GO:0001657 ureteric bud development: Branching Morphogenesis, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0001657 ureteric bud development describes the progression of the ureteric bud from its formation to its mature structure, encompassing outgrowth, branching, and collecting duct formation.
• The process is driven by reciprocal signaling between the ureteric bud epithelium and surrounding metanephric mesenchyme, with GDNF-RET, FGF, BMP, and Wnt pathways playing central roles.
• MicroRNAs and the renin-angiotensin system have emerged as important regulators of ureteric bud branching morphogenesis.
• Human pluripotent stem cell-derived ureteric bud and collecting duct organoids now provide powerful models to study this process and associated diseases.
• Disrupted ureteric bud development is linked to congenital anomalies of the kidney and urinary tract (CAKUT) and polycystic kidney disease.
• CRISPR-based knockout, knock-in, and overexpression models enable causal dissection of genes involved in ureteric bud development.
Description
Ureteric bud development (GO:0001657) is the biological process whose specific outcome is the progression of the ureteric bud over time, from its formation to the mature structure. The ureteric bud is an outgrowth of the Wolffian duct that invades the metanephric mesenchyme and undergoes iterative branching to form the collecting system of the kidney. This process is essential for establishing the renal architecture and ensuring proper urine concentration and excretion. Researchers study ureteric bud development to understand congenital kidney malformations, regenerative medicine approaches, and the pathogenesis of diseases such as CAKUT and polycystic kidney disease. Recent advances in human pluripotent stem cell-derived organoids have enabled directed differentiation of ureteric bud and collecting duct structures, providing new platforms for disease modeling and drug discovery.
ureteric bud development At A Glance
| GO ID | GO:0001657 |
|---|---|
| GO term | ureteric bud development |
| Ontology | biological_process |
| Synonym | none |
| Major function | Formation and branching of the ureteric bud to establish the renal collecting system |
| Key signaling pathways | GDNF-RET, FGF, BMP, Wnt, renin-angiotensin system |
| Associated diseases | CAKUT, polycystic kidney disease, renal agenesis |
| Model systems | Mouse embryonic kidney, human iPSC-derived organoids, CRISPR-edited cell lines |
What Is GO:0001657?
GO:0001657 ureteric bud development is defined as the process whose specific outcome is the progression of the ureteric bud over time, from its formation to the mature structure. This includes the initial outgrowth from the Wolffian duct, branching morphogenesis, and differentiation into the collecting duct system of the kidney.
Why Is ureteric bud development Important in Cell Biology?
Ureteric bud development is critical for kidney formation and function; defects in this process lead to congenital anomalies of the kidney and urinary tract (CAKUT), which account for a significant proportion of pediatric kidney failure. Understanding the molecular mechanisms governing ureteric bud branching has direct implications for regenerative medicine, as generating functional collecting duct structures from stem cells requires recapitulating this developmental program. Moreover, genes and pathways involved in ureteric bud development are frequently dysregulated in renal cell carcinoma and polycystic kidney disease, making this process a valuable source of therapeutic targets.
• Ureteric bud development is essential for establishing the renal collecting system and overall kidney architecture.
• Disruptions in ureteric bud branching cause congenital anomalies of the kidney and urinary tract (CAKUT).
• The process is regulated by a complex network of signaling pathways, including GDNF-RET, FGF, BMP, and Wnt.
• MicroRNAs modulate ureteric bud development, adding another layer of post-transcriptional control.
• The renin-angiotensin system plays a role in ureteric bud branching and collecting system development.
• Vacuolar ATPase regulates ureteric bud branching morphogenesis, linking cellular metabolism to developmental signaling.
• Human pluripotent stem cell-derived ureteric bud organoids enable disease modeling and drug screening.
• iPSC-derived collecting duct organoids model cystogenesis in ADPKD, highlighting the relevance to polycystic kidney disease.
• CRISPR gene editing allows functional interrogation of genes involved in ureteric bud development.
• Understanding ureteric bud development informs strategies for kidney regeneration and tissue engineering.
What Happens During ureteric bud development?
Induction and Outgrowth
In simple terms: The ureteric bud starts as a small bump on a duct and grows out toward the kidney tissue.
Ureteric bud development begins when the Wolffian duct evaginates to form the ureteric bud in response to inductive signals from the metanephric mesenchyme, primarily GDNF acting through RET receptor tyrosine kinase. This outgrowth is guided by reciprocal signaling between the ureteric bud epithelium and the surrounding mesenchyme, with FGF and BMP pathways modulating the response. The renin-angiotensin system has also been implicated in early ureteric bud formation and outgrowth.
Branching Morphogenesis
In simple terms: The bud splits repeatedly to create the tree-like network of tubes that will become the kidney's collecting system.
Once the ureteric bud invades the metanephric mesenchyme, it undergoes iterative branching morphogenesis, a process regulated by GDNF-RET, FGF, BMP, and Wnt signaling. Each branch tip induces surrounding mesenchymal cells to condense and form nephrons, while the ureteric bud derivatives will become the collecting ducts. MicroRNAs have been shown to fine-tune the expression of key branching regulators, and their dysregulation leads to abnormal branching. Vacuolar ATPase activity is required for proper branching morphogenesis, linking cellular pH and metabolic regulation to this developmental process.
Elongation and Differentiation
In simple terms: The branches lengthen and mature into the final collecting ducts that carry urine.
As branching proceeds, the ureteric bud derivatives elongate and differentiate into the collecting duct system, a process that involves changes in cell polarity, proliferation, and gene expression. The renin-angiotensin system contributes to the maturation and functional development of the collecting system. Human pluripotent stem cell-derived organoids have been used to model the directed differentiation of ureteric bud and collecting duct cells, revealing conserved mechanisms.
Integration with Nephron Formation
In simple terms: The growing collecting tubes connect with the filtering units of the kidney to form a functional organ.
Proper integration of the ureteric bud-derived collecting system with nephron precursors is essential for kidney function. Recent studies have shown that fusion of distal nephron to ureteric bud can be achieved in human kidney organoids, modeling the connection between the filtering and collecting compartments. This integration is critical for urine concentration and overall kidney physiology.
Key Genes Involved in GO:0001657 ureteric bud development
The following genes and proteins are central to ureteric bud development, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| GDNF | Secreted factor from metanephric mesenchyme that induces ureteric bud outgrowth via RET | Knockout causes renal agenesis; target for organoid differentiation protocols |
| RET | Receptor tyrosine kinase for GDNF; mediates ureteric bud induction and branching | Mutations linked to CAKUT; key node in signaling network |
| GFRA1 | Co-receptor for GDNF that facilitates RET activation | Modulates GDNF signaling strength; studied in branching morphogenesis |
| FGF10 | Mesenchymal factor that promotes ureteric bud branching | Knockout leads to branching defects; used in organoid culture |
| FGFR2 | Receptor for FGF10 on ureteric bud epithelium | Mediates FGF signaling; conditional knockout models available |
| BMP4 | Signaling molecule that inhibits ectopic ureteric bud formation | Regulates branching pattern; knockout causes abnormal kidneys |
| WNT9B | Secreted Wnt ligand that induces ureteric bud outgrowth | Essential for ureteric bud induction; knockout causes renal agenesis |
| WNT11 | Wnt ligand expressed in ureteric bud tips; regulates branching | Modulates branching morphogenesis; knockout shows reduced branching |
| PAX2 | Transcription factor required for ureteric bud lineage specification | Mutations cause CAKUT; key marker of ureteric bud cells |
| SIX1 | Transcription factor involved in ureteric bud outgrowth | Knockout leads to renal hypoplasia; interacts with PAX2 |
| EYA1 | Transcriptional co-activator that partners with SIX1 | Mutations cause branchio-oto-renal syndrome; affects ureteric bud development |
| AGTR1 | Angiotensin II receptor type 1; mediates renin-angiotensin system effects | Regulates ureteric bud branching; knockout shows collecting system defects |
| AGTR2 | Angiotensin II receptor type 2; modulates branching morphogenesis | Opposes AGTR1 effects; knockout alters ureteric bud development |
| REN | Renin; rate-limiting enzyme of renin-angiotensin system | Expressed in developing kidney; affects ureteric bud branching |
| ATP6V1A | Vacuolar ATPase subunit; regulates vesicular pH | Knockdown impairs ureteric bud branching in vitro |
| DICER1 | RNase III enzyme required for microRNA processing | Conditional knockout in ureteric bud causes branching defects |
| miR-200 family | MicroRNAs that modulate epithelial-mesenchymal interactions | Regulate ureteric bud branching; targets include Zeb1/2 |
| HNF1B | Transcription factor expressed in ureteric bud and collecting ducts | Mutations cause renal cysts and diabetes syndrome; key for collecting duct differentiation |
How Is ureteric bud development Regulated?
Ureteric bud development is regulated by a complex interplay of signaling pathways, transcription factors, and post-transcriptional modifiers. The GDNF-RET pathway is the primary inductive signal, but it is modulated by FGF, BMP, and Wnt signaling. MicroRNAs, such as those processed by DICER1, fine-tune gene expression during branching morphogenesis. The renin-angiotensin system, through AGTR1 and AGTR2, influences ureteric bud branching and collecting duct development. Additionally, vacuolar ATPase activity is required for proper branching, linking cellular metabolism to developmental regulation. These regulatory layers ensure precise spatiotemporal control of ureteric bud development.
ureteric bud development and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| RET | CAKUT, Hirschsprung disease | Knockout mouse, iPSC-derived ureteric bud organoids |
| PAX2 | CAKUT, renal coloboma syndrome | Conditional knockout in mouse ureteric bud, CRISPR KO in human organoids |
| HNF1B | Renal cysts and diabetes syndrome | iPSC-derived collecting duct organoids, CRISPR knock-in of patient mutations |
| PKD1 | Autosomal dominant polycystic kidney disease | iPSC-derived collecting duct organoids, CRISPR KO |
| AGTR1 | Urinary tract anomalies, hypertension | Knockout mouse, overexpression in cell lines |
Congenital Anomalies of the Kidney and Urinary Tract (CAKUT)
Disruptions in ureteric bud development are a major cause of CAKUT, which includes renal agenesis, hypoplasia, and duplex collecting systems. Mutations in genes such as RET, GDNF, PAX2, and EYA1 have been associated with CAKUT in humans. The renin-angiotensin system also plays a role; polymorphisms in AGTR1 and AGTR2 have been linked to urinary tract anomalies.
Polycystic Kidney Disease
Polycystic kidney disease, particularly autosomal dominant polycystic kidney disease (ADPKD), involves abnormal tubule formation and cystogenesis that can originate from collecting duct cells. Human iPSC-derived collecting duct organoids have been used to model cystogenesis in ADPKD, demonstrating the relevance of ureteric bud development to this disease. Mutations in PKD1 or PKD2 lead to cyst formation in the collecting ducts, which are derived from the ureteric bud.
Renal Cell Carcinoma
While not a direct developmental disorder, renal cell carcinoma (RCC) can exhibit reactivation of developmental pathways. Genes involved in ureteric bud development, such as RET and WNT signaling components, are sometimes dysregulated in RCC, suggesting that developmental programs may be co-opted in cancer.
From ureteric bud development-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate ureteric bud branching? | CRISPR knockout in mouse embryonic kidney or human iPSC-derived organoids |
| Does a specific point mutation in gene Y cause CAKUT? | CRISPR point mutation knock-in in iPSCs followed by organoid differentiation |
| What is the role of gene Z in collecting duct differentiation? | CRISPR knock-in of fluorescent reporter or epitope tag |
| Can overexpression of gene W rescue branching defects? | CRISPR-mediated overexpression in ureteric bud cell lines or organoids |
| Which genes are essential for ureteric bud induction? | CRISPR library screening in differentiating iPSCs |
| How does a disease-associated variant affect protein function? | CRISPR knock-in of variant in HEK293 or ureteric bud cells |
How to Study the ureteric bud development Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Organoid differentiation | Formation of ureteric bud and collecting duct structures | Modeling human kidney development and disease |
| CRISPR knockout | Loss-of-function effects on ureteric bud development | Identifying essential genes |
| CRISPR knock-in | Effects of specific mutations or tags | Modeling patient variants, reporter lines |
| RNA-seq | Transcriptional changes during development | Discovering gene expression dynamics |
| Single-cell RNA-seq | Cell-type-specific expression and heterogeneity | Mapping ureteric bud cell lineages |
| Live imaging | Branching morphogenesis dynamics | Visualizing real-time development |
| Proteomics | Protein expression and modifications | Identifying signaling changes |
| Bioinformatics pathway analysis | Enriched pathways and networks | Prioritizing candidate regulators |
Organoid Culture and Differentiation
Human pluripotent stem cells can be directed to differentiate into ureteric bud and collecting duct organoids using defined protocols. These organoids recapitulate key aspects of ureteric bud development, including branching and collecting duct formation, and can be used to study gene function and disease mechanisms. Integration of distal nephron with ureteric bud in organoids allows modeling of the complete collecting system.
CRISPR-Cas9 Genome Editing
CRISPR-Cas9 enables precise knockout, knock-in, or point mutation of genes in cell lines and organoids. This approach has been used to dissect the roles of genes such as RET, PAX2, and HNF1B in ureteric bud development. Pooled CRISPR library screening can identify novel regulators of ureteric bud branching when combined with organoid differentiation and sequencing readouts.
Transcriptomics and Bioinformatics
RNA sequencing of developing kidneys or organoids at different stages reveals dynamic gene expression changes during ureteric bud development. Bioinformatics analyses, such as pathway enrichment and gene regulatory network inference, help identify key drivers and modules. Single-cell RNA-seq can resolve heterogeneity within the ureteric bud and surrounding mesenchyme.
Imaging and Lineage Tracing
Live imaging of organotypic cultures or genetically labeled mouse models allows visualization of ureteric bud branching dynamics. Lineage tracing using Cre-lox systems can determine the fate of ureteric bud cells and their contribution to the collecting system. Fluorescent reporters for key genes (e.g., RET, WNT11) facilitate real-time monitoring of developmental processes.
How CRISPR Can Be Used to Study GO:0001657 ureteric bud development
Knockout
CRISPR knockout of genes such as RET, GDNF, or PAX2 in human iPSCs followed by directed differentiation into ureteric bud organoids can reveal their requirement for bud formation and branching. Knockout studies in mouse models have established critical roles for these genes in ureteric bud development.
Point Mutation
Introducing disease-associated point mutations (e.g., in HNF1B or PKD1) into iPSCs using CRISPR base editing or homology-directed repair allows modeling of CAKUT or ADPKD in collecting duct organoids. These models can reveal how specific variants alter protein function and developmental outcomes.
Knock-in
Knock-in of fluorescent reporters (e.g., GFP into the RET locus) or epitope tags enables live tracking of ureteric bud cells and biochemical analysis of protein interactions. Knock-in of Cre recombinase allows lineage tracing in organoids or mouse models.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression of genes such as GDNF or WNT11 can test sufficiency for ureteric bud induction or branching. Overexpression in organoid cultures can rescue loss-of-function phenotypes or drive ectopic bud formation.
How EDITGENE Supports ureteric bud development Research
Researchers studying ureteric bud development-related genes often need to determine whether a candidate gene is causally involved in bud formation, branching, or collecting duct differentiation. EDITGENE provides a comprehensive suite of CRISPR services to accelerate this research, from knockout and point mutation to knock-in and overexpression, as well as library screening and bioinformatics.
Contact EDITGENE today to design your custom CRISPR model for ureteric bud development research.
Frequently Asked Questions About ureteric bud development
What is ureteric bud development?
Ureteric bud development (GO:0001657) is the biological process by which the ureteric bud forms from the Wolffian duct, invades the metanephric mesenchyme, and branches to give rise to the collecting duct system of the kidney.
What genes are involved in ureteric bud development?
Key genes include GDNF, RET, GFRA1, FGF10, FGFR2, BMP4, WNT9B, WNT11, PAX2, SIX1, EYA1, AGTR1, AGTR2, REN, ATP6V1A, DICER1, and HNF1B.
How is ureteric bud development regulated?
It is regulated by signaling pathways such as GDNF-RET, FGF, BMP, Wnt, and the renin-angiotensin system, as well as microRNAs and vacuolar ATPase.
What diseases are associated with defective ureteric bud development?
Defects can lead to congenital anomalies of the kidney and urinary tract (CAKUT), renal agenesis, hypoplasia, and polycystic kidney disease.
What model systems are used to study ureteric bud development?
Common models include mouse embryonic kidneys, human pluripotent stem cell-derived ureteric bud and collecting duct organoids, and CRISPR-edited cell lines.
Can CRISPR be used to study ureteric bud development?
Yes, CRISPR knockout, knock-in, point mutation, and overexpression are powerful tools to dissect gene function in ureteric bud development and disease modeling.
What is the role of GDNF in ureteric bud development?
GDNF is a secreted factor from the metanephric mesenchyme that binds to RET receptor tyrosine kinase on the ureteric bud, inducing outgrowth and branching.
How do microRNAs affect ureteric bud development?
MicroRNAs, processed by DICER1, modulate the expression of key developmental genes and are essential for proper branching morphogenesis.
What is the renin-angiotensin system's role in ureteric bud development?
The renin-angiotensin system, through AGTR1 and AGTR2, regulates ureteric bud branching and collecting duct development.
What are ureteric bud organoids?
Ureteric bud organoids are three-dimensional structures derived from pluripotent stem cells that recapitulate key aspects of ureteric bud development, including branching and collecting duct formation.
Conclusion
Ureteric bud development (GO:0001657) is a fundamental process in kidney formation, governed by a complex network of signaling pathways and transcriptional regulators. Understanding its mechanisms is crucial for deciphering the etiology of congenital kidney anomalies and for advancing regenerative medicine. Recent breakthroughs in organoid technology and CRISPR genome editing have opened new avenues for modeling human ureteric bud development and disease, enabling high-throughput functional genomics and drug discovery. Continued research in this field promises to yield insights that translate into improved diagnostics and therapies for kidney diseases.
References
- 1. Shi M et al.. 2023. Directed differentiation of ureteric bud and collecting duct organoids from human pluripotent stem cells.. Nat Protoc 18(8):2485-2508 PMID: 37460630
- 2. Yu J. 2014. miRNAs in mammalian ureteric bud development.. Pediatr Nephrol 29(4):745-9 PMID: 24452329
- 3. Michos O. 2009. Kidney development: from ureteric bud formation to branching morphogenesis.. Curr Opin Genet Dev 19(5):484-90 PMID: 19828308
- 4. Sakurai H. 2003. Molecular mechanism of ureteric bud development.. Semin Cell Dev Biol 14(4):217-24 PMID: 14627120
- 5. Shi M et al.. 2025. Integrating collecting systems in human kidney organoids through fusion of distal nephron to ureteric bud.. Cell Stem Cell 32(7):1055-1070.e8 PMID: 40345193
- 6. Mae SI et al.. 2023. Human iPSC-derived renal collecting duct organoid model cystogenesis in ADPKD.. Cell Rep 42(12):113431 PMID: 38039961
- 7. Yosypiv IV et al.. 2026. Vacuolar ATPase regulates ureteric bud branching morphogenesis during kidney development.. Am J Physiol Regul Integr Comp Physiol 330(2):R166-R173 PMID: 41543353
- 8. Yosypiv IV. 2008. A new role for the renin-angiotensin system in the development of the ureteric bud and renal collecting system.. Keio J Med 57(4):184-9 PMID: 19110530
