Chromosome 17q21.31 deletion syndrome, also known as Koolen-de Vries syndrome, is a clinically recognizable multisystem disorder characterized by mild- to-moderate intellectual disability, hypotonia, and characteristic dysmorphic facial features. Other clinically important features include epilepsy, heart defects, and urogenital anomalies. The syndrome was initially described in association with microdeletions at the 17q21.31 locus; however, heterozygous mutations in KANSL1, a gene within the common deletion region, can produce the phenotype as well.
Category
Chromosomal abnormality
Brite
Human diseases in ICD-11 classification [BR:br08403]
20 Developmental anomalies
Chromosomal anomalies, excluding gene mutations
LD44 Deletions of the autosomes
H02121 Koolen-De Vries syndrome