Outcome of Later-Onset Pompe Disease Identified Through Newborn Screening

J Pediatr. 2022 May;244:139-147.e2. doi: 10.1016/j.jpeds.2021.12.072. Epub 2022 Jan 4.


Objective: To determine the outcomes of patients with later-onset Pompe disease (LOPD) identified through newborn screening (NBS).

Study design: A prospective observational cohort study was conducted from the initiation of Pompe disease NBS by following subjects every 3-12 months for motor development and biochemical markers.

Results: Between 2005 and 2018, 39 of 994 975 newborns evaluated were classified as having LOPD based on low acid α-glucosidase (GAA) activity but no cardiac involvement at the time of screening. As of December 2020, 8 of these 39 infants (21%) were treated with enzyme replacement therapy owing to persistent elevation of creatine kinase (CK), cardiac involvement, or developmental delay. All subjects' physical performance and endurance improved after treatment. Subjects carrying c.[752C>T;761C>T] and c.[546+5G>T; 1726G>A] presented a phenotype of nonprogressive hypotonia, muscle weakness, and impairment in physical fitness tests, but they have not received treatment.

Conclusions: One-fifth of subjects identified through NBS as having LOPD developed symptoms after a follow-up of up to 15 years. NBS was found to facilitate the early detection and early treatment of those subjects. GAA variants c.[752C>T;761C>T] and c.[546+5G>T; 1726G>A] might not cause Pompe disease but still may affect skeletal muscle function.

Keywords: enzyme replacement therapy; genetic variations; glycogen storage disease type II; hypotonia; manifestation–neuromuscular.

Publication types

  • Observational Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Enzyme Replacement Therapy
  • Glycogen Storage Disease Type II* / diagnosis
  • Glycogen Storage Disease Type II* / genetics
  • Glycogen Storage Disease Type II* / therapy
  • Humans
  • Infant, Newborn
  • Neonatal Screening
  • Prospective Studies
  • alpha-Glucosidases / genetics


  • alpha-Glucosidases