Related Experiment Video
Updated: Jun 3, 2026
13:00
Studying Wnt Signaling During Patterning of Conducting Airways
Published on: October 16, 2016
Foxn4 influences alveologenesis during lung development.
1Center for Advanced Biotechnology and Medicine and Department of Pediatrics, UMDNJ-Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA.
Summary
Foxn4 is a transcription factor crucial for lung development. Its inactivation leads to abnormal alveoli formation, suggesting a key role in lung maturation.
Area of Science:
- Developmental biology
- Molecular biology
- Genetics
Background:
- Lung development involves complex processes like alveologenesis.
- Epithelial and mesenchymal cell interactions are vital for lung formation.
- Transcription factors play critical roles in regulating developmental pathways.
Purpose of the Study:
- To investigate the role of the Foxn4 transcription factor in murine lung development.
- To understand the cellular localization and function of Foxn4 during lung maturation.
Main Methods:
- Murine lung development model.
- Targeted inactivation of the Foxn4 gene.
- Analysis of lung morphology and gene expression.
Main Results:
- Foxn4 is expressed in a specific subpopulation of postmitotic epithelial cells in the proximal airways.
- Foxn4 inactivation results in dilated alveoli, thinned alveolar walls, and reduced septa in the distal lung.
- Alveolar defects correlate with decreased platelet-derived growth factor-A (PDGFA) signaling and reduced surfactant protein B (SFTPB) expression.
Conclusions:
- Foxn4 plays a critical, potentially non-cell-autonomous, role in alveologenesis.
- Foxn4 influences key signaling pathways and gene expression essential for proper lung development.
Related Concept Videos
01:26Alveoli and Alveolar Ducts
The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...
01:24Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
02:32Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
01:51Determination
During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...