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Transgenic Rescue of the LARGEmyd Mouse: A LARGE Therapeutic Window?

Hildyard, J C W; Lacey, E; Booler, H; Hopkinson, M; Wells, D J; Brown, S C

Authors

J C W Hildyard

E Lacey

H Booler

M Hopkinson

D J Wells

S C Brown



Abstract

LARGE is a glycosyltransferase involved in glycosylation of α-dystroglycan (α-DG). Absence of this protein in the LARGEmyd mouse results in α-DG hypoglycosylation, and is associated with central nervous system abnormalities and progressive muscular dystrophy. Up-regulation of LARGE has previously been proposed as a therapy for the secondary dystroglycanopathies: overexpression in cells compensates for defects in multiple dystroglycanopathy genes. Counterintuitively, LARGE overexpression in an FKRP-deficient mouse exacerbates pathology, suggesting that modulation of α-DG glycosylation requires further investigation. Here we demonstrate that transgenic expression of human LARGE (LARGE-LV5) in the LARGEmyd mouse restores α-DG glycosylation (with marked hyperglycosylation in muscle) and that this corrects both the muscle pathology and brain architecture. By quantitative analyses of LARGE transcripts we also here show that levels of transgenic and endogenous LARGE in the brains of transgenic animals are comparable, but that the transgene is markedly overexpressed in heart and particularly skeletal muscle (20–100 fold over endogenous). Our data suggest LARGE overexpression may only be deleterious under a forced regenerative context, such as that resulting from a reduction in FKRP: in the absence of such a defect we show that systemic expression of LARGE can indeed act therapeutically, and that even dramatic LARGE overexpression is well-tolerated in heart and skeletal muscle. Moreover, correction of LARGEmyd brain pathology with only moderate, near-physiological LARGE expression suggests a generous therapeutic window.

Citation

Hildyard, J. C. W., Lacey, E., Booler, H., Hopkinson, M., Wells, D. J., & Brown, S. C. (2016). Transgenic Rescue of the LARGEmyd Mouse: A LARGE Therapeutic Window?. PLoS ONE, 11(7), e0159853. https://doi.org/10.1371/journal.pone.0159853

Journal Article Type Article
Acceptance Date Jul 8, 2016
Publication Date Jul 28, 2016
Deposit Date Aug 6, 2016
Publicly Available Date Nov 21, 2020
Journal PLoS One
Publisher Public Library of Science
Peer Reviewed Peer Reviewed
Volume 11
Issue 7
Pages e0159853
DOI https://doi.org/10.1371/journal.pone.0159853
Public URL https://rvc-repository.worktribe.com/output/1396027

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