title: Equine Multiple Congenital Ocular Anomalies (MCOA) syndrome in PMEL17 (Silver) mutant ponies: five cases.
abstract: OBJECTIVE
  To describe the clinical phenotype and genetics of equine Multiple Congenital Ocular Anomalies (MCOA) syndrome in PMEL17 (Silver) mutant ponies.
  
  
  METHODS
  Five presumably unrelated ponies.
  
  
  METHODS
  The ponies were examined under field conditions in their barn by slit lamp biomicroscopy, indirect ophthalmoscopy, and applanation tonometry. Blood was collected and genomic DNA extracted for MCOA genotyping using the PMEL17ex11 marker.
  
  
  RESULTS
  One pony solely presented with temporal ciliary body cysts, suggestive of the less severe Cyst phenotype of MCOA; the animal was heterozygous at the MCOA locus. Multiple bilateral anterior segment anomalies were identified in four ponies, consistent with the more severe MCOA phenotype characterized by cornea globosa, iris hypoplasia, encircling granula iridica along the pupillary ruff, and cataracts. These animals were homozygous for the mutant MCOA allele. Four of the ponies had a silver dapple or chocolate coat color with white or flaxen manes and tails. Silver dappling was masked by the palomino coloring of a 5th pony that was homozygous at the MCOA locus.
  
  
  CONCLUSIONS
  The MCOA syndrome can be seen in ponies. The results of both clinical evaluation and genotyping resembled the previously described MCOA of both Rocky Mountain and Kentucky Mountain Saddle horses.
authors.affiliation: Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. komaromy@vet.upenn.edu
authors.forename: András M
authors.initials: AM
authors.lastname: Komáromy
authors.forename: Jessica S
authors.initials: JS
authors.lastname: Rowlan
authors.forename: Noelle C
authors.initials: NC
authors.lastname: La Croix
authors.forename: Brendan G
authors.initials: BG
authors.lastname: Mangan
mesh_terms: D000818:Animals; D005128:Eye Diseases / Q000151:congenital / Q000235:genetics* / Q000473:pathology; D005260:Female; D005786:Gene Expression Regulation; D005838:Genotype; D006734:Horse Diseases / Q000235:genetics* / Q000473:pathology; D006736:Horses; D008297:Male; D009154:Mutation; D058951:gp100 Melanoma Antigen / Q000235:genetics / Q000378:metabolism*
chemical_list: D058951:gp100 Melanoma Antigen