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GNE gene-specific c.2179G&gt;A(p.V727M) is a key alteration reported in patients with hereditary inclusion body myopathy (HIBM) and represents an ethnic founder mutation in the Indian cohort. However, the underlying role of this mutation in pathogenesis remains largely unknown. Thus, in this study, we aimed to access possible mechanisms of V727M mutation that could be leading to myopathy. We evaluated various  in silico  tools to predict the effect of this mutation on pathogenicity, structural or possible interactions, that could induce myopathy. Our results propose that V727M mutation could induce deleterious effects or pathogenicity and affect the stability of GNE protein. Analysis of differential genes reported in the V727 mutant case suggests that it can affect GNE protein interaction with Myc-proto-oncogene (MYC) transcription factor. Our  in silico  analysis also suggests a possible interaction between GNE ManNac-kinase domain with MYC protein at the C-terminal DNA-binding domain. MYC targets reported in skeletal muscles via ChIP-seq suggest that it plays a key role in regulating the expression of many genes reported differentially expressed in V727M-mutated HIBMs. We conclude that V727M mutation could alter the interaction of GNE with MYC thereby altering transcription of sialyltransferase and neuromuscular genes, thus understanding these effects could pave the way for developing effective therapies against HIBM.

Dissecting role of founder mutation p.V727M in GNE in Indian HIBM cohort