GMPPB-congenital disorders of glycosylation associate with decreased enzymatic activity of GMPPB

Zhe Liu, Yan Wang, Fan Yang, Qin Yang, Xianming Mo, Ezra Burstein, Da Jia, Xiao tang Cai, Yingfeng Tu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The congenital disorders of glycosylation (CDG) are a family of metabolic diseases in which glycosylation of proteins or lipids is deficient. GDP-mannose pyrophosphorylase B (GMPPB) mutations lead to CDG, characterized by neurological and muscular defects. However, the genotype-phenotype correlation remains elusive, limiting our understanding of the underlying mechanism and development of therapeutic strategy. Here, we report a case of an individual presenting congenital muscular dystrophy with cerebellar involvement, who presents two heterozygous GMPPB mutations (V111G and G214S). The V111G mutation significantly decreases GMPPB’s enzymatic activity. By measuring enzymatic activities of 17 reported GMPPB mutants identified in patients diagnosed with GMPPB-CDG, we discover that all tested GMPPB variants exhibit significantly decreased enzymatic activity. Using a zebrafish model, we find that Gmppb is required for neuronal and muscle development, and further demonstrate that enzymatic activity of GMPPB mutants correlates with muscular and neuronal phenotypes in zebrafish. Taken together, our findings discover the importance of GMPPB enzymatic activity for the pathogenesis of GMPPB-CDG, and shed light for the development of additional indicators and therapeutic strategy.

Original languageEnglish (US)
Article number13
JournalMolecular Biomedicine
Volume2
Issue number1
DOIs
StatePublished - Dec 2021

Keywords

  • Congenital disorders of glycosylation
  • Enzymatic activity
  • GMPPB
  • Zebrafish model

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology

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