Pilot study of newborn screening for six lysosomal diseases in Brazil

Francyne Kubaski, Ines Sousa, Tatiana Amorim, Danilo Pereira, Camilo Silva, Vitor Chaves, Ana Carolina Brusius-Facchin, Alice B.O. Netto, Juliano Soares, Filippo Vairo, Edina Poletto, Joe Trometer, Alexandre Souza, Enzo Ranieri, Giulia Polo, Xinying Hong, Zackary M. Herbst, Alberto Burlina, Michael H. Gelb, Roberto Giugliani

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Lysosomal diseases (LDs) are progressive life-threatening disorders that are usually asymptomatic at birth. Specific treatments are available for several LDs, and early intervention improves patient's outcomes. Thus, these diseases benefit from newborn screening (NBS). We have performed a pilot study for six LDs in Brazil by tandem mass spectrometry. Methods: Dried blood spot (DBS) samples of unselected newborns were analyzed by the Neo-LSD™ kit (Perkin-Elmer) by MS/MS. Samples with low enzyme activity were submitted to the evaluation of specific biomarkers by ultra-performance liquid chromatography tandem-mass spectrometry as the second-tier, and were analyzed by a next-generation sequencing (NGS) multi-gene panel as the third-tier. All tests were performed in the same DBS sample. Results: In 20,066 newborns analyzed, 15 samples showed activity of one enzyme below the cutoff. Two newborns had biochemical and molecular results compatible with Fabry disease, and five newborns had biochemical results and pathogenic variants or variants of unknown significance (VUS) in GAA. Conclusions: This study indicates that the use of enzyme assay as the first-tier test gives an acceptably low number of positive results that requires second/third tier testing. The possibility to run all tests in a DBS sample makes this protocol applicable to large-scale NBS programs.

Original languageEnglish (US)
Article number107654
JournalMolecular genetics and metabolism
Volume140
Issue number1-2
DOIs
StatePublished - Sep 1 2023

Keywords

  • Biomarkers
  • Enzyme analysis
  • Lysosomal storage diseases
  • Newborn screening
  • Tandem mass spectrometry

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Endocrinology

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