AI Article Synopsis
- Craniofacial defects, particularly hypotelorism (narrowing of the midface), are common issues related to ciliopathies, but their causes are not well understood.
- Research using various mouse models of human ciliopathies has shown that mutations can lead to reduced activation of the Hedgehog (HH) signaling pathway, crucial for facial development, starting from early embryonic stages.
- Enhancing HH signaling by modifying a negative regulator in these models improved cell survival and corrected midface defects, highlighting the importance of ciliary HH signaling in communication during facial development.
Article Abstract
Craniofacial defects are among the most common phenotypes caused by ciliopathies, yet the developmental and molecular etiology of these defects is poorly understood. We investigated multiple mouse models of human ciliopathies (including and mutants) and discovered that each displays hypotelorism, a narrowing of the midface. As early in development as the end of gastrulation, mutants displayed reduced activation of the Hedgehog (HH) pathway in the prechordal plate, the head organizer. This prechordal plate defect preceded a reduction of HH pathway activation and expression in the adjacent neurectoderm. Concomitant with the reduction of HH pathway activity, mutants exhibited increased cell death in the neurectoderm and facial ectoderm, culminating in a collapse of the facial midline. Enhancing HH signaling by decreasing the gene dosage of a negative regulator of the pathway, , decreased cell death and rescued the midface defect in both and mutants. These results reveal that ciliary HH signaling mediates communication between the prechordal plate and the neurectoderm to provide cellular survival cues essential for development of the facial midline.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8592574 | PMC |
| http://dx.doi.org/10.7554/eLife.68558 | DOI Listing |
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