Linkage mapping of the primary disease locus for collie eye anomaly.
Collie eye anomaly (cea) is a hereditary ocular disorder affecting development of the choroid and sclera segregating in several breeds of dog, including rough, smooth, and Border collies and Australian shepherds. The disease is reminiscent of the choroidal hypoplasia phenotype observed in humans in conjunction with craniofacial or renal abnormalities. In dogs, however, the clinical phenotype can vary significantly; many dogs exhibit no obvious clinical consequences and retain apparently normal vision throughout life, while severely affected animals develop secondary retinal detachment, intraocular hemorrhage, and blindness. We report genetic studies establishing that the primary cea phenotype, choroidal hypoplasia, segregates as an autosomal recessive trait with nearly 100% penetrance. We further report linkage mapping of the primary cea locus to a 3.9-cM region of canine chromosome 37 (LOD = 22.17 at theta = 0.076), in a region corresponding to human chromosome 2q35. These results suggest the presence of a developmental regulatory gene important in ocular embryogenesis, with potential implications for other disorders of ocular vascularization.
Lowe
Jennifer K
JK
Division of Human Biology, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, D4-100, Seattle, WA 98109-1024, USA.
Kukekova
Anna V
AV
Kirkness
Ewen F
EF
Langlois
Mariela C
MC
Aguirre
Gustavo D
GD
Acland
Gregory M
GM
Ostrander
Elaine A
EA
D000818:Animals; D002829:Choroid / Q000002:abnormalities; D002874:Chromosome Mapping; D033481:Chromosomes, Mammalian; D004283:Dog Diseases / Q000235:genetics*; D004285:Dogs; D005124:Eye Abnormalities / Q000235:genetics / Q000473:pathology / Q000662:veterinary*; D005260:Female; D005808:Genes, Recessive; D008040:Genetic Linkage; D005819:Genetic Markers; D008126:Lod Score; D008297:Male; D018895:Microsatellite Repeats; D008969:Molecular Sequence Data; D010375:Pedigree; D019683:Penetrance; D021101:Radiation Hybrid Mapping; D026801:Synteny
D005819:Genetic Markers