, UPF3B, ZDHHC9

Etiology & mechanism

MED12 mutation.

Gene(s) involved (5)

CASKFLNAMED12UPF3BZDHHC9

Symptoms & signs (6)

agenesis of corpus callosumbroad thumbsconstipationhypotoniaimperforate anusmacrocephaly
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