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Science 27 May 1977:
Vol. 196. no. 4293, pp. 1014 - 1017
DOI: 10.1126/science.404709
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Articles

Science, Vol 196, Issue 4293, 1014-1017
Copyright © 1977 by American Association for the Advancement of Science

articles

GM2 ganglioside lysosomal storage disease in cats with beta-hexosaminidase deficiency

LC Cork, JF Munnell, MD Lorenz, JV Murphy, HJ Baker, and MC Rattazzi

Two kitteens with progressive neurologic disease had increased concentrations of GM2 ganglioside in their cerebral cortex. Examination under the light microscope revealed cytoplasmic vacuolation of neurons and hepatocytes. Transmission and scanning electron microscopy demosntrated cytoplasmic inclusions encompassed by membranes in various central nervous system cell types and in hepatocytes. Beta-D-N-acetyl-hexosaminidase activity was reduced to about 1.0 percent of normal in brain, liver, and cultured skin fibroblasts of the diseased kittens; both major electrophoretic forms, A and B, of the enzyme were deficient. In fibroblasts from the parents of the diseased kittens, this enzyme activity was intermediate between that of affected and normal cats, suggesting an autosomal recessive mode of inheritance of the enzyme defect. Histopahtological and ultrastructural lesions, glycolipid storage, enzyme defect, and pattern of inheritance are similar to those of human GM2 gangliosidosis type 2.


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