Most common chromosomal cause of intellectual disability.
- Specialty
- Pediatrics
- Subspecialty
- Pediatrics / Pediatric genetics
- Sex & age distribution
- Male: affected; Female: affected, equal; Children: yes, congenital
- Gene(s) involved
- None recorded
- Alternative names & eponyms
- Trisomy 21
Etiology & mechanism
Extra copy of chromosome 21.
Gene(s) involved (0)
No gene recorded for this syndrome.
Symptoms & signs (6)
In plain terms, someone with Down syndrome may experience the following — click any to explore related syndromes:
Same gene(s)
Other syndromes that involve one of this syndrome's genes.
Overlapping symptoms
Other syndromes that share symptoms with this one.
Drag nodes, scroll to zoom, click a node to open that syndrome.
Shares symptoms with
2 shared
Allan–Herndon–Dudley syndrome
hypotonia, intellectual disability
2 shared
Coffin–Siris syndrome
hypotonia, intellectual disability
2 shared
Cohen syndrome
hypotonia, intellectual disability
2 shared
Cri du chat syndrome
hypotonia, intellectual disability
2 shared
Crigler–Najjar syndrome
hypotonia, intellectual disability
2 shared
Kleefstra syndrome
hypotonia, intellectual disability
2 shared
Lowe syndrome
hypotonia, intellectual disability
2 shared
Marinesco–Sjögren syndrome
hypotonia, intellectual disability
2 shared
Potocki–Lupski syndrome
hypotonia, intellectual disability
2 shared
Shprintzen–Goldberg syndrome
hypotonia, intellectual disability
Shares genes with
None.
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