Mr. Islam et al., BETA-GLUCURONIDASE P408S, P415L MUTATIONS - EVIDENCE THAT BOTH MUTATIONS COMBINE TO PRODUCE AN MPS-VII ALLELE IN CERTAIN MEXICAN PATIENTS, Human genetics, 98(3), 1996, pp. 281-284
Mucopolysaccharidosis type VII (MPS VII, Sly syndrome) is an autosomal
recessively inherited lysosomal storage disease caused by a deficienc
y in beta-glucuronidase. We identified and studied a novel allele cont
aining two C-to-T transitions resulting in P408S and P415L alterations
, which is present in homozygous state in one Mexican patient and in h
eterozygous state in another. None of the previous reports describing
mutations in the MPS VII gene include Mexican patients. Expression of
either of the mutations individually showed only modest effects on the
properties of the enzyme. However, expression of the doubly mutant al
lele resulted in markedly reduced activity and rapid degradation in an
early biosynthetic compartment.