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functional profiling and structural characterisation of the human A316T variant. | LitMetric

AI Article Synopsis

Article Abstract

Glucagon-like peptide-1 receptor (GLP-1R) agonists (GLP-1RAs) are a highly effective therapy class for type 2 diabetes (T2D) and obesity, yet there are variable patient responses. Variation in the human gene leading to altered receptor structure, signal transduction, and function might be directly linked to variable therapeutic responses in patients. A naturally occurring, low-frequency, gain-of-function missense variant, rs10305492 G>A (A316T), protects against T2D and cardiovascular disease. Here we employ CRISPR/Cas9 technology to generate a humanised knock-in mouse model bearing the homozygous A316T substitution. Human mice displayed lower fasting blood glucose levels and improved glucose tolerance, as well as increased plasma insulin levels and improved insulin secretion compared to human littermates, even under metabolic stress. They also exhibited alterations in islet cytoarchitecture and β-cell identity under a high-fat, high-sucrose (HFHS) diet. This was however associated with blunted responses to pharmacological GLP-1RAs . Further investigations in several rodent and human β-cell models demonstrated that the human A316T variant exhibits characteristics of constitutive activation but dampened GLP-1RA responses. Our results are further supported by the cryo-EM analysis and molecular dynamics (MD) simulations of the GLP-1R A316T structure, collectively demonstrating that the A316T variant governs basal receptor activity and pharmacological responses to GLP-1R-targeting anti-diabetic therapies, highlighting the importance of the molecular characterisation of human variants to predict individual therapy responses.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11527029PMC
http://dx.doi.org/10.1101/2024.10.19.619191DOI Listing

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