lunes, 18 de marzo de 2013

Newborn screening for hepatorenal tyrosinemia-I... [Clin Biochem. 2013] - PubMed - NCBI

2013 Feb 24. pii: S0009-9120(13)00061-1. doi: 10.1016/j.clinbiochem.2013.02.002. [Epub ahead of print]

Newborn screening for hepatorenal tyrosinemia-I by tandem mass spectrometry using pooled samples: A four-year summary by the New England newborn screening program.

Zytkovicz TH, Sahai I, Rush A, Odewale A, Johnson D, Fitzgerald E, Britton D, Eaton RB.

Source

New England Newborn Screening Program, University of Massachusetts Medical School, Jamaica Plain, MA 02130, USA. Electronic address: thomas.zytkovicz@umassmed.edu.

Abstract

OBJECTIVE:

The objective of this study is to develop an isotope dilution liquid chromatography tandem mass spectrometry assay to screen for hepatorenal tyrosinemia (HT) from newborn filter paper samples using pooled extracts to increase high throughput screening.

DESIGN AND METHODS:

Succinylacetone (SUAC), the marker for HT, was extracted from dried blood spots with the formation of the hydrazone derivative of SUAC; up to eight sample extracts were pooled and the SUAC-derivative was analyzed by mass spectrometry methods with an injection-to-injection time of one minute. If any pooled sample extract screened positive, then the samples comprising the pooled sample were assayed individually.

RESULTS:

Two newborn infants were identified with high levels of SUAC (7 & 23μM) and later confirmed to have HT. Three older children whose initial filter paper samples were taken at 195days to 614days of age with elevated SUAC (range 4.9-5μM) were identified; one of the three had clinical signs of HT and was placed on treatment (diagnosis of the other two are unavailable).