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Understanding pathophysiology of GNE myopathy and current progress towards drug development

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Abstract

GNE myopathy is a rare genetic neuromuscular disease that is caused due to mutations in the GNE gene responsible for sialic acid biosynthesis. Foot drop is the most common initial symptom observed in GNE myopathy patients. There is slow progressive muscle weakness in the lower and upper extremities while the quadriceps muscles are usually spared. The exact pathophysiology of the disease is unknown. Besides sialic acid biosynthesis, recent studies suggest either direct or indirect involvement of GNE in other cellular functions such as protein aggregation, apoptosis, ER stress, cell migration, HSP70 chaperone activity, autophagy, muscle atrophy, and myogenesis. Both animal and in vitro cell-based model systems are generated to elucidate the mechanism of GNE myopathy and evaluate the efficacy of therapies. The many therapeutic avenues explored include supplementation with sialic acid derivatives or precursors and gene therapy. Recent studies suggest other therapeutic options such as modulators of HSP70 chaperone (BGP-15), cofilin activator (CGA), and ligands like IGF-1 that may help to rescue cellular defects due to GNE dysfunction. This review provides an overview of the pathophysiology associated with GNE function in the cell and promising therapeutic leads to be explored for future drug development.

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Acknowledgements

The authors acknowledge the guidance and technical advice from Prof. Alok Bhattacharya and Prof. Sudha Bhattacharya, Ashoka University, Sonepat, Haryana.

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  1. School of Biotechnology, Jawaharlal Nehru University, New Delhi, 110067, India

    Fluencephila Mashangva, Shagun Singh, Jyoti Oswalia & Ranjana Arya

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This article is part of the Topical Collection: The Rare Genetic Disease Research Landscape in India.

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Mashangva, F., Singh, S., Oswalia, J. et al. Understanding pathophysiology of GNE myopathy and current progress towards drug development. J Biosci 49, 29 (2024). https://doi.org/10.1007/s12038-023-00414-7

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