A Population-Based Study on Congenital Disorders of Protein N- and Combined with O-Glycosylation Experience in Clinical and Genetic Diagnosis.

Abstract

OBJECTIVE:

To describe the clinical, biochemical, and genetic features of patients with congenital disorders of glycosylation (CDG) identified in Spain during the last 20 years.

STUDY DESIGN:

Patients were selected among those presenting with multisystem disease of unknown etiology. The isoforms of transferrin and of ApoC3 and dolichols were analyzed in serum; phosphomannomutase and mannosephosphate isomerase activities were measured in fibroblasts. Conventional or massive parallel sequencing (customized panel or Illumina Clinical-Exome Sequencing TruSight One Gene Panel) was used to identify genes and mutations.

RESULTS:

Ninety-seven patients were diagnosed with 18 different CDG. Eighty-nine patients had a type 1 transferrin profile; 8 patients had a type 2 transferrin profile, with 6 of them showing an alteration in the ApoC3 isoform profile. A total of 75% of the patients had PMM2-CDG presenting with a heterogeneous mutational spectrum. The remaining patients showed mutations in any of the following genes: MPI, PGM1, GFPT1, SRD5A3, DOLK, DPGAT1, ALG1, ALG6, RFT1, SSR4, B4GALT1, DPM1, COG6, COG7, COG8, ATP6V0A2, and CCDC115.

CONCLUSION:

Based on literature and on this population-based study of CDG, a comprehensive scheme including reported clinical signs of CDG is offered, which will hopefully reduce the timeframe from clinical suspicion to genetic confirmation. The different defects of CDG identified in Spain have contributed to expand the knowledge of CDG worldwide. A predominance of PMM2 deficiency was detected, with 5 novel PMM2 mutations being described.

• Authors: Celia Pérez-Cerdá, Ma Luisa Girós, Mercedes Serrano, M Jesús Ecay, Laura Gort, Belén Pérez Dueñas, Celia Medrano, Alfredo García-Alix, Rafael Artuch, Paz Briones, Belén Pérez
• Journal: The Journal of pediatrics (J Pediatr) Vol. 183 Pg. 170-177.e1 (04 2017) ISSN: 1097-6833 [Electronic] United States
• PMID: 28139241 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2016 Elsevier Inc. All rights reserved.

Chemical References

• APOC4 protein, human
• Apolipoproteins C
• Genetic Markers
• Acetyltransferases
• protein N-terminal acetyltransferase

Topics

• Acetyltransferases (genetics, metabolism)
• Apolipoproteins C (genetics, metabolism)
• Cohort Studies
• Congenital Disorders of Glycosylation (diagnosis, epidemiology)
• Databases, Factual
• Female
• Genetic Markers
• Genetic Predisposition to Disease
• Genetic Testing (methods)
• Humans
• Incidence
• Infant, Newborn
• Male
• Mutation
• Retrospective Studies
• Risk Assessment
• Spain (epidemiology)