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Control of epithelial tissue organization by mRNA localization
Devon E Mason1, Thomas D Madsen2, Alexander N Gasparski2
1Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer, Institute, NIH, Bethesda, MD, USA. devon.mason@nih.gov.
Nature Communications
|June 5, 2025
Summary
Net1 mRNA localization at the dermal-epidermal junction is crucial for epithelial tissue homeostasis. Disrupting this mRNA targeting affects tissue structure and keratinocyte connections, revealing new insights into post-transcriptional regulation.
Area of Science:
- Cell Biology
- Developmental Biology
- Molecular Biology
Background:
- mRNA localization to subcellular regions is vital in mammalian cells but its physiological roles remain unclear.
- The dermal-epidermal junction (DEJ) is a critical interface in stratified squamous epithelia, maintaining tissue integrity.
Purpose of the Study:
- To investigate the functional significance of Net1 mRNA localization at the DEJ.
- To elucidate the role of Net1 mRNA targeting in epithelial tissue organization and homeostasis.
Main Methods:
- In vivo studies using mouse models to analyze Net1 mRNA localization.
- Investigating the impact of disrupted Net1 mRNA localization on DEJ morphology and keratinocyte-matrix interactions.
- Assessing the downstream effects on Net1 protein accumulation, RhoA activity, and tissue ultrastructure.
Main Results:
- Net1 mRNA was found to be prominently localized at the DEJ, accumulating in protrusion-like structures.
- Disruption of Net1 mRNA localization altered DEJ morphology and keratinocyte-matrix connections, impacting tissue homeostasis.
- Subcellular localization of Net1 mRNA dictated Net1 protein accumulation and its function as a RhoA GTPase exchange factor (GEF), influencing DEJ ultrastructure.
Conclusions:
- Subcellular mRNA localization is a critical regulatory mechanism influencing mammalian epithelial tissue organization.
- Net1 mRNA's precise localization at the DEJ is essential for maintaining tissue homeostasis and proper DEJ ultrastructure.
- This study highlights an unappreciated level of post-transcriptional regulation controlling tissue physiology.
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