Format

Send to

Choose Destination
Circ Cardiovasc Genet. 2009 Oct;2(5):450-6. doi: 10.1161/CIRCGENETICS.109.862920. Epub 2009 Jul 24.

High incidence of the cardiac variant of Fabry disease revealed by newborn screening in the Taiwan Chinese population.

Author information

1
Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.

Abstract

BACKGROUND:

Fabry disease is a treatable lysosomal storage disorder, which is often misdiagnosed or belatedly diagnosed.

METHODS AND RESULTS:

To determine the disease incidence in the Taiwan Chinese population, a Fabry disease newborn screening study was initiated. A total of 110 027 newborns were screened by assaying the alpha-galactosidase A (alpha-Gal A) activity using dry blood spots. Low plasma alpha-Gal A activity and presence of a Fabry mutation was demonstrated in 45 neonates (3 females). Eight different mutations were identified, including 3 known missense mutations (R112H, A143T, and R356W), 4 novel missense mutations (G104V, M296L, G360C, and K391T), and one known intronic mutation (IVS4+919G-->A). The IVS4+919G-->A mutation was most common (82% of patients). A total of 20 maternal grandparents of infants harboring this intronic mutation were evaluated by echocardiography, mutation analysis and alpha-Gal A activity assay. The intronic mutation was found in 9 grandfathers and 11 grandmothers. Of these grandparents, 3 grandfathers (33%) but none of the grandmothers had hypertrophic cardiomyopathy. Additionally, 16 males who had been diagnosed with idiopathic hypertrophic cardiomyopathy were screened by mutation analysis and alpha-Gal A activity; 4 (25%) showed deficient plasma alpha-Gal A activity in combination with the intronic mutation.

CONCLUSIONS:

We found an unexpected high prevalence of the cardiac variant Fabry mutation IVS4+919G-->A among both newborns (approximately 1 in 1600 males) and patients with idiopathic hypertrophic cardiomyopathy in the Taiwan Chinese population. The early identification of undiagnosed patients allows timely therapeutic intervention providing a better clinical outcome.

PMID:
20031620
DOI:
10.1161/CIRCGENETICS.109.862920
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center