KBG syndrome

Dayna Morel Swols, Joseph Foster, Mustafa Tekin

Research output: Contribution to journalReview article

9 Scopus citations

Abstract

Clinical Description: KBG syndrome is characterized by macrodontia of upper central incisors, distinctive craniofacial features such as triangular face, prominent nasal bridge, thin upper lip and synophrys; skeletal findings including short stature, delayed bone age, and costovertebral anomalies; and developmental delay/intellectual disability sometimes associated with seizures and EEG abnormalities. The condition was named KBG syndrome after the initials of the last names of three original families reported in 1975. Epidemiology: The prevalence of KBG syndrome is not established. There are over 100 patients reported in the literature. It is likely that KBG syndrome is underreported due to incomplete recognition and very mild presentations of the disorder in some individuals. KBG syndrome is typically milder in females. Etiology: Causative variants in ANKRD11 have been identified in affected individuals. The vast majority of identified variants are loss of function, which include nonsense and frameshift variants and larger deletions at 16q24.3. Haploinsufficiency appears to be the mechanism of pathogenicity. Genetic Counseling: Familial and de novo cases have been reported. Causative de novo variants occur approximately one third of the time. Transmission follows an autosomal dominant pattern. The syndrome displays inter- and intra-familial variability.

Original languageEnglish (US)
Article number183
JournalOrphanet Journal of Rare Diseases
Volume12
Issue number1
DOIs
StatePublished - Dec 19 2017

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Keywords

  • ANKRD11
  • KBG syndrome
  • Macrodontia
  • Review
  • Short stature

ASJC Scopus subject areas

  • Genetics(clinical)
  • Pharmacology (medical)

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