Mice lacking both subunits of lysosomal beta-hexosaminidase display gangliosidosis and mucopolysaccharidosis.

Abstract:

:The GM2 gangliosidoses, Tay-Sachs and Sandhoff diseases, are caused by mutations in the HEXA (alpha-subunit) and HEXB (beta-subunit) genes, respectively. Each gene encodes a subunit for the heterodimeric lysosomal enzyme, beta-hexosaminidase A (alpha beta), as well as for the homodimers beta-hexosaminidase B (beta beta) and S (alpha alpha). In this study, we have produced mice that have both Hexa and Hexb genes disrupted through interbreeding Tay-Sachs (Hexa-/-) and Sandhoff (Hexb-/-) disease model mice. Lacking both the alpha and beta-subunits these 'double knockout' mice displayed a total deficiency of all forms of lysosomal beta-hexosaminidase including the small amount of beta-hexosaminidase S present in the Sandhoff disease model mice. More surprisingly, these mice showed the phenotypic, pathologic and biochemical features of the mucopolysaccharidoses, lysosomal storage diseases caused by the accumulation of glycosaminoglycans. The mucopolysaccharidosis phenotype is not seen in the Tay-Sachs or Sandhoff disease model mice or in the corresponding human patients. This result demonstrates that glycosaminoglycans are crucial substrates for beta-hexosaminidase and that their lack of storage in Tay-Sachs and Sandhoff diseases is due to functional redundancy in the beta-hexosaminidase enzyme system.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Sango K,McDonald MP,Crawley JN,Mack ML,Tifft CJ,Skop E,Starr CM,Hoffmann A,Sandhoff K,Suzuki K,Proia RL

doi

10.1038/ng1196-348

subject

Has Abstract

pub_date

1996-11-01 00:00:00

pages

348-52

issue

3

eissn

1061-4036

issn

1546-1718

journal_volume

14

pub_type

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