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The transcription factor ISL1 is crucial for pancreatic endocrine cell maturation and function. Loss of ISL1 leads to immature beta cells and impaired alpha cells, contributing to diabetes development.

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Pancreatic islet cells develop from progenitor pools via regulated transcriptional and epigenetic processes.
  • The transcription factor ISL1 (ISL LIM homeodomain) is vital for islet development, but its precise molecular functions are unclear.
  • ISL1 is implicated in diabetes susceptibility, yet its role in pancreatic endocrine maturation remains unresolved.

Purpose of the Study:

  • To elucidate the molecular functions of ISL1 in maintaining pancreatic endocrine cell identity and terminal differentiation.
  • To investigate the transcriptional and epigenetic consequences of ISL1 loss in pancreatic endocrine precursors.
  • To understand how ISL1 dysregulation contributes to diabetes pathogenesis.

Main Methods:

  • Conditional deletion of Isl1 in mouse endocrine precursors.
  • Single-cell RNA sequencing (scRNA-seq) for transcriptional profiling.
  • Chromatin profiling (H3K27ac and H3K27me3) to assess epigenetic landscapes.
  • Longitudinal single-cell analysis of Isl1-deficient islets.

Main Results:

  • Loss of ISL1 disrupts the epigenetic and transcriptional landscape of islets.
  • ISL1 deficiency results in failure of alpha-cell identity, loss of delta and gamma cells, and immature beta cells with impaired function.
  • Isl1-deficient cells exhibit sustained progenitor-like states, defective beta-cell maturation, and activation of stress/diabetes-associated pathways.
  • Distinct sex-specific responses were observed in Isl1-deficient mice.

Conclusions:

  • ISL1 is essential for preserving endocrine cell fate, promoting lineage commitment, and enabling terminal differentiation.
  • ISL1 acts as a transcriptional repressor, facilitating chromatin remodeling for mature endocrine cell function.
  • ISL1 dysregulation contributes to diabetes by disrupting islet cell maturation and function, with potential sex-specific influences on disease progression.