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Ann Lab Med. 2013 Jul;33(4):274-8. doi: 10.3343/alm.2013.33.4.274. Epub 2013 Jun 24.

Analysis of lyso-globotriaosylsphingosine in dried blood spots.

Author information

1
Division of Clinical and Translational Genetics, Department of Human Genetics, University of Miami-Miller School of Medicine, 1501 NW 10th Ave, Miami, FL 33136, USA.

Abstract

Recently, lyso-globotriaosylsphingosine (lyso-Gb3) was found to be elevated in plasma of treatment naive male patients and some female patients with Fabry Disease (FD). This study tested whether lyso-Gb3 could be analyzed in dried blood spots (DBS) from filter cards and whether concentrations are elevated in newborn infants with FD. Lyso-Gb3 concentrations were analyzed in DBS following extraction using a novel HPLC-mass spectrometry (MS)/MS method. Lyso-Gb3 levels in DBS were above the lower limit of quantitation (0.28 ng/mL) in 5/17 newborn FD infants (16 males; range: 1.02-8.81 ng/mL), but in none of the newborn controls, in all 13 patients (4 males) with classic FD (range: 2.06-54.1 ng/mL), in 125/159 Taiwanese individuals with symptomatic or asymptomatic FD who carry the late onset α-galactosidase A (GLA) mutation c.936+919G>A (IVS4+919G>A) (3.75±0.69 ng/mL; range: 0.418-3.97 ng/mL) and in 20/29 healthy controls (0.77±0.24 ng/mL; range: 0.507-1.4 ng/mL). The HPLC-MS/MS method for analysis of lyso-Gb3 is robust and yields reproducible results in DBS in patients with FD. However, concentrations of lyso-Gb3 were below the limit of quantitation in most newborn infants with FD rendering this approach not suitable for newborn screening. In addition, most females with the late onset mutation have undetectable lyso-Gb3 concentrations.

KEYWORDS:

Dried blood spot; Fabry disease; Filter card; Tandem mass spectrometry

PMID:
23826564
PMCID:
PMC3698306
DOI:
10.3343/alm.2013.33.4.274
[Indexed for MEDLINE]
Free PMC Article

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