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12q15q21.1 microdeletion syndrome

Disease definition

12q15q21.1 microdeletion syndrome is a rare chromosomal anomaly syndrome resulting from a partial deletion of the long arm of chromosome 12, with a highly variable phenotype, typically characterized by developmental delay, learning disability, intra-uterine and postnatal growth retardation, and mild facial dysmorphism that changes with age. Nasal speech and hypothyroidism are also associated.


Classification level: Disorder
  • Synonym(s):
    • Del(12)(q15)(q21.1)
    • Deletion 12q15q21.1
    • Monosomy 12q15q21.1
  • Prevalence: <1 / 1 000 000
  • Inheritance: -
  • Age of onset: Infancy, Neonatal
  • ICD-10: Q93.5
  • OMIM: -
  • UMLS: -
  • MeSH: -
  • GARD: -
  • MedDRA: -

Detailed information


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