GO:0055113 epiboly involved in gastrulation with mouth forming second: Morphogenetic Movements, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0055113 describes epiboly, the expansion of one cell sheet over other cells, specifically during deuterostomic gastrulation (mouth forming second).
• This process is a hallmark of early embryogenesis in deuterostomes, driving the coordinated movement of ectodermal and endodermal layers.
• Key cellular behaviors include cell shape changes, directed migration, and intercalation, which are regulated by conserved signaling pathways.
• Studying epiboly provides insights into birth defects, cancer metastasis, and tissue engineering.
• CRISPR-based models (knockout, knock-in, overexpression) enable precise functional dissection of genes controlling epiboly.
• Advanced imaging and multi-omics approaches are essential to capture the dynamic and mechanical aspects of epiboly.
Description
Epiboly involved in gastrulation with mouth forming second (GO:0055113) is a fundamental morphogenetic process in deuterostome embryos, where an expanding cell sheet spreads over underlying cells to shape the early body plan. This term captures the coordinated movements that occur during gastrulation, a stage critical for germ layer formation and axis specification. In deuterostomes, the mouth forms secondarily, and epiboly ensures proper coverage of the yolk or inner cell mass by the ectoderm, setting the stage for subsequent organogenesis. Understanding epiboly is essential for developmental biologists, as defects in these movements can lead to severe congenital anomalies and are implicated in metastatic processes. Moreover, the molecular players driving epiboly are highly conserved, offering a window into basic cell biology and tissue mechanics. This article synthesizes current knowledge on the definition, mechanisms, key genes, and research methodologies for studying GO:0055113, with a focus on CRISPR-based approaches for functional validation.
epiboly involved in gastrulation with mouth forming second At A Glance
| GO ID | GO:0055113 |
|---|---|
| GO term | epiboly involved in gastrulation with mouth forming second |
| Ontology | biological_process |
| Synonym | None |
| Major function | Expansion of one cell sheet over other cells during deuterostomic gastrulation |
| Organism scope | Deuterostomes (e.g., vertebrates, echinoderms) |
| Developmental stage | Gastrulation |
| Related processes | Cell migration, cell shape change, epithelial morphogenesis |
What Is GO:0055113?
According to the Gene Ontology, GO:0055113 refers to the expansion of one cell sheet over other cells involved in deuterostomic gastrulation. In simpler terms, it is the process by which an epithelial layer spreads and covers deeper cell layers during the early embryonic stage when the mouth is formed secondarily. This definition emphasizes the directional movement and spreading of a cell population, a key event in shaping the embryo.
Why Is epiboly involved in gastrulation with mouth forming second Important in Cell Biology?
Epiboly is a cornerstone of deuterostome embryogenesis, ensuring the proper layering of germ layers and the physical shaping of the embryo. Disruptions in epiboly can result in incomplete coverage of the yolk or abnormal tissue positioning, leading to embryonic lethality or congenital defects. Beyond development, the cellular mechanisms underlying epiboly, such as collective cell migration and epithelial remodeling, are co-opted in pathological conditions like cancer invasion and wound healing. Thus, studying GO:0055113 not only illuminates fundamental developmental principles but also provides a framework for understanding human diseases and for advancing regenerative medicine.
• Critical for germ layer formation and axis establishment in deuterostomes.
• Defects in epiboly are linked to neural tube defects and other congenital anomalies.
• Provides a model for collective cell migration, relevant to cancer metastasis.
• Informs tissue engineering and regenerative strategies by revealing principles of epithelial spreading.
• Conserved molecular pathways offer insights into evolution of deuterostome development.
• Essential for understanding how mechanical forces shape embryos.
• Serves as a paradigm for studying cell-cell communication during morphogenesis.
• Highlights the interplay between gene regulation and cell behavior.
What Happens During epiboly involved in gastrulation with mouth forming second?
Initiation and Cell Shape Changes
In simple terms: Cells in the outer layer change shape to start spreading over the inner cells.
Epiboly begins with the flattening and radial intercalation of cells in the ectodermal layer, driven by actomyosin network rearrangements. These shape changes increase the surface area of the cell sheet, allowing it to cover the underlying yolk or endodermal cells. In deuterostomes, this phase is marked by the formation of a leading edge that will guide the advancing sheet.
Directed Migration and Sheet Spreading
In simple terms: The outer cell sheet actively moves to cover the deeper cells.
Following initiation, the ectodermal sheet undergoes directed migration, often guided by chemotactic cues and substrate adhesion. Cells at the leading edge extend protrusions and pull the sheet forward, while cells behind provide pushing forces through proliferation and intercalation. This coordinated movement ensures the complete envelopment of the inner cell mass, a hallmark of deuterostomic gastrulation.
Intercalation and Tissue Remodeling
In simple terms: Cells rearrange within the sheet to make it thinner and wider.
Radial intercalation, where cells insert between one another, reduces the number of cell layers and expands the tissue surface. This remodeling is essential for the sheet to accommodate the increasing embryo size and to maintain mechanical integrity. Concurrently, junctional remodeling and extracellular matrix deposition stabilize the spreading sheet.
Completion and Germ Layer Positioning
In simple terms: The sheet fully covers the inner cells, setting up the body plan.
Epiboly concludes when the ectodermal sheet completely encloses the inner cell mass, leaving only the blastopore or its equivalent. This positioning establishes the three germ layers and defines the future dorsal-ventral and anterior-posterior axes. Failure to complete epiboly results in arrested development and embryonic lethality.
Key Genes Involved in GO:0055113 epiboly involved in gastrulation with mouth forming second
The following genes are representative of the molecular machinery driving epiboly in deuterostomes, based on studies in model organisms such as Crepidula fornicata and other deuterostomes.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Actin (ACTB) | Cytoskeletal dynamics | Cell shape changes and migration |
| Myosin II (MYH9) | Contractility | Driving force for sheet spreading |
| E-cadherin (CDH1) | Cell-cell adhesion | Maintaining sheet integrity |
| N-cadherin (CDH2) | Adhesion dynamics | Remodeling during intercalation |
| RhoA (RHOA) | Signaling | Regulating actomyosin contraction |
| ROCK (ROCK1) | Kinase | Actomyosin activation |
| Wnt (WNT11) | Signaling | Convergent extension and migration |
| FGF (FGF8) | Signaling | Guidance of cell movements |
| Integrin (ITGB1) | Matrix adhesion | Substrate traction during migration |
| Fibronectin (FN1) | ECM component | Providing migratory tracks |
| Laminin (LAMB1) | ECM component | Basement membrane assembly |
| Cdc42 (CDC42) | Signaling | Leading edge protrusion |
| Rac1 (RAC1) | Signaling | Lamellipodia formation |
| Par3 (PARD3) | Polarity | Apicobasal polarity establishment |
| aPKC (PRKCI) | Polarity kinase | Maintaining polarity during migration |
| Snail (SNAI1) | Transcription factor | EMT-like changes during gastrulation |
| Twist (TWIST1) | Transcription factor | Mesoderm specification and movement |
How Is epiboly involved in gastrulation with mouth forming second Regulated?
Epiboly is regulated by a complex interplay of signaling pathways, including Wnt, FGF, and BMP, which control cell fate and motility. Mechanical forces generated by actomyosin contractility feed back to regulate gene expression via mechanotransduction pathways. Additionally, cell polarity complexes such as Par3/aPKC ensure directed migration and proper sheet orientation. The process is also modulated by extracellular matrix stiffness and composition, which influence integrin signaling and cytoskeletal dynamics.
epiboly involved in gastrulation with mouth forming second and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CDH1 | Cancer metastasis, gastric cancer | Knockout in cancer cell lines |
| RHOA | Cell migration disorders | Point mutation knock-in in zebrafish |
| WNT11 | Congenital heart defects | Overexpression in Xenopus |
| FN1 | Fibrotic diseases | Knock-in of tagged fibronectin in mouse |
| PARD3 | Epithelial polarity defects | Knockout in organoids |
Epiboly Defects and Congenital Anomalies
Disruptions in epiboly-like movements during human embryogenesis are associated with neural tube defects and other congenital malformations. Although direct studies in humans are limited, model organisms have revealed that mutations in genes controlling cell adhesion and migration lead to incomplete tissue coverage.
Cancer Metastasis as Aberrant Epiboly
The collective cell migration and epithelial-to-mesenchymal transition seen in epiboly are recapitulated during cancer invasion and metastasis. Tumor cells often hijack similar molecular programs, including cadherin switching and Rho GTPase signaling, to spread to distant sites.
Regenerative Medicine Implications
Understanding epiboly mechanisms can inform strategies for wound healing and tissue engineering, where controlled cell sheet expansion is desired. For example, harnessing actomyosin dynamics could improve skin graft integration.
From epiboly involved in gastrulation with mouth forming second-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of gene X in epiboly? | CRISPR knockout in zebrafish or Xenopus |
| How does a specific mutation affect cell migration? | Point mutation knock-in in cell lines |
| Where is protein Y localized during epiboly? | Tagged knock-in (e.g., GFP) in deuterostome embryos |
| What happens when gene Z is overexpressed? | Overexpression via mRNA injection or transgenic lines |
| Which genes are essential for epiboly? | CRISPR library screening in embryonic stem cells |
| How do signaling pathways interact? | Bioinformatics analysis of transcriptomic data |
How to Study the epiboly involved in gastrulation with mouth forming second Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live imaging | Cell movement and shape | Tracking epiboly in zebrafish |
| RNA-seq | Transcript levels | Identifying differentially expressed genes |
| Proteomics | Protein abundance and modifications | Discovering signaling changes |
| CRISPR knockout | Gene function loss | Testing essentiality of candidate genes |
| CRISPR knock-in | Tagged protein localization | Visualizing cytoskeletal dynamics |
| Overexpression | Gain-of-function effects | Assessing sufficiency of a gene |
| Bioinformatics | Pathway enrichment | Integrating multi-omics data |
Live Imaging and Morphometrics
Time-lapse microscopy of fluorescently labeled cell membranes or nuclei allows tracking of cell movements and shape changes during epiboly. Quantitative morphometrics can measure tissue surface area, cell intercalation rates, and migration speed.
Transcriptomics and Spatial Profiling
RNA sequencing of microdissected embryonic regions at different epiboly stages reveals gene expression dynamics. Spatial transcriptomics can map the localization of transcripts within the spreading sheet.
Proteomics and Phosphoproteomics
Mass spectrometry-based proteomics identifies proteins and post-translational modifications that change during epiboly. This can uncover signaling nodes and cytoskeletal regulators.
Functional Perturbation via CRISPR
CRISPR-Cas9 knockout, knock-in, or overexpression constructs enable causal testing of candidate genes in deuterostome models. Pooled screens can identify novel regulators of epiboly.
How CRISPR Can Be Used to Study GO:0055113 epiboly involved in gastrulation with mouth forming second
Knockout
CRISPR knockout of candidate genes in deuterostome embryos (e.g., zebrafish, Xenopus) can reveal their requirement for epiboly. For example, knocking out actin regulators often results in arrested epiboly and embryonic lethality.
Point Mutation
Introducing specific point mutations via CRISPR base editing or homology-directed repair allows testing of phospho-mimetic or phospho-deficient variants of key proteins. This helps dissect signaling cascades controlling cell motility.
Knock-in
Knock-in of fluorescent tags (e.g., GFP) into endogenous loci enables real-time visualization of protein dynamics during epiboly. This is particularly useful for cytoskeletal and adhesion proteins.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression can test whether a gene is sufficient to drive or enhance epiboly movements. This approach can identify dominant-negative or gain-of-function phenotypes.
How EDITGENE Supports epiboly involved in gastrulation with mouth forming second Research
Researchers studying epiboly involved in gastrulation with mouth forming second-related genes often need to determine whether a candidate gene is causally involved in these morphogenetic movements. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate functional validation in deuterostome models and cell-based systems.
Contact EDITGENE today to design your custom CRISPR model for epiboly involved in gastrulation with mouth forming second research.
Frequently Asked Questions About epiboly involved in gastrulation with mouth forming second
What is epiboly involved in gastrulation with mouth forming second?
It is the expansion of one cell sheet over other cells during deuterostomic gastrulation, as defined by GO:0055113.
What genes are involved in epiboly involved in gastrulation with mouth forming second?
Key genes include actin, myosin, cadherins, Rho GTPases, and Wnt/FGF signaling components.
Why is epiboly important for embryonic development?
It ensures proper germ layer positioning and axis formation; defects can cause congenital anomalies.
How can I study epiboly in the lab?
Use live imaging, transcriptomics, proteomics, and CRISPR-based perturbations in deuterostome models.
What model organisms are used to study epiboly?
Zebrafish, Xenopus, and echinoderms are common deuterostome models.
What are the research methods for epiboly?
Methods include time-lapse microscopy, RNA-seq, proteomics, and CRISPR screens.
How does CRISPR help in understanding epiboly?
CRISPR enables knockout, knock-in, point mutation, and overexpression to test gene function.
What diseases are linked to epiboly defects?
Neural tube defects and cancer metastasis are associated with disrupted epiboly-like movements.
Can epiboly be studied in cell culture?
Yes, cell culture models can recapitulate aspects of collective cell migration and epithelial spreading.
What is the role of actin in epiboly?
Actin polymerization and actomyosin contractility drive cell shape changes and sheet spreading.
Conclusion
Epiboly involved in gastrulation with mouth forming second (GO:0055113) is a dynamic and essential process in deuterostome development, integrating cell signaling, adhesion, and mechanics. Its study offers insights into fundamental morphogenesis and human disease, and CRISPR technologies provide powerful tools for functional dissection. Continued research using advanced imaging and multi-omics will further unravel the complexity of this process.
References
- 1. Lyons DC et al.. 2015. Spiralian gastrulation: germ layer formation, morphogenesis, and fate of the blastopore in the slipper snail Crepidula fornicata.. Evodevo 6:24 PMID: 26664718
