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Adipocytes arise from multiple lineages that are heterogeneously and dynamically distributed.

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Myf5 precursors are key contributors to white and brite adipocyte populations, not just brown. Adipocyte lineages show plasticity, with insulin receptor signaling crucial for fat cell development.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Metabolic Research

Background:

  • Adipose tissue development and adipocyte origins remain incompletely understood.
  • Identifying precursor populations for different fat types is critical for metabolic health.

Purpose of the Study:

  • To elucidate the cellular origins and developmental pathways of adipocytes.
  • To investigate the role of specific transcription factor lineages (Myf5, Pax3, MyoD1) in adipose tissue formation.
  • To determine the necessity of insulin receptor signaling in adipogenesis.

Main Methods:

  • Utilized a novel lineage-tracing strategy optimized for adipocyte identification.
  • Examined Myf5, Pax3, and MyoD1 lineages during adipose tissue development.
  • Performed in vivo genetic deletion of insulin receptor beta within the Myf5 lineage.

Main Results:

  • Myf5 precursors contribute significantly to mature white and brite adipocytes, challenging exclusive brown adipocyte origins.
  • Myf5 lineage distribution varies with influencing factors and shows plasticity.
  • Pax3 lineage overlaps with Myf5 but exhibits sexual dimorphism in visceral fat; MyoD1 lineage does not produce adipocytes.
  • Insulin receptor beta deletion in Myf5 lineage impairs adipogenesis, confirming its essential role.

Conclusions:

  • Established a conceptual framework for adipose tissue development.
  • Demonstrated plasticity within adipocyte lineages and the critical role of insulin signaling.
  • Provided insights into variations in body fat distribution relevant to obesity and lipodystrophy.