| First Author | Emfinger CH | Year | 2023 |
| Journal | Elife | Volume | 12 |
| PubMed ID | 37787501 | Mgi Jnum | J:344213 |
| Mgi Id | MGI:7572656 | Doi | 10.7554/eLife.88189 |
| Citation | Emfinger CH, et al. (2023) Novel regulators of islet function identified from genetic variation in mouse islet Ca(2+) oscillations. Elife 12 |
| abstractText | Insufficient insulin secretion to meet metabolic demand results in diabetes. The intracellular flux of Ca(2+) into beta-cells triggers insulin release. Since genetics strongly influences variation in islet secretory responses, we surveyed islet Ca(2+) dynamics in eight genetically diverse mouse strains. We found high strain variation in response to four conditions: (1) 8 mM glucose; (2) 8 mM glucose plus amino acids; (3) 8 mM glucose, amino acids, plus 10 nM glucose-dependent insulinotropic polypeptide (GIP); and (4) 2 mM glucose. These stimuli interrogate beta-cell function, alpha- to beta-cell signaling, and incretin responses. We then correlated components of the Ca(2+) waveforms to islet protein abundances in the same strains used for the Ca(2+) measurements. To focus on proteins relevant to human islet function, we identified human orthologues of correlated mouse proteins that are proximal to glycemic-associated single-nucleotide polymorphisms in human genome-wide association studies. Several orthologues have previously been shown to regulate insulin secretion (e.g. ABCC8, PCSK1, and GCK), supporting our mouse-to-human integration as a discovery platform. By integrating these data, we nominate novel regulators of islet Ca(2+) oscillations and insulin secretion with potential relevance for human islet function. We also provide a resource for identifying appropriate mouse strains in which to study these regulators. |
