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Béatrice Frenette1, Josselin Guéno1, Nicolas Houde2

  • 1Department of Molecular Biology, Medical Biochemistry & Pathology, Université Laval, Québec, Canada.

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Summary
This summary is machine-generated.

This study identifies HOXA5 targets in developing mouse lungs, revealing its critical role in regulating gene networks essential for lung development and morphogenesis. Understanding these networks is key to addressing respiratory defects.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • The function of Hoxa5 in mouse development is known, but its regulatory networks are not well understood.
  • Hoxa5 is crucial for embryonic lung development, as Hoxa5 knockout mice exhibit respiratory failure at birth.

Purpose of the Study:

  • To identify genome-wide targets of the HOXA5 protein in vivo.
  • To elucidate the regulatory networks controlled by HOXA5 during embryonic lung development.

Main Methods:

  • Generation of a Hoxa5FLAG epitope-tagged mouse line.
  • Chromatin immunoprecipitation sequencing (ChIP-seq) in embryonic lung tissue.
  • Assays including ATAC-seq and in situ hybridization.

Main Results:

  • Defined an in vivo HOXA5 binding motif and its distribution in the embryonic lung genome.
  • Identified HOXA5 targets, including other Hox genes and key lung morphogenesis signaling pathways (FGF10, SHH, BMP4, WNT2).
  • Confirmed the impact of Hoxa5 loss on the expression of identified targets.

Conclusions:

  • HOXA5 plays a crucial role in the coordinated control of signaling networks that direct lung development.
  • This study provides a genome-wide view of HOXA5 occupancy and its targets in the embryonic lung.