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Cell fate specification during respiratory development requires ARID1A-containing canonical BAF complex activity.

Hyunwook Lee1,2,3,4,5, Abigail Jaquish6,7, Sharlene Fernandes1,2

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The BAF complex, crucial for lung development, is essential for proper airway and alveolar cell formation. Its absence, particularly ARID1A, disrupts lung patterning and cell differentiation, impacting lung organogenesis.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Cell Biology

Background:

  • Mammalian lung development involves complex processes like branching morphogenesis and cell lineage specification.
  • Transcriptional and signaling regulators are known, but epigenetic control remains less understood.
  • The BAF complex, an ATP-dependent chromatin remodeler, is investigated for its role in lung epithelial development.

Purpose of the Study:

  • To investigate the role of the canonical BAF complex in mammalian lung epithelial development.
  • To identify the specific functions of the BAF complex and its subunit ARID1A in lung formation and patterning.
  • To explore the impact of BAF complex dysfunction on cell fate acquisition and signaling pathways.

Main Methods:

  • Genetic manipulation to delete BAF complex activity or ARID1A in the developing lung.
  • Analysis of lung morphology, cell type specification, and gene expression patterns.
  • Utilizing embryonic lung organoids to test rescue strategies for differentiation defects.

Main Results:

  • Complete loss of lung formation upon global BAF complex deletion.
  • ARID1A deletion caused failure in proximal-distal axis specification and AT1 cell differentiation.
  • Dysfunctional BAF complex led to YAP/WNT activation, BMP signaling loss, and impaired epithelial differentiation.
  • BMP4 signaling could rescue AT1/AT2 differentiation, but WNT/YAP signaling required functional BAF.

Conclusions:

  • The BAF complex is essential for lung formation, proximal-distal patterning, and cell fate acquisition.
  • ARID1A is critical for establishing lung axis and alveolar cell specification.
  • BAF complex activity differentially regulates signaling pathways (BMP, WNT, YAP) during lung development.