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FKRP-dependent glycosylation of fibronectin regulates muscle pathology in muscular dystrophy

  • A. J. Wood
  • , C. H. Lin
  • , M. Li
  • , K. Nishtala
  • , S. Alaei
  • , F. Rossello
  • , C. Sonntag
  • , L. Hersey
  • , L. B. Miles
  • , C. Krisp
  • , S. Dudczig
  • , A. J. Fulcher
  • , S. Gibertini
  • , P. J. Conroy
  • , A. Siegel
  • , M. Mora
  • , P. Jusuf
  • , N. H. Packer
  • , P. D. Currie

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The muscular dystrophies encompass a broad range of pathologies with varied clinical outcomes. In the case of patients carrying defects in fukutin-related protein (FKRP), these diverse pathologies arise from mutations within the same gene. This is surprising as FKRP is a glycosyltransferase, whose only identified function is to transfer ribitol-5-phosphate to α-dystroglycan (α-DG). Although this modification is critical for extracellular matrix attachment, α-DG’s glycosylation status relates poorly to disease severity, suggesting the existence of unidentified FKRP targets. Here we reveal that FKRP directs sialylation of fibronectin, a process essential for collagen recruitment to the muscle basement membrane. Thus, our results reveal that FKRP simultaneously regulates the two major muscle-ECM linkages essential for fibre survival, and establishes a new disease axis for the muscular dystrophies.

Original languageEnglish
Article number2951
Number of pages12
JournalNature Communications
Volume12
Issue number1
DOIs
Publication statusPublished - Dec 2021

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