title: Uveal coloboma: clinical and basic science update.
abstract: OBJECTIVE
  To integrate knowledge on the embryologic and molecular basis of optic fissure closure with clinical observations in patients with uveal coloboma.
  
  
  RESULTS
  Closure of the optic fissure has been well characterized and many genetic alterations have been associated with coloboma; however, molecular mechanisms leading to coloboma remain largely unknown. In the past decade, we have gained better understanding of genes critical to eye development; however, mutations in these genes have been found in few individuals with coloboma. CHD7 mutations have been identified in patients with CHARGE syndrome (coloboma, heart defects, choanal atresia, retarded growth, genital anomalies, and ear anomalies or deafness). Animal models are bringing us closer to a molecular understanding of optic fissure closure.
  
  
  CONCLUSIONS
  Optic fissure closure requires precise orchestration in timing and apposition of two poles of the optic cup. The relative roles of genetics and environment on this process remain elusive. While most cases of coloboma are sporadic, autosomal dominant, autosomal recessive, and X-linked inheritance patterns have been described. Genetically, colobomata demonstrate pleiotropy, heterogeneity, variable expressivity, and reduced penetrance. Coloboma is a complex disorder with a variable prognosis and requires regular examination to optimize visual acuity and to monitor for potential complications.
authors.affiliation: National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: Lan
authors.initials: L
authors.lastname: Chang
authors.forename: Delphine
authors.initials: D
authors.lastname: Blain
authors.forename: Stefano
authors.initials: S
authors.lastname: Bertuzzi
authors.forename: Brian P
authors.initials: BP
authors.lastname: Brooks
mesh_terms: D001766:Blindness / Q000209:etiology; D003103:Coloboma / Q000150:complications* / Q000175:diagnosis / Q000235:genetics; D006801:Humans; D014602:Uvea / Q000002:abnormalities*