GO:0060683 regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling: Epithelial-Mesenchymal Crosstalk, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0060683 describes how signals sent from salivary gland epithelial cells to surrounding mesenchymal cells modulate the rate, frequency, or extent of salivary gland branching.
• Branching morphogenesis of the salivary gland is a classic model of epithelial-mesenchymal interaction, in which the epithelium forms clefts and buds while the mesenchyme provides instructive and permissive signals.
• Key signaling families implicated in salivary gland branching include FGFs (notably FGF8 subfamily members), activins, and integrin-mediated adhesion, all of which can influence epithelial-mesenchymal communication.
• Disruption of epithelial-mesenchymal signaling pathways such as TBX-FGF is linked to severe developmental disorders, underscoring the clinical relevance of this process.
• BTBD7, a gene associated with branching morphogenesis, is expressed in salivary adenoid cystic carcinoma and correlates with Slug and prognosis, suggesting a role in tumor biology.
• Researchers study GO:0060683 using organ culture, mesenchymal-free epithelial cultures, gene knockout/knock-in models, and CRISPR-based screens to dissect signaling mechanisms.
Description
Salivary gland branching morphogenesis is a fundamental developmental process that generates the complex ductal tree of the salivary gland. GO:0060683, regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling, captures a specific regulatory axis: signals emanating from the epithelial cells that act on the adjacent mesenchyme to control branching. This term is essential for understanding how tissue architecture is established through reciprocal tissue interactions. The process is highly conserved and serves as a paradigm for epithelial-mesenchymal crosstalk in organogenesis. Researchers in developmental biology, regenerative medicine, and cancer biology study this term because defects in branching signaling can lead to congenital anomalies and because similar pathways are reactivated in tumors such as salivary adenoid cystic carcinoma. The QuickGO definition emphasizes that the process modulates the rate, frequency, or extent of branching as a result of information transfer from epithelium to mesenchyme, distinguishing it from other branching regulatory mechanisms. Understanding GO:0060683 therefore requires integrating knowledge of secreted factors, extracellular matrix remodeling, and cell-surface receptors that mediate epithelial-mesenchymal communication.
regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling At A Glance
| GO ID | GO:0060683 |
|---|---|
| GO term | regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling |
| Ontology | biological_process |
| Synonym | regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signalling |
| Major function | Modulates the rate, frequency, or extent of salivary gland branching via epithelial-to-mesenchymal signal transfer |
| Directionality | Epithelium to mesenchyme |
| Process context | Salivary gland branching morphogenesis |
| Related processes | FGF signaling, activin signaling, integrin-mediated adhesion, extracellular matrix remodeling |
What Is GO:0060683?
GO:0060683 is a biological process term defined as any process that modulates the rate, frequency, or extent of salivary gland branching as a result of the transfer of information from the epithelial cells to the mesenchymal cells of the salivary gland. In simpler terms, it describes how the inner epithelial layer of the developing salivary gland sends signals to the surrounding mesenchymal tissue to control how much and how fast the gland branches. This is a directional signaling term: the information flows from epithelium to mesenchyme, and the outcome is regulation of branching morphogenesis. It is distinct from terms that describe branching itself or signaling in the opposite direction.
Why Is regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling Important in Cell Biology?
GO:0060683 is important because it defines a critical regulatory node in salivary gland development, where epithelial-derived signals instruct the mesenchyme to shape the branching pattern of the gland. This process is essential for normal organ function, and its disruption is associated with developmental defects and diseases such as salivary gland tumors and lung developmental disorders linked to TBX-FGF pathway disruption. Understanding this term helps researchers identify the molecular players that mediate epithelial-mesenchymal communication, providing targets for regenerative medicine and cancer therapy.
• Defines a key epithelial-mesenchymal signaling axis that controls salivary gland branching morphogenesis.
• Involves FGF8 subfamily members, which are critical for embryogenesis and oral-maxillofacial development.
• Activins act as regulators of branching morphogenesis, highlighting the role of TGF-beta superfamily signals in this process.
• Integrin alpha 6 subunit is required for branching morphogenesis in fetal mouse submandibular gland, linking adhesion to epithelial-mesenchymal signaling.
• BTBD7 expression in salivary adenoid cystic carcinoma correlates with Slug and prognosis, suggesting a role in tumor progression.
• Disruption of TBX-FGF pathway causes lethal lung developmental disorders, demonstrating the clinical impact of branching signaling defects.
• Provides a framework for studying how epithelial signals are interpreted by mesenchyme to produce tissue architecture.
• Relevant to regenerative approaches aiming to restore salivary gland function after damage or disease.
• Serves as a model for understanding similar epithelial-mesenchymal interactions in other branching organs such as lung and kidney.
• Offers potential therapeutic targets for conditions involving aberrant branching, including cancer and developmental anomalies.
What Happens During regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling?
Initiation of epithelial signaling
In simple terms: The inner layer of the developing salivary gland starts sending out molecular messages.
During early salivary gland development, the epithelial bud invades the surrounding mesenchyme and begins to produce signaling molecules. These epithelial-derived signals are the first step in GO:0060683, as they carry information from the epithelium to the mesenchyme. Key signals include FGFs, which are known to regulate branching morphogenesis in multiple organs. The epithelial cells also interact with the extracellular matrix through integrins, which can modulate signaling output.
Signal reception by mesenchymal cells
In simple terms: The outer supporting tissue receives the messages and gets ready to respond.
Mesenchymal cells surrounding the salivary gland epithelium express receptors that bind epithelial-derived factors. For example, FGF8 subfamily members signal through FGFRs on mesenchymal cells to influence their behavior. Activins, which are TGF-beta superfamily ligands, can also act on mesenchymal cells to regulate branching. This reception step is essential for translating epithelial signals into mesenchymal responses that modulate branching.
Modulation of branching rate and pattern
In simple terms: The messages change how fast and in what pattern the gland branches.
Once mesenchymal cells receive epithelial signals, they alter their production of extracellular matrix components, growth factors, and other molecules that feed back to the epithelium to control branching. This regulation determines the rate, frequency, and extent of branching, as defined by GO:0060683. The interplay between FGF signaling and other pathways such as activin and integrin-mediated adhesion fine-tunes the branching pattern.
Feedback and coordination with other pathways
In simple terms: The conversation between the two tissues continues, with more signals going back and forth.
Epithelial-mesenchymal signaling is bidirectional, but GO:0060683 specifically covers the epithelial-to-mesenchymal direction. This signaling is coordinated with other pathways, including TBX-FGF, which is critical for lung and salivary gland development. Disruption of these coordinated signals can lead to abnormal branching and disease, as seen in salivary adenoid cystic carcinoma where BTBD7 expression correlates with prognosis.
Key Genes Involved in GO:0060683 regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling
The following genes and proteins are experimentally implicated in epithelial-mesenchymal signaling that regulates salivary gland branching morphogenesis.
| Gene | Major Role | Research Relevance |
|---|---|---|
| FGF8 | Epithelial-derived FGF ligand that signals to mesenchyme | Regulates branching in salivary gland and other organs; linked to oral-maxillofacial diseases |
| FGFR2 | Receptor for FGFs on mesenchymal cells | Mediates FGF signaling during branching morphogenesis |
| ACTIVIN A | TGF-beta superfamily ligand that regulates branching | Modulates branching morphogenesis in salivary gland and other tissues |
| ITGA6 | Integrin alpha 6 subunit, mediates cell-matrix adhesion | Required for branching morphogenesis in fetal mouse submandibular gland |
| BTBD7 | BTB/POZ domain-containing protein, involved in branching | Expressed in salivary adenoid cystic carcinoma; correlates with Slug and prognosis |
| SLUG (SNAI2) | Transcription factor involved in EMT | Correlates with BTBD7 in salivary adenoid cystic carcinoma |
| TBX2 | Transcription factor in TBX-FGF pathway | Disruption causes lethal lung developmental disorders |
| TBX4 | Transcription factor in TBX-FGF pathway | Disruption causes lethal lung developmental disorders |
| FGF10 | Mesenchymal FGF ligand | Involved in branching morphogenesis of multiple organs |
| SHH | Sonic hedgehog signaling molecule | Regulates branching in salivary gland and other organs |
| EGF | Epidermal growth factor | Modulates branching morphogenesis |
| TGFB1 | Transforming growth factor beta 1 | Regulates epithelial-mesenchymal interactions |
| MMP2 | Matrix metalloproteinase 2 | Remodels extracellular matrix during branching |
| MMP9 | Matrix metalloproteinase 9 | Remodels extracellular matrix during branching |
| LAMA5 | Laminin subunit alpha 5 | Component of basement membrane affecting branching |
| COL4A1 | Collagen type IV alpha 1 | Extracellular matrix component in salivary gland |
| ITGB1 | Integrin beta 1 | Mediates cell-matrix adhesion during branching |
How Is regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling Regulated?
The process described by GO:0060683 is regulated by a network of signaling pathways. FGF signaling, particularly through FGF8 subfamily members, is a key regulator of branching morphogenesis and is modulated by feedback mechanisms involving Sprouty proteins and other antagonists. Activins, members of the TGF-beta superfamily, can either promote or inhibit branching depending on context, and their activity is controlled by inhibitors such as follistatin. Integrin-mediated adhesion to the extracellular matrix provides mechanical and biochemical cues that modulate epithelial-mesenchymal signaling. Additionally, transcription factors such as TBX2 and TBX4 regulate the expression of FGF pathway components, and their disruption leads to severe developmental defects. The BTBD7-Slug axis has been implicated in salivary adenoid cystic carcinoma, suggesting that branching regulatory pathways can be dysregulated in cancer.
regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BTBD7 | Salivary adenoid cystic carcinoma; correlates with Slug and prognosis | Knockout or overexpression in salivary gland cancer cell lines; xenograft models |
| TBX2/TBX4 | Lethal lung developmental disorders due to TBX-FGF pathway disruption | Knockout mouse models; lung organoids |
| FGF8 | Oral-maxillofacial diseases; branching morphogenesis defects | Conditional knockout mice; salivary gland organ culture |
| ITGA6 | Branching morphogenesis defects in submandibular gland | Mesenchyme-free epithelial culture; knockout mice |
| ACTIVIN A | Aberrant branching in salivary gland and other organs | Transgenic overexpression; organ culture |
Salivary adenoid cystic carcinoma
Salivary adenoid cystic carcinoma is a malignant tumor of the salivary glands that often exhibits aberrant branching-like structures. BTBD7, a gene involved in branching morphogenesis, is expressed in primary salivary adenoid cystic carcinoma, and its expression correlates with Slug and prognosis, suggesting that pathways related to GO:0060683 may contribute to tumor progression.
Lung developmental disorders
Disruption of the TBX-FGF pathway, which is critical for branching morphogenesis in multiple organs including the lung, causes lethal lung developmental disorders. This highlights the broader importance of epithelial-mesenchymal signaling mechanisms akin to GO:0060683 in human congenital disease.
Oral-maxillofacial diseases
FGF8 subfamily members play roles in embryogenesis and oral-maxillofacial diseases, including cleft palate and other craniofacial anomalies. Since FGF signaling is a key component of epithelial-mesenchymal signaling in salivary gland branching, dysregulation of this pathway may contribute to these conditions.
From regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate epithelial-mesenchymal signaling in salivary gland branching? | Knockout mouse or CRISPR KO in salivary gland organ culture |
| Does a specific point mutation in gene X alter branching? | Point-mutation knock-in via CRISPR in mice or cell lines |
| Does overexpression of gene X enhance or inhibit branching? | Transgenic overexpression or CRISPR activation in salivary gland epithelium |
| Where is gene X expressed during branching? | Tagged knock-in (e.g., GFP) reporter mouse |
| What is the role of gene X in salivary adenoid cystic carcinoma? | CRISPR KO or overexpression in adenoid cystic carcinoma cell lines |
| How does gene X interact with FGF signaling? | Epithelial-mesenchymal co-culture with FGF inhibitors |
How to Study the regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Organ culture with time-lapse imaging | Branching rate, pattern, and dynamics | Live monitoring of epithelial-mesenchymal signaling |
| Mesenchyme-free epithelial culture | Epithelial autonomous vs. mesenchymal-dependent branching | Testing sufficiency of epithelial signals |
| RNA-seq | Transcriptional changes in epithelium and mesenchyme | Identifying signaling molecules and pathways |
| Spatial transcriptomics | Localization of gene expression in tissue context | Mapping epithelial-mesenchymal crosstalk |
| CRISPR knockout screens | Gene function loss-of-function in branching | Discovery of novel regulators |
| Immunohistochemistry | Protein localization and expression | Validating signaling components in situ |
| Western blot | Protein levels and activation states | Measuring pathway activity (e.g., phospho-ERK) |
| Co-culture assays | Epithelial-mesenchymal interaction | Testing paracrine signaling |
Organ culture and live imaging
Salivary gland organ culture allows real-time observation of branching morphogenesis. Epithelial-mesenchymal signaling can be monitored using fluorescent reporters and time-lapse microscopy. This method is classic for studying GO:0060683.
Mesenchyme-free epithelial culture
In mesenchyme-free epithelial culture systems, the epithelium is separated from the mesenchyme and cultured with defined factors. This approach helps identify which epithelial-derived signals are necessary and sufficient for branching regulation.
Transcriptomics and spatial profiling
RNA-seq of epithelial and mesenchymal compartments at different branching stages can reveal differentially expressed genes and pathways involved in GO:0060683. Spatial transcriptomics can localize signals to specific tissue regions.
CRISPR screens and functional genomics
CRISPR knockout screens in salivary gland epithelial cells or organoids can identify genes that regulate branching when lost. These screens can uncover novel components of epithelial-mesenchymal signaling pathways.
How CRISPR Can Be Used to Study GO:0060683 regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling
Knockout
CRISPR knockout of candidate genes in salivary gland epithelial or mesenchymal cells can determine whether they are required for epithelial-mesenchymal signaling and branching. For example, knocking out FGF8 or ITGA6 in mouse models or organ cultures can reveal their roles in branching morphogenesis.
Point Mutation
Point mutations in genes such as TBX2 or TBX4 can be introduced using CRISPR base editing or homology-directed repair to model human developmental disorders. These models help assess how specific mutations affect epithelial-mesenchymal signaling and branching.
Knock-in
Knock-in of reporter genes (e.g., GFP) or epitope tags into endogenous loci allows visualization and tracking of signaling molecules during branching. This is useful for studying the dynamics of epithelial-mesenchymal signaling in real time.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression can be used to test whether increasing the level of a candidate gene enhances or disrupts branching. Overexpression of activin or FGF8, for instance, can alter branching patterns in organ culture.
How EDITGENE Supports regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling Research
Researchers studying regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling-related genes often need to determine whether a candidate gene is causally involved in the process or merely correlated with it. Functional validation through precise genome editing is essential to establish causality and to dissect the molecular mechanisms underlying GO:0060683.
Contact EDITGENE today to design your custom CRISPR model for regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling research.
Frequently Asked Questions About regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling
What is GO:0060683?
GO:0060683 is a Gene Ontology biological process term defined as any process that modulates the rate, frequency, or extent of salivary gland branching as a result of the transfer of information from the epithelial cells to the mesenchymal cells of the salivary gland.
What genes are involved in regulation of branching involved in salivary gland morphogenesis by epithelial-mesenchymal signaling?
Key genes include FGF8, FGFR2, activin A, ITGA6, BTBD7, TBX2, TBX4, and others involved in FGF, TGF-beta, and integrin signaling.
How does epithelial-mesenchymal signaling regulate salivary gland branching?
Epithelial cells secrete factors such as FGFs that act on mesenchymal cells, which in turn remodel the extracellular matrix and produce feedback signals to control branching rate and pattern.
What diseases are associated with defects in salivary gland branching signaling?
Salivary adenoid cystic carcinoma, lung developmental disorders due to TBX-FGF disruption, and oral-maxillofacial diseases have been linked to dysregulation of these pathways.
What model systems are used to study GO:0060683?
Common models include mouse salivary gland organ culture, mesenchyme-free epithelial culture, CRISPR knockout mice, and organoids.
What is the role of FGF8 in salivary gland branching?
FGF8 subfamily members are epithelial-derived signals that regulate branching morphogenesis and are implicated in oral-maxillofacial diseases.
How do integrins contribute to salivary gland branching?
Integrin alpha 6 subunit is required for branching morphogenesis in fetal mouse submandibular gland, mediating cell-matrix adhesion that modulates signaling.
What is BTBD7 and how is it related to salivary gland tumors?
BTBD7 is a gene involved in branching morphogenesis; its expression in salivary adenoid cystic carcinoma correlates with Slug and prognosis.
Can CRISPR be used to study epithelial-mesenchymal signaling in salivary glands?
Yes, CRISPR knockout, knock-in, point mutation, and overexpression models allow functional dissection of genes involved in this process.
What methods are used to analyze branching morphogenesis?
Organ culture with live imaging, RNA-seq, spatial transcriptomics, and CRISPR screens are commonly used.
Conclusion
GO:0060683 captures a fundamental regulatory mechanism in salivary gland development: the transfer of information from epithelial cells to mesenchymal cells to control branching. This process involves a complex interplay of FGF, activin, integrin, and other signaling pathways, and its dysregulation is linked to cancer and developmental disorders. Understanding the molecular players and their interactions provides opportunities for therapeutic intervention and regenerative medicine. Continued research using advanced CRISPR models and functional genomics will further elucidate the mechanisms underlying this critical developmental process.
References
- 1. Patel VN et al.. 2006. Salivary gland branching morphogenesis.. Differentiation 74(7):349-64 PMID: 16916374
- 2. Hao Y et al.. 2019. Roles of FGF8 subfamily in embryogenesis and oral‑maxillofacial diseases (Review).. Int J Oncol 54(3):797-806 PMID: 30628659
- 3. Ball EM et al.. 2001. Activins as regulators of branching morphogenesis.. Dev Biol 238(1):1-12 PMID: 11783989
- 4. Koyama N et al.. 2009. Role of alpha 6 integrin subunit in branching morphogenesis of fetal mouse submandibular gland: investigation by mesenchyme-free epithelial culture system.. J Med Invest 56 Suppl:247-9 PMID: 20224190
- 5. Yang L et al.. 2016. Expression of BTBD7 in primary salivary adenoid cystic carcinoma and correlation with Slug and prognosis.. Cancer Biomark 17(2):179-85 PMID: 27540976
- 6. Karolak JA et al.. 2019. Complex Compound Inheritance of Lethal Lung Developmental Disorders Due to Disruption of the TBX-FGF Pathway.. Am J Hum Genet 104(2):213-228 PMID: 30639323
