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This study on PMM2-Congenital Disorder of Glycosylation (PMM2-CDG) identified new variants and linked specific PMM2 gene mutations to disease severity and biochemical changes, improving genotype/phenotype understanding.

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Area of Science:

  • Biochemistry
  • Genetics
  • Clinical Medicine

Background:

  • PMM2-Congenital Disorder of Glycosylation (PMM2-CDG) is a rare genetic disorder.
  • Understanding genotype/phenotype correlations is crucial for PMM2-CDG management.

Purpose of the Study:

  • To analyze the largest dataset of PMM2-CDG patients.
  • To identify novel PMM2 variants.
  • To investigate genotype/phenotype and genotype/biochemical parameter correlations.

Main Methods:

  • Collected genetic, clinical, and biochemical data from 137 PMM2-CDG patients.
  • Classified PMM2 variants by predicted pathogenetic mechanism.
  • Utilized Nijmegen Progression CDG Rating Scale (NPCRS) and biochemical assays.

Main Results:

  • Identified 60 unique PMM2 variants, including six novel ones.
  • Common variants include p.Arg141His, p.Pro113Leu, and p.Phe119Leu.
  • Dysregulated coagulation factors (antithrombin, Factor XI, protein C) were consistently observed.
  • Genotype/phenotype correlations revealed milder disease with p.Cys241Ser and severe disease with p.Val231Met, dimerization, and folding variants.

Conclusions:

  • This study provides new insights into PMM2-CDG genetics and disease mechanisms.
  • Larger sample size and inclusion of biochemical data enhance genotype/phenotype correlation understanding.
  • Findings contribute to a better understanding of PMM2-CDG heterogeneity.