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Novel mutations in lysosomal neuraminidase identify functional domains and determine clinical severity in sialidosis.

Abstract：

:Lysosomal neuraminidase is the key enzyme for the intralysosomal catabolism of sialylated glycoconjugates and is deficient in two neurodegenerative lysosomal disorders, sialidosis and galactosialidosis. Here we report the identification of eight novel mutations in the neuraminidase gene of 11 sialidosis patients with various degrees of disease penetrance. Comparison of the primary structure of human neuraminidase with the primary and tertiary structures of bacterial sialidases indicated that most of the single amino acid substitutions occurred in functional motifs or conserved residues. On the basis of the subcellular distribution and residual catalytic activity of the mutant neuraminidases we assigned the mutant proteins to three groups: (i) catalytically inactive and not lysosomal; (ii) catalytically inactive, but localized in lysosome; and (iii) catalytically active and lysosomal. In general, there was a close correlation between the residual activity of the mutant enzymes and the clinical severity of disease. Patients with the severe infantile type II disease had mutations from group I, whereas patients with a mild form of type I disease had at least one mutation from group III. Mutations from the second group were mainly found in juvenile type II patients with intermediate clinical severity. Overall, our findings explain the clinical heterogeneity observed in sialidosis and may help in the assignment of existing or new allelic combinations to specific phenotypes.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Bonten EJ,Arts WF,Beck M,Covanis A,Donati MA,Parini R,Zammarchi E,d'Azzo A

doi

10.1093/hmg/9.18.2715

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

2715-25

issue

18

eissn

0964-6906

issn

1460-2083

journal_volume

9

pub_type

杂志文章

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