Dwarfism in Alaskan malamutes: a disease resembling metaphyseal dysplasia in human beings.

Abstract

In a study of 300 Alaskan Malamutes, dwarfism was shown to be an autosomal recessive inherited disease with complete penetrance that resulted in disturbed endochondral bone formation. Osseous growth disturbance was manifest at the metaphyses of tubular bones. Clinical and radiographic changes were very similar to those of rickets, although appositional bone formation rates were normal. Serum calcium, phosphorus, and alkaline phosphatase were within normal limits. Urinary excretion of calcium, phosphate, and amino acids were normal. Excess matrix was formed in the zone of cartilage cell proliferation, and the matrix persisted in the growth plate. Normal stresses resulted in microfractures in the metaphyses with subsequent interference of vascular penetration into the zone of degenerated cartilage cells.

• Authors: R D Sande, J E Alexander, G R Spencer, G A Padgett, W C Davis
• Journal: The American journal of pathology (Am J Pathol) Vol. 106 Issue 2 Pg. 224-36 (Feb 1982) ISSN: 0002-9440 [Print] United States
• PMID: 7065114 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Phosphorus
• Alkaline Phosphatase
• Calcium

Topics

• Alkaline Phosphatase (blood)
• Animals
• Bone Diseases, Developmental (pathology)
• Bone and Bones (analysis, pathology)
• Calcium (blood)
• Cartilage (pathology, ultrastructure)
• Disease Models, Animal
• Dog Diseases (blood, genetics, pathology)
• Dogs
• Dwarfism (blood, genetics, veterinary)
• Osteogenesis
• Phenotype
• Phosphorus (blood)