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Regulatory factor X-box binding 6 (RFX6) is crucial for human alpha-cell function. Suppressing RFX6 impairs glucagon secretion and hormone release, highlighting its role in diabetes.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Mutations in the regulatory factor X-box binding 6 (RFX6) gene are linked to human diabetes.
  • RFX6 is highly expressed in pancreatic islet alpha-cells, with altered expression in diabetes.
  • The specific functions of RFX6 in human adult alpha-cells remain largely unknown.

Purpose of the Study:

  • To investigate the role of RFX6 in regulating gene expression and function of human adult alpha-cells.
  • To identify RFX6-dependent genes and mechanisms in alpha-cells.
  • To assess the impact of RFX6 on glucagon secretion and exocytosis.

Main Methods:

  • Developed a method for selective genetic targeting of human alpha-cells.
  • Utilized RNA interference (RNAi) to suppress RFX6 expression in alpha-cells.
  • Performed transcriptomics and mapped RFX6 DNA-binding sites in primary human islet cells.

Main Results:

  • RFX6 suppression in alpha-cells impaired exocytosis and dysregulated glucagon secretion in vitro and in vivo.
  • These effects were specific to alpha-cells; RFX6 suppression in all islet cells did not yield similar phenotypes.
  • Transcriptomics identified RFX6-dependent genes involved in nutrient sensing, hormone processing, and secretion, some exclusive to human alpha-cells.

Conclusions:

  • RFX6 is essential for regulating adult human alpha-cell function, including hormone secretion.
  • RFX6 directly regulates specific genes critical for alpha-cell physiology.
  • Understanding RFX6's role provides insights into diabetes pathogenesis and potential therapeutic targets.