GO:0090190 positive regulation of branching involved in ureteric bud morphogenesis: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0090190 describes any process that increases the rate, frequency or extent of branching of the ureteric bud, the epithelial tube that gives rise to the ureter and kidney collecting system.
• Ureteric bud branching is driven by reciprocal signaling between the metanephric mesenchyme and the ureteric bud epithelium, with GDNF-RET as the central inductive axis.
• Positive regulators include GDNF, RET, GFRα1, Wnt11, BMP4, FGFs, and transcription factors such as PAX2, EYA1, SIX1, and WT1.
• Branching morphogenesis determines final nephron number; its dysregulation is linked to congenital anomalies of the kidney and urinary tract (CAKUT).
• Studying GO:0090190 requires combining genetic models, live imaging, and transcriptomic/proteomic profiling to resolve signaling dynamics.
• CRISPR-based knockout, knock-in, and overexpression models enable causal testing of candidate regulators of ureteric bud branching.
Description
GO:0090190, positive regulation of branching involved in ureteric bud morphogenesis, is a biological process term that captures the molecular and cellular events that enhance the branching of the ureteric bud during kidney development. The ureteric bud is an epithelial outgrowth of the metanephric duct that invades the metanephric mesenchyme and undergoes iterative branching to form the collecting duct system and ureter. Because branching determines the number of nephrons and the overall architecture of the kidney, positive regulators of this process are central to renal organogenesis. Researchers study GO:0090190 to understand how signaling between the mesenchyme and the ureteric bud epithelium is coordinated, and how perturbations lead to congenital kidney malformations. The term is defined in QuickGO as any process that increases the rate, frequency or extent of branching involved in ureteric bud morphogenesis, the process in which the branching structure of the ureteric bud is generated and organized. This article synthesizes the current understanding of the mechanisms, key genes, disease links, and experimental approaches relevant to GO:0090190, based on published literature.
positive regulation of branching involved in ureteric bud morphogenesis At A Glance
| GO ID | GO:0090190 |
|---|---|
| GO term | positive regulation of branching involved in ureteric bud morphogenesis |
| Ontology | biological_process |
| Synonym | none |
| Major function | Enhances the rate, frequency, or extent of ureteric bud branching during kidney development |
| Related process | ureteric bud morphogenesis, branching morphogenesis, kidney development |
| Key signaling axis | GDNF-RET and reciprocal mesenchymal-epithelial interactions |
| Disease relevance | Congenital anomalies of the kidney and urinary tract (CAKUT) |
What Is GO:0090190?
GO:0090190 refers to any biological process that positively regulates the branching of the ureteric bud, the embryonic epithelial tube that elongates and branches to form the ureter and kidney collecting tubules. It encompasses signaling events, transcriptional programs, and cellular behaviors that increase the rate, frequency, or extent of ureteric bud branching during kidney development.
Why Is positive regulation of branching involved in ureteric bud morphogenesis Important in Cell Biology?
Understanding GO:0090190 is critical because ureteric bud branching is a foundational step in kidney development, and its positive regulation directly influences nephron endowment and urinary tract architecture. Defects in branching lead to a spectrum of congenital kidney and urinary tract anomalies, making this process a key focus for developmental biologists and clinicians.
• Determines final nephron number and kidney size
• Underlies congenital anomalies of the kidney and urinary tract (CAKUT)
• Involves conserved signaling pathways (GDNF-RET, Wnt, BMP, FGF)
• Provides a model for epithelial branching in other organs
• Offers targets for regenerative medicine and tissue engineering
• Enables study of mesenchymal-epithelial induction
• Links developmental biology to pediatric nephrology
• Guides CRISPR-based disease modeling
What Happens During positive regulation of branching involved in ureteric bud morphogenesis?
Inductive signaling from the metanephric mesenchyme
In simple terms: The surrounding tissue sends signals that tell the ureteric bud to grow and branch.
The metanephric mesenchyme secretes GDNF, which binds to the RET receptor tyrosine kinase and its co-receptor GFRα1 on the ureteric bud epithelium, triggering positive regulation of branching. This inductive signal is a primary driver of ureteric bud outgrowth and subsequent branching.
RET-mediated intracellular signaling
In simple terms: The signal is relayed inside the bud cells to promote growth and branching.
Activated RET initiates intracellular cascades including MAPK and PI3K pathways that promote cell proliferation, survival, and migration, thereby increasing the rate and extent of ureteric bud branching. Positive regulators of this pathway enhance branching morphogenesis.
Transcriptional control of branching regulators
In simple terms: Master transcription factors turn on genes that drive branching.
Transcription factors such as PAX2, EYA1, SIX1, and WT1 regulate the expression of GDNF, RET, and other components, thereby positively regulating ureteric bud branching. Their activity is essential for maintaining the branching program.
Feedback and modulation by Wnt, BMP, and FGF signals
In simple terms: Other signals fine-tune the branching process to ensure proper shape.
Wnt11, BMP4, and FGFs modulate the GDNF-RET axis, either enhancing or restricting branching to shape the ureteric tree. Positive regulation of branching involves a balance of these signals to achieve proper arborization.
Key Genes Involved in GO:0090190 positive regulation of branching involved in ureteric bud morphogenesis
The following genes and proteins are central to the positive regulation of ureteric bud branching, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GDNF | Secreted ligand that activates RET to induce branching | Key inductive signal; knockout causes renal agenesis |
| RET | Receptor tyrosine kinase mediating GDNF signaling | Mutations linked to CAKUT and Hirschsprung disease |
| GFRα1 | Co-receptor for GDNF, required for RET activation | Essential for GDNF-RET signaling |
| Wnt11 | Secreted signal that modulates ureteric bud branching | Regulates branching dynamics |
| BMP4 | Modulates branching and mesenchymal-epithelial interactions | Involved in patterning the ureteric tree |
| PAX2 | Transcription factor regulating GDNF and RET expression | Mutations cause renal-coloboma syndrome |
| EYA1 | Transcription co-activator essential for kidney development | Mutations cause branchio-oto-renal syndrome |
| SIX1 | Transcription factor interacting with EYA1 | Mutations associated with CAKUT |
| WT1 | Transcription factor required for metanephric mesenchyme induction | Mutations cause Wilms tumor and nephropathy |
| FGF2 | Growth factor that can promote branching | Modulates ureteric bud growth |
| FGF7 | Growth factor influencing branching morphogenesis | Studied in kidney organ culture |
| FGF10 | Growth factor involved in branching of multiple organs | Potential regulator of ureteric bud branching |
| SALL1 | Transcription factor linked to kidney development | Mutations cause Townes-Brocks syndrome |
| GATA3 | Transcription factor required for ureteric bud elongation | Mutations cause HDR syndrome |
| LGR4 | Receptor that modulates Wnt signaling in ureteric bud | Regulates branching and nephron number |
| LGR5 | Receptor marking ureteric bud tip cells | Stem/progenitor marker in kidney development |
| SOX9 | Transcription factor in ureteric bud tips | Regulates progenitor maintenance |
How Is positive regulation of branching involved in ureteric bud morphogenesis Regulated?
Positive regulation of ureteric bud branching is controlled by a network of secreted ligands, receptor tyrosine kinases, and transcription factors. The GDNF-RET axis is the primary inductive pathway, and its activity is modulated by Wnt, BMP, and FGF signals that fine-tune branching patterns. Feedback mechanisms ensure balanced growth and arborization, and disruption of these regulatory loops leads to congenital kidney anomalies.
positive regulation of branching involved in ureteric bud morphogenesis and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RET | CAKUT, Hirschsprung disease | Knockout mouse, patient iPSC-derived kidney organoids |
| GDNF | Renal agenesis/hypoplasia | Conditional knockout mouse |
| PAX2 | Renal-coloboma syndrome | Knock-in mouse with patient mutation |
| EYA1 | Branchio-oto-renal syndrome | Knockout mouse, zebrafish |
| SIX1 | CAKUT | Knockout mouse |
Congenital anomalies of the kidney and urinary tract (CAKUT)
Mutations in genes that positively regulate ureteric bud branching, such as RET, GDNF, PAX2, EYA1, and SIX1, are associated with CAKUT, a spectrum of malformations including renal agenesis, hypoplasia, and duplex kidney. These defects arise from disrupted branching morphogenesis during development.
Renal agenesis and hypoplasia
Loss of positive regulators like GDNF or RET leads to failure of ureteric bud outgrowth and branching, resulting in renal agenesis or severe hypoplasia in animal models. This highlights the critical role of GO:0090190 in ensuring adequate nephron endowment.
Branchio-oto-renal syndrome
Mutations in EYA1 or SIX1, which regulate branching, cause branchio-oto-renal syndrome, characterized by kidney malformations, branchial arch defects, and hearing loss. This links positive regulation of ureteric bud branching to human syndromic disease.
From positive regulation of branching involved in ureteric bud morphogenesis-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X positively regulate ureteric bud branching? | Knockout mouse or organ culture |
| What is the effect of a specific point mutation in RET? | Point-mutation knock-in mouse |
| How does overexpression of GDNF affect branching? | Transgenic overexpression mouse |
| Where is the protein localized during branching? | Tagged knock-in (e.g., GFP) mouse |
| Can human mutations be modeled in vitro? | Patient iPSC-derived kidney organoids |
| What are the transcriptomic changes during branching? | RNA-seq of microdissected ureteric buds |
How to Study the positive regulation of branching involved in ureteric bud morphogenesis Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Knockout mouse | Loss-of-function effect on branching | Causal gene testing |
| Knock-in mouse | Effect of specific mutations | Disease modeling |
| Live imaging | Branching dynamics | Visualizing morphogenesis |
| RNA-seq | Transcriptional changes | Identifying regulators |
| Proteomics | Protein expression and interactions | Pathway analysis |
| Kidney organoids | Human branching morphogenesis | Disease modeling and drug testing |
| CRISPR screening | High-throughput gene function | Discovery of novel regulators |
Genetic knockout and knock-in models
Knockout and knock-in mouse models are used to test the causal role of candidate genes in positive regulation of ureteric bud branching. Conditional alleles allow temporal and tissue-specific manipulation.
Live imaging of branching morphogenesis
Time-lapse imaging of kidney organ cultures or explants enables visualization of ureteric bud branching dynamics and the effects of genetic perturbations.
Transcriptomic and proteomic profiling
RNA-seq and proteomics of ureteric bud tissue can identify genes and pathways that are differentially regulated during branching, revealing novel positive regulators.
Organoid and cell culture systems
Kidney organoids derived from pluripotent stem cells provide a human-relevant platform to study branching and test gene function via CRISPR editing.
How CRISPR Can Be Used to Study GO:0090190 positive regulation of branching involved in ureteric bud morphogenesis
Knockout
CRISPR knockout of candidate genes in mouse models or human organoids can test whether they are required for positive regulation of ureteric bud branching. Loss of function often results in reduced branching or renal agenesis.
Point Mutation
Introducing patient-specific point mutations (e.g., in RET or PAX2) via CRISPR allows precise modeling of CAKUT-associated variants and assessment of their impact on branching.
Knock-in
Knock-in of reporter tags (e.g., GFP) or conditional alleles enables visualization and temporal control of genes involved in branching.
Overexpression
CRISPR activation or transgenic overexpression can enhance gene expression to test sufficiency for promoting ureteric bud branching.
How EDITGENE Supports positive regulation of branching involved in ureteric bud morphogenesis Research
Researchers studying positive regulation of branching involved in ureteric bud morphogenesis-related genes often need to determine whether a candidate gene is causally involved in the process, and CRISPR-based models provide a robust way to test this.
Contact EDITGENE today to design your custom CRISPR model for positive regulation of branching involved in ureteric bud morphogenesis research.
Frequently Asked Questions About positive regulation of branching involved in ureteric bud morphogenesis
What is GO:0090190?
GO:0090190 is the Gene Ontology term for positive regulation of branching involved in ureteric bud morphogenesis, describing processes that increase the rate, frequency, or extent of ureteric bud branching during kidney development.
What genes are involved in positive regulation of ureteric bud branching?
Key genes include GDNF, RET, GFRα1, Wnt11, BMP4, PAX2, EYA1, SIX1, and WT1, among others.
Why is ureteric bud branching important?
It determines nephron number and kidney architecture; defects cause congenital anomalies of the kidney and urinary tract.
What diseases are linked to GO:0090190?
CAKUT, renal agenesis, hypoplasia, and branchio-oto-renal syndrome are associated with disrupted branching.
How can CRISPR be used to study ureteric bud branching?
CRISPR knockout, knock-in, point mutation, and overexpression models allow causal testing of candidate genes in vitro and in vivo.
What model systems are used to study ureteric bud branching?
Mouse genetic models, kidney organoids, and organ culture systems are commonly used.
What signaling pathways regulate ureteric bud branching?
The GDNF-RET pathway is central, with modulation by Wnt, BMP, and FGF signals.
How does GDNF regulate ureteric bud branching?
GDNF secreted by the metanephric mesenchyme binds RET/GFRα1 on the ureteric bud, activating intracellular cascades that promote branching.
What is the role of RET in kidney development?
RET is the receptor tyrosine kinase that mediates GDNF signaling to drive ureteric bud outgrowth and branching.
Can ureteric bud branching be studied in vitro?
Yes, kidney organoids and explant cultures allow real-time observation and manipulation of branching.
Conclusion
GO:0090190 captures the positive regulation of ureteric bud branching, a process fundamental to kidney development and nephron endowment. Understanding its genetic and signaling basis provides insights into congenital kidney diseases and offers targets for regenerative strategies. CRISPR-based models and advanced profiling methods continue to illuminate the regulatory networks involved.
References
- 1. Dressler GR. 2006. The cellular basis of kidney development.. Annu Rev Cell Dev Biol 22:509-29 PMID: 16822174
- 2. Nigam SK et al.. 2009. How does the ureteric bud branch?. J Am Soc Nephrol 20(7):1465-9 PMID: 19056872
