GO:0090191 negative regulation of branching involved in ureteric bud morphogenesis: Kidney Development Control, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090191 describes any process that decreases the rate, frequency or extent of branching of the ureteric bud, the embryonic epithelial tube that gives rise to the ureter and kidney collecting system.
• Semaphorin3a (Sema3a) is a well-characterized negative regulator of ureteric bud branching; it inhibits branching morphogenesis in embryonic kidney explants.
• The process is essential for proper nephron endowment; dysregulation can lead to congenital anomalies of the kidney and urinary tract (CAKUT).
• HNF1B, a transcription factor mutated in renal cysts and diabetes syndrome, controls nephron segment identity and interacts with Notch signaling, indirectly influencing ureteric bud branching.
• Epigenetic regulators, including heterochromatin proteins, are emerging as modulators of nephrogenesis and ureteric bud branching.
• Studying GO:0090191 requires combining organ culture, live imaging, transcriptomics, and CRISPR-based gene editing to dissect gene function [1,2,4].
Description
The development of the mammalian kidney depends on reciprocal interactions between the ureteric bud and the metanephric mesenchyme. The ureteric bud is an epithelial tube that emerges from the Wolffian duct, invades the metanephric mesenchyme, and undergoes iterative branching to form the collecting duct system and ureter. The rate and pattern of this branching are tightly controlled by positive and negative signals. GO:0090191, negative regulation of branching involved in ureteric bud morphogenesis, captures the biological processes that restrain or limit this branching, ensuring proper kidney architecture and nephron number. Dysregulation of ureteric bud branching is associated with congenital anomalies of the kidney and urinary tract (CAKUT), including renal hypoplasia and dysplasia. Understanding the negative regulators of branching is therefore critical for uncovering the molecular basis of these disorders. Semaphorin3a (Sema3a) was the first identified secreted inhibitor of ureteric bud branching, acting through neuropilin-1 and plexinA receptors to restrict ectopic branching. Other factors, such as HNF1B, influence branching indirectly by controlling nephron differentiation and Notch signaling. Recent proteomic studies have highlighted epigenetic regulators, such as heterochromatin proteins, as novel players in nephrogenesis, suggesting that negative regulation of branching may also occur at the chromatin level. This article synthesizes current knowledge on GO:0090191, its key genes, regulatory mechanisms, disease relevance, and experimental approaches, providing a resource for researchers studying kidney development and disease.
negative regulation of branching involved in ureteric bud morphogenesis At A Glance
| GO ID | GO:0090191 |
|---|---|
| GO term | negative regulation of branching involved in ureteric bud morphogenesis |
| Ontology | biological_process |
| Synonym | none |
| Major function | Restricts the rate, frequency or extent of ureteric bud branching during kidney development |
| Key negative regulator | Semaphorin3a (Sema3a) |
| Related process | Ureteric bud branching morphogenesis (GO:0001656) |
| Disease relevance | Congenital anomalies of the kidney and urinary tract (CAKUT) |
| Experimental models | Embryonic kidney organ culture, genetic mouse models, CRISPR-edited cell lines [1,4] |
What Is GO:0090191?
GO:0090191 is defined as any process that decreases the rate, frequency or extent of branching involved in ureteric bud morphogenesis. The ureteric bud is an epithelial tube that grows out from the metanephric duct; it elongates and branches to give rise to the ureter and kidney collecting tubules. Thus, this term encompasses molecular signals, cellular behaviors, and tissue-level interactions that inhibit or limit the branching program during embryonic kidney development.
Why Is negative regulation of branching involved in ureteric bud morphogenesis Important in Cell Biology?
Negative regulation of ureteric bud branching is essential for normal kidney development. Without proper inhibitory signals, excessive or ectopic branching can lead to malformed collecting ducts, reduced nephron endowment, and congenital kidney anomalies. Understanding GO:0090191 provides insights into the molecular mechanisms that balance growth factor signaling during organogenesis and offers potential therapeutic targets for kidney regeneration and disease [1,2].
• Controls nephron number and kidney size by limiting excessive ureteric bud branching.
• Prevents ectopic branching and maintains proper ureteric tree architecture.
• Dysregulation is linked to CAKUT, including renal hypoplasia and dysplasia.
• Sema3a, a key negative regulator, coordinates vascular and epithelial patterning in the developing kidney.
• HNF1B mutations cause renal cysts and diabetes syndrome, partly through disrupted branching and differentiation.
• Epigenetic regulators such as heterochromatin proteins modulate nephrogenesis and may influence branching.
• Provides a model for understanding how negative feedback shapes branched organs (lung, mammary gland, salivary gland).
• Potential target for promoting kidney regeneration by modulating branching in stem cell-derived organoids.
• Helps explain sexual dimorphism and species-specific differences in kidney structure.
• Guides CRISPR-based functional screens to identify novel inhibitors of branching [1,4].
What Happens During negative regulation of branching involved in ureteric bud morphogenesis?
Initiation of the ureteric bud and early branching
In simple terms: The ureteric bud starts as a small bump on the Wolffian duct and begins to branch, forming the first branches of the kidney collecting system.
The ureteric bud emerges from the Wolffian duct and invades the metanephric mesenchyme, where it undergoes dichotomous branching. This process is driven by positive signals such as GDNF and FGF, but negative regulators are already present to ensure controlled outgrowth. Sema3a is expressed in the surrounding mesenchyme and can inhibit ectopic bud formation.
Semaphorin3a-mediated inhibition of branching
In simple terms: Semaphorin3a acts like a stop signal that prevents the ureteric bud from branching too much.
Sema3a is a secreted protein that binds to neuropilin-1 and plexinA receptors on ureteric bud epithelial cells, leading to cytoskeletal changes that inhibit branching. In embryonic kidney explants, exogenous Sema3a reduces the number of ureteric bud branches, while blocking Sema3a increases branching. This demonstrates that Sema3a is a bona fide negative regulator of ureteric bud morphogenesis.
Transcriptional control by HNF1B and Notch signaling
In simple terms: HNF1B is a master regulator that helps decide which parts of the kidney tubule become what, and it interacts with Notch signals to keep branching in check.
HNF1B controls proximal-intermediate nephron segment identity by regulating Notch signaling components and Irx1/2. Although HNF1B primarily acts in the nephron lineage, its disruption leads to altered ureteric bud branching indirectly, as proper nephron differentiation feeds back to regulate branching. Thus, HNF1B is part of a gene network that modulates the extent of branching.
Epigenetic regulation by heterochromatin proteins
In simple terms: Proteins that package DNA can also influence how much the ureteric bud branches by changing which genes are active.
Proteomic analysis of embryonic kidney development identified heterochromatin proteins as epigenetic regulators of nephrogenesis. These proteins may affect the expression of branching inhibitors or promoters, thereby contributing to negative regulation of ureteric bud branching. This highlights a layer of epigenetic control that is only beginning to be understood.
Integration of negative signals to shape the final ureteric tree
In simple terms: Multiple stop signals work together to make sure the kidney's plumbing has the right number of branches.
Negative regulation of branching is not a single pathway but an integration of secreted inhibitors (e.g., Sema3a), transcription factors (e.g., HNF1B), and epigenetic modifiers [1,3,4]. These signals ensure that branching ceases at the appropriate time and that the final ureteric tree matches the needs of the surrounding nephrons. Disruption of this balance leads to structural kidney defects.
Key Genes Involved in GO:0090191 negative regulation of branching involved in ureteric bud morphogenesis
The following genes and proteins have been experimentally implicated in the negative regulation of ureteric bud branching or in related developmental processes that influence this GO term.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Sema3a | Secreted inhibitor of ureteric bud branching; acts via neuropilin-1/plexinA | Direct negative regulator; knockout leads to increased branching |
| HNF1B | Transcription factor controlling nephron segment identity and Notch signaling | Mutations cause renal cysts and diabetes; indirectly affects branching |
| Notch1 | Cell fate signaling component regulated by HNF1B | Modulates branching and differentiation |
| Irx1 | Transcription factor downstream of HNF1B | Influences nephron patterning and branching |
| Irx2 | Transcription factor downstream of HNF1B | Influences nephron patterning and branching |
| Gdnf | Positive regulator of branching; provides context for negative regulation | Essential for ureteric bud outgrowth; balance with inhibitors |
| Ret | Receptor for GDNF; positive signal | Mutations cause CAKUT; interacts with negative regulators |
| Wnt11 | Positive regulator of branching | Modulates ureteric bud elongation |
| Bmp4 | Can inhibit branching in some contexts | Negative regulator in ureteric bud |
| Bmp7 | Promotes branching but may have context-dependent inhibitory roles | Knockout causes renal dysplasia |
| Fgf7 | Promotes branching | May be modulated by negative regulators |
| Fgf10 | Promotes branching | Interacts with negative feedback loops |
| Pax2 | Transcription factor essential for kidney development | Mutations cause renal anomalies; may integrate negative signals |
| Eya1 | Transcription factor required for ureteric bud outgrowth | Mutations cause branchio-oto-renal syndrome |
| Six1 | Co-factor with Eya1 | Mutations cause branchio-oto-renal syndrome |
| Heterochromatin proteins | Epigenetic regulators of nephrogenesis | Novel modulators of branching |
| Vegfa | Angiogenic factor influencing branching | Interacts with Sema3a in kidney vascularization |
| Nrp1 | Neuropilin-1, receptor for Sema3a | Mediates Sema3a inhibitory signaling |
How Is negative regulation of branching involved in ureteric bud morphogenesis Regulated?
The negative regulation of ureteric bud branching is controlled by a balance of secreted inhibitors, transcription factors, and epigenetic modifiers. Sema3a is a key secreted inhibitor that acts through neuropilin-1/plexinA receptors to restrict branching. HNF1B regulates Notch signaling components and Irx1/2, which in turn influence nephron differentiation and indirectly modulate branching. Epigenetic regulators, such as heterochromatin proteins, have been identified as novel modulators of nephrogenesis, suggesting that chromatin remodeling can affect the expression of branching inhibitors. Additionally, positive signals like GDNF and FGFs are counteracted by negative regulators to ensure proper branching patterns.
negative regulation of branching involved in ureteric bud morphogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| HNF1B | Renal cysts and diabetes syndrome; CAKUT | Knockout or point-mutation in human iPSC-derived kidney organoids |
| Sema3a | CAKUT; abnormal branching | Overexpression or knockout in mouse embryonic kidney explants |
| Bmp4 | CAKUT; renal hypoplasia | Conditional knockout in ureteric bud lineage |
| Pax2 | Renal coloboma syndrome | Knock-in of patient mutations in mice |
| Eya1 | Branchio-oto-renal syndrome | Knockout mouse models |
Congenital anomalies of the kidney and urinary tract (CAKUT)
Disruption of negative regulation of ureteric bud branching can lead to CAKUT, a spectrum of disorders including renal hypoplasia, dysplasia, and hydronephrosis. Excessive branching or failure to restrict branching may result in abnormal collecting duct architecture and reduced nephron number. Mutations in genes such as HNF1B are associated with renal cysts and diabetes syndrome, which includes kidney malformations.
Renal cysts and diabetes syndrome (RCAD)
HNF1B mutations cause RCAD, characterized by renal cysts, diabetes, and other anomalies. HNF1B controls nephron segment identity and Notch signaling, and its loss leads to altered branching morphogenesis and cyst formation. This highlights how negative regulation of branching is intertwined with nephron differentiation.
Kidney cancer and regenerative medicine
Altered branching morphogenesis may predispose to Wilms tumor and other pediatric kidney cancers, although direct evidence is limited. In regenerative medicine, understanding negative regulators like Sema3a could help guide stem cell-derived kidney organoids to form proper collecting duct structures.
From negative regulation of branching involved in ureteric bud morphogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X negatively regulate ureteric bud branching? | Knockout of gene X in mouse embryonic kidney explants or CRISPR KO in ureteric bud cell lines |
| What is the effect of a patient mutation in HNF1B on branching? | Point mutation knock-in in iPSC-derived kidney organoids |
| Can overexpression of Sema3a rescue excessive branching? | Overexpression of Sema3a in embryonic kidney explants |
| Where is the protein localized during branching? | Tagged knock-in (e.g., GFP) in mouse or human cells |
| What genes are downstream of HNF1B? | RNA-seq after HNF1B knockout or knockdown |
| Can CRISPR library screening identify novel inhibitors of branching? | Genome-wide CRISPR knockout screen in ureteric bud organoids [1,2] |
How to Study the negative regulation of branching involved in ureteric bud morphogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Embryonic kidney organ culture | Branching morphogenesis in real time | Testing Sema3a or other inhibitors |
| RNA-seq | Global gene expression changes | Identifying downstream targets of HNF1B |
| Proteomics | Protein abundance and modifications | Discovering epigenetic regulators |
| CRISPR knockout | Loss-of-function effects | Validating negative regulators |
| CRISPR knock-in | Tagged or mutant protein expression | Localizing proteins in branching ureteric bud |
| Live imaging | Dynamic changes in ureteric bud shape | Quantifying branch number and length |
| GO enrichment analysis | Functional annotation of gene sets | Linking genes to GO:0090191 |
| Organoid culture | 3D kidney-like structures | Modeling human disease mutations |
Embryonic kidney organ culture and live imaging
Embryonic kidney explants can be cultured and treated with exogenous factors (e.g., Sema3a) or subjected to gene editing to observe effects on ureteric bud branching. Live imaging allows real-time tracking of branch number and morphology.
Transcriptomics and proteomics
RNA-seq and proteomic analysis of developing kidneys can identify genes and proteins differentially expressed during branching. Proteomic studies have revealed heterochromatin proteins as novel regulators of nephrogenesis.
CRISPR-Cas9 gene editing
CRISPR knockout, knock-in, and point mutations in ureteric bud cell lines or organoids enable functional dissection of candidate genes. For example, HNF1B mutations can be introduced into iPSCs to study their effects on branching.
Bioinformatics and pathway analysis
Integrating transcriptomic data with GO annotations can reveal enriched pathways related to negative regulation of branching. Tools like QuickGO and GO enrichment analysis help contextualize gene function.
How CRISPR Can Be Used to Study GO:0090191 negative regulation of branching involved in ureteric bud morphogenesis
Knockout
CRISPR knockout of candidate negative regulators (e.g., Sema3a) in ureteric bud cells or organoids can test whether loss of function increases branching. This approach is direct and scalable for high-throughput screens.
Point Mutation
Introducing patient-specific point mutations (e.g., in HNF1B) via CRISPR base editing or homology-directed repair allows precise modeling of disease variants and their impact on branching morphogenesis.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) or reporter genes into endogenous loci enables visualization of protein localization and dynamics during ureteric bud branching.
Overexpression
CRISPR activation (CRISPRa) or lentiviral overexpression can drive high levels of negative regulators like Sema3a to assess their ability to suppress branching in cultured kidneys.
How EDITGENE Supports negative regulation of branching involved in ureteric bud morphogenesis Research
Researchers studying negative regulation of branching involved in ureteric bud morphogenesis-related genes often need to determine whether a candidate gene is causally involved in this process. EDITGENE provides comprehensive CRISPR-based services to accelerate functional validation, from knockout to precise point mutations and overexpression, tailored for kidney developmental biology.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of branching involved in ureteric bud morphogenesis research.
Frequently Asked Questions About negative regulation of branching involved in ureteric bud morphogenesis
What is GO:0090191?
GO:0090191 is a Gene Ontology biological process term defined as any process that decreases the rate, frequency or extent of branching involved in ureteric bud morphogenesis, the process that forms the kidney collecting system.
What genes are involved in negative regulation of ureteric bud branching?
Key genes include Sema3a, which directly inhibits branching, and HNF1B, which indirectly modulates branching through Notch signaling. Other genes like Bmp4 and Pax2 also play roles.
How does Sema3a inhibit ureteric bud branching?
Sema3a binds to neuropilin-1 and plexinA receptors on ureteric bud cells, triggering cytoskeletal changes that reduce branching.
What diseases are associated with abnormal ureteric bud branching?
Disorders include congenital anomalies of the kidney and urinary tract (CAKUT), renal hypoplasia, dysplasia, and HNF1B-associated renal cysts and diabetes syndrome [2,4].
What experimental models are used to study GO:0090191?
Embryonic kidney organ culture, mouse genetic models, CRISPR-edited cell lines, and kidney organoids are commonly used [1,2,4].
How can CRISPR help study negative regulation of branching?
CRISPR knockout, knock-in, point mutations, and overexpression allow precise manipulation of candidate genes to test their function in branching morphogenesis [1,4].
What is the role of HNF1B in ureteric bud branching?
HNF1B controls nephron segment identity and Notch signaling, and its mutations lead to altered branching and kidney malformations.
Are there epigenetic regulators of ureteric bud branching?
Yes, proteomic studies have identified heterochromatin proteins as epigenetic regulators of nephrogenesis, potentially influencing branching.
What methods are used to measure ureteric bud branching?
Embryonic kidney explant culture with live imaging, RNA-seq, proteomics, and organoid assays are standard methods [1,3].
How does EDITGENE support research on GO:0090191?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services tailored to kidney developmental biology [1,4].
Conclusion
GO:0090191, negative regulation of branching involved in ureteric bud morphogenesis, is a critical process that ensures proper kidney development by restraining excessive branching. Key regulators such as Sema3a and HNF1B have been identified, and emerging evidence points to epigenetic and transcriptional networks [1,3,4]. Dysregulation of this process is linked to congenital kidney anomalies, making it a compelling area for further research. Advanced CRISPR tools and organoid models now enable precise functional studies, promising new insights into kidney disease and regeneration.
References
- 1. Tufro A et al.. 2008. Semaphorin3a inhibits ureteric bud branching morphogenesis.. Mech Dev 125(5-6):558-68 PMID: 18249526
- 2. Dressler GR. 2006. The cellular basis of kidney development.. Annu Rev Cell Dev Biol 22:509-29 PMID: 16822174
- 3. Dihazi GH et al.. 2015. Proteomic analysis of embryonic kidney development: Heterochromatin proteins as epigenetic regulators of nephrogenesis.. Sci Rep 5:13951 PMID: 26359909
- 4. Heliot C et al.. 2013. HNF1B controls proximal-intermediate nephron segment identity in vertebrates by regulating Notch signalling components and Irx1/2.. Development 140(4):873-85 PMID: 23362348
