Screening patients referred to a metabolic clinic for lysosomal storage disorders.

Abstract:

BACKGROUND:Lysosomal protein profiling is being developed as a high throughput method to screen populations for lysosomal storage disorders (LSD). DESIGN:1415 blood spots from patients referred to a metabolic clinic for LSD were screened using a single multiplex assay for 14 proteins in a dried blood spot. RESULTS:All patients with Pompe disease, metachromatic leukodystrophy, and mucopolysaccharidosis (MPS) type I, IIIA, IIIB and VI were identified by reduced lysosomal protein. Five samples were identified as possible pseudo-arylsulfatase A deficiency; four were confirmed. One multiple sulfatase deficiency patient was identified with multiple reduced sulfatase proteins. There were 10 MPS II patients identified with reduced iduronate 2-sulfatase, and one MPS II patient with iduronate 2-sulfatase in the unaffected range. For Fabry disease, 10 male patients were identified with reduced α-galactosidase and 2/6 female Fabry heterozygotes returned α-galactosidase concentrations in the male Fabry range. All 10 mucolipidosis II/III patients were identified with multiple raised proteins. For 79 blood spots with chitotriosidase >3.4mg/l, a follow-up one-plex chitotriosidase assay enabled identification of all nine Gaucher patients. CONCLUSION:This study demonstrates the sensitivity and specificity of this technology to accurately identify 99% of LSD patients, with the exception of one MPS II false negative.

journal_name

J Med Genet

authors

Fuller M,Tucker JN,Lang DL,Dean CJ,Fietz MJ,Meikle PJ,Hopwood JJ

doi

10.1136/jmg.2010.088096

subject

Has Abstract

pub_date

2011-06-01 00:00:00

pages

422-5

issue

6

eissn

0022-2593

issn

1468-6244

pii

jmg.2010.088096

journal_volume

48

pub_type

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