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Equine glucose-6-phosphate dehydrogenase deficiency
S L Stockham1, J W Harvey, D A Kinden
1Department of Veterinary Pathology, University of Missouri-Columbia.
Veterinary Pathology
|September 1, 1994
Summary
Glucose-6-phosphate dehydrogenase (G6PD) deficiency, an X-linked disorder, was identified in a horse for the first time. This genetic condition caused persistent hemolytic anemia and hyperbilirubinemia in the affected colt.
Area of Science:
- Veterinary Medicine
- Genetics
- Hematology
Background:
- Glucose-6-phosphate dehydrogenase (G6PD) deficiency is a common inherited enzyme disorder in humans, characterized by X-linked inheritance.
- This condition has not been previously documented in equine species.
Observation:
- A case of persistent hemolytic anemia and hyperbilirubinemia in an American Saddlebred colt is described.
- The colt exhibited severe G6PD deficiency with associated erythrocyte abnormalities.
Findings:
- Erythrocytes from the deficient colt showed increased hexokinase and pyruvate kinase activities.
- Decreased reduced glutathione and NADP, along with increased oxidized NADP, were noted.
- Morphological changes included eccentrocytosis, pyknocytosis, anisocytosis, macrocytosis, and increased Howell-Jolly bodies. Electron microscopy revealed unique eccentrocyte structures.
- Heinz body formation in response to acetylphenylhydrazine was more pronounced and smaller in the affected colt's erythrocytes.
Implications:
- This report establishes the first documented case of G6PD deficiency in horses.
- The findings provide insights into the pathophysiology of hemolytic anemia in equines.
- Understanding this condition is crucial for diagnosis and management in affected bloodlines.