GO:0001702 gastrulation with mouth forming second: Deuterostome Development, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0001702 (gastrulation with mouth forming second) describes deuterostomic gastrulation, in which the initial invagination becomes the anus and the mouth forms secondarily.
• The process is defined by blastopore fate: the blastopore gives rise to the anus, and the mouth arises from a separate opening, a hallmark of deuterostomes.
• Key cellular events include germ layer formation, archenteron invagination, and septate junction remodeling during morphogenesis [2,4].
• Comparative embryology across spiralians, cnidarians, and echinoderms reveals conserved and divergent mechanisms of blastopore fate [2,3,4].
• Disruption of gastrulation-stage morphogenesis can underlie developmental anomalies, though direct human disease links remain an active area of research.
• CRISPR-based models (knockout, knock-in, overexpression) enable functional interrogation of genes controlling mouth-forming gastrulation [1,2].
Description
Gastrulation with mouth forming second (GO:0001702) is the biological process by which a deuterostome embryo forms its germ layers and establishes the mouth as a secondary opening, while the initial invagination becomes the anus. This mode of gastrulation, also called deuterostomic gastrulation, contrasts with protostomic development and is central to understanding the evolutionary diversification of animal body plans. The term captures a defining feature of deuterostome embryology: the blastopore does not become the mouth but instead contributes to the anus, and the mouth forms later from a separate region. Researchers study this process to dissect the molecular and cellular mechanisms that pattern the early embryo, including germ layer specification, archenteron formation, and junctional remodeling [2,4]. Comparative studies in spiralians, cnidarians, and echinoderms have illuminated conserved and lineage-specific features of blastopore fate and mouth formation [2,3,4]. Because gastrulation is a critical window for developmental robustness, understanding GO:0001702 provides insight into both normal embryogenesis and the origins of developmental anomalies.
gastrulation with mouth forming second At A Glance
| GO ID | GO:0001702 |
|---|---|
| GO term | gastrulation with mouth forming second |
| Ontology | biological_process |
| Synonym | deuterostomic gastrulation |
| Definition | A gastrulation process in which the initial invagination becomes the anus and the mouth forms second. |
| Major function | Establishment of germ layers and secondary mouth formation during deuterostome embryogenesis. |
| Related processes | Germ layer formation, archenteron invagination, blastopore fate specification, septate junction remodeling. |
| Taxonomic scope | Deuterostomes, with comparative data from spiralians and cnidarians. |
What Is GO:0001702?
GO:0001702 is defined as a gastrulation process in which the initial invagination becomes the anus and the mouth forms second. In this deuterostomic mode, the blastopore (the opening of the archenteron) gives rise to the anus, and the mouth arises secondarily from a distinct site. This definition distinguishes it from protostomic gastrulation, where the blastopore becomes the mouth. The term encompasses the coordinated cell movements, germ layer formation, and morphogenetic events that establish the deuterostome body plan [1,2].
Why Is gastrulation with mouth forming second Important in Cell Biology?
GO:0001702 is important because it defines a fundamental developmental strategy that shapes the deuterostome body plan, including humans. Understanding how the blastopore becomes the anus and the mouth forms secondarily provides a framework for studying germ layer specification, axis patterning, and epithelial morphogenesis [1,2]. Comparative analyses across spiralians, cnidarians, and echinoderms reveal how evolutionary changes in blastopore fate contribute to animal diversity [2,3,4]. Moreover, disruptions in gastrulation-stage processes can lead to developmental defects, making this term relevant to developmental biology and regenerative medicine.
• Defines deuterostome embryogenesis, including vertebrates.
• Provides a model for studying germ layer formation and axis patterning.
• Illuminates evolutionary transitions in blastopore fate [2,3].
• Involves septate junction dynamics relevant to epithelial morphogenesis.
• Serves as a framework for understanding developmental anomalies.
• Enables comparative studies across spiralians, cnidarians, and echinoderms [2,3,4].
• Guides functional genomics of mouth-forming genes.
• Supports CRISPR-based modeling of gastrulation genes [1,2].
What Happens During gastrulation with mouth forming second?
Blastopore fate and germ layer formation
In simple terms: The opening that forms early in the embryo becomes the anus, not the mouth.
In deuterostomic gastrulation, the blastopore is specified to become the anus, while the mouth forms secondarily. This fate decision is accompanied by the formation of the three germ layers (ectoderm, mesoderm, and endoderm) through coordinated cell movements [1,2]. Studies in the slipper snail Crepidula fornicata show that germ layer formation and blastopore fate are tightly linked to morphogenetic movements.
Archenteron invagination and mouth formation
In simple terms: The gut cavity forms by inward folding, and the mouth opens later at a different site.
The archenteron invaginates from the blastopore, establishing the primitive gut. In deuterostomes, the mouth does not arise from this opening; instead, it forms secondarily from a separate region of the ectoderm. This secondary mouth formation is a defining feature of GO:0001702 and has been studied in echinoderms and other deuterostomes [1,4].
Septate junction remodeling during gastrulation
In simple terms: Cell junctions are reorganized as the embryo changes shape.
Septate junctions, which are epithelial cell-cell junctions, undergo dynamic changes during gastrulation. In sea urchin embryos, the coincident time-space patterns of septate junction development have been documented in normal and exogastrulated embryos, suggesting a role in maintaining epithelial integrity during morphogenesis. These junctional changes are essential for the coordinated cell movements of gastrulation.
Comparative patterns in spiralians and cnidarians
In simple terms: Different animal groups show variations on how the mouth and anus form.
Spiralian gastrulation in Crepidula fornicata reveals that blastopore fate and germ layer formation can vary, providing evolutionary context for deuterostomic gastrulation. In the cnidarian Palythoa tuberculosa, early development and spawning timing have been described, offering insights into the diversity of gastrulation strategies. These comparative studies highlight both conserved and divergent features of mouth-forming gastrulation [2,3].
Key Genes Involved in GO:0001702 gastrulation with mouth forming second
The following genes and proteins have been implicated in gastrulation with mouth forming second and related morphogenetic processes based on the cited literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Brachyury | Mesoderm specification and archenteron formation | Marker of gastrulation in deuterostomes |
| FoxA | Endoderm and mouth formation | Studied in deuterostome mouth development |
| Snail | Epithelial-mesenchymal transition during gastrulation | Conserved regulator of gastrulation movements |
| Wnt | Axis patterning and blastopore fate | Key signaling pathway in gastrulation |
| FGF | Mesoderm induction and cell migration | Involved in archenteron formation |
| Nodal | Germ layer specification | Critical for endoderm and mesoderm |
| E-cadherin | Epithelial adhesion during morphogenesis | Dynamic regulation during gastrulation |
| Septate junction proteins | Epithelial barrier and cell polarity | Remodeled during gastrulation |
| Otx | Anterior patterning and mouth formation | Studied in deuterostome embryos |
| Pax | Neural and ectodermal patterning | Relevant to mouth-forming regions |
| Hox | Anteroposterior patterning | Downstream of gastrulation signals |
| Sox | Neural and endoderm specification | Involved in germ layer formation |
| GATA | Endoderm and mesoderm differentiation | Regulates archenteron development |
| TGF-beta | Signaling in germ layer formation | Conserved in deuterostomes |
| Delta/Notch | Cell fate specification during gastrulation | Studied in spiralians |
| Actin | Cell shape changes and invagination | Cytoskeletal driver of morphogenesis |
| Myosin | Apical constriction during invagination | Required for archenteron formation |
How Is gastrulation with mouth forming second Regulated?
Gastrulation with mouth forming second is regulated by conserved signaling pathways, including Wnt, FGF, Nodal, and TGF-beta, which pattern the germ layers and specify blastopore fate [1,2]. In spiralians, these pathways interact with maternal determinants to control cell movements and fate decisions. Septate junction remodeling is also regulated during gastrulation, contributing to epithelial integrity and morphogenesis. Comparative studies suggest that evolutionary changes in these regulatory networks underlie differences in blastopore fate among metazoans [2,3].
gastrulation with mouth forming second and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| Brachyury | Developmental anomalies | Knockout in deuterostome models |
| FoxA | Mouth and endoderm defects | Knock-in reporter |
| Snail | Epithelial-mesenchymal transition defects | Overexpression |
| E-cadherin | Epithelial integrity defects | Point mutation |
| Septate junction proteins | Epithelial barrier dysfunction | Knockout |
Developmental anomalies and gastrulation defects
Disruptions in gastrulation-stage processes, including those governing mouth formation, can lead to developmental anomalies. While direct human disease associations with GO:0001702 are not well established, the process is fundamental to embryogenesis and its perturbation may contribute to congenital defects.
Evolutionary and comparative disease relevance
Comparative studies of gastrulation in spiralians and cnidarians provide insights into the evolutionary origins of developmental mechanisms that, when disrupted, may be linked to human conditions [2,3]. However, direct disease links remain speculative and require further research.
From gastrulation with mouth forming second-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the role of a candidate gene in blastopore fate? | Knockout in deuterostome embryos |
| How does a specific mutation affect mouth formation? | Point mutation knock-in |
| Where is a protein expressed during gastrulation? | Tagged knock-in |
| Does overexpression of a gene alter germ layer formation? | Overexpression |
| How do septate junctions remodel during gastrulation? | Knockout of junctional proteins |
| What are the evolutionary conserved regulators? | Comparative knockout in spiralians |
How to Study the gastrulation with mouth forming second Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Live imaging | Cell movements and morphogenesis | Gastrulation dynamics |
| RNA-seq | Gene expression profiles | Comparative gastrulation |
| CRISPR knockout | Gene function loss | Candidate gene testing |
| CRISPR knock-in | Protein localization and tagging | Gene expression analysis |
| Immunostaining | Protein localization | Junction and germ layer markers |
| Electron microscopy | Ultrastructure of junctions | Septate junction development |
| Exogastrulation | Morphogenetic defects | Junction remodeling studies |
Embryological manipulation and imaging
Classical embryological techniques, including exogastrulation and live imaging, have been used to study septate junction dynamics during gastrulation. These methods allow direct observation of morphogenetic movements and junctional remodeling.
Comparative transcriptomics
RNA sequencing across deuterostome and spiralian embryos can identify conserved and divergent gene expression programs during gastrulation. Such studies help pinpoint regulators of blastopore fate and mouth formation.
Functional perturbation with CRISPR
CRISPR-based knockout and knock-in approaches enable functional testing of candidate genes in gastrulation models. These methods are essential for establishing causality between gene function and mouth-forming gastrulation.
Junctional protein analysis
Immunostaining and electron microscopy have been used to track septate junction development in normal and exogastrulated sea urchin embryos. These techniques reveal the time-space patterns of junctional assembly.
How CRISPR Can Be Used to Study GO:0001702 gastrulation with mouth forming second
Knockout
CRISPR knockout of genes such as Brachyury or FoxA can reveal their requirement for blastopore fate and mouth formation in deuterostome models. Knockout approaches are essential for loss-of-function studies during gastrulation.
Point Mutation
Introducing precise point mutations in genes like E-cadherin allows testing of specific residues in epithelial adhesion during gastrulation. Such models help dissect molecular mechanisms of junctional remodeling.
Knock-in
Knock-in of fluorescent tags into gastrulation genes enables live tracking of protein localization and dynamics. This approach is valuable for understanding mouth-forming morphogenesis.
Overexpression
Overexpression of signaling components such as Wnt or FGF can perturb germ layer formation and blastopore fate, providing gain-of-function insights. These models complement knockout studies.
How EDITGENE Supports gastrulation with mouth forming second Research
Researchers studying gastrulation with mouth forming second-related genes often need to determine whether a candidate gene is causally involved in blastopore fate, germ layer formation, or mouth development. EDITGENE provides comprehensive CRISPR services to accelerate this functional validation.
Contact EDITGENE today to design your custom CRISPR model for gastrulation with mouth forming second research.
Frequently Asked Questions About gastrulation with mouth forming second
What is gastrulation with mouth forming second?
It is a deuterostomic gastrulation process in which the initial invagination becomes the anus and the mouth forms second.
What is the GO ID for gastrulation with mouth forming second?
The GO ID is GO:0001702.
What genes are involved in gastrulation with mouth forming second?
Genes such as Brachyury, FoxA, Snail, and Wnt are implicated in germ layer formation and mouth development [1,2].
What is another name for gastrulation with mouth forming second?
It is also called deuterostomic gastrulation.
How is gastrulation with mouth forming second studied?
Researchers use embryological manipulation, imaging, transcriptomics, and CRISPR-based functional perturbation [1,2,4].
What happens to the blastopore in deuterostomic gastrulation?
The blastopore becomes the anus, and the mouth forms secondarily.
Is gastrulation with mouth forming second conserved across animals?
Comparative studies show both conserved and divergent features across deuterostomes, spiralians, and cnidarians [2,3].
What role do septate junctions play in gastrulation?
Septate junctions are remodeled during gastrulation and contribute to epithelial integrity.
Can CRISPR be used to study gastrulation with mouth forming second?
Yes, CRISPR knockout, knock-in, and overexpression models enable functional studies of genes involved in this process [1,2].
What diseases are linked to gastrulation with mouth forming second?
Direct disease links are not well established, but disruptions in gastrulation can contribute to developmental anomalies.
Conclusion
GO:0001702 (gastrulation with mouth forming second) defines a fundamental deuterostome developmental process in which the blastopore becomes the anus and the mouth forms secondarily. Comparative and functional studies across diverse metazoans continue to reveal the molecular and cellular mechanisms underlying this process [2,3,4]. Understanding these mechanisms is essential for developmental biology and for interpreting the evolutionary origins of body plans [1,2].
References
- 1. Soukup V et al.. 2013. Development and evolution of the vertebrate primary mouth.. J Anat 222(1):79-99 PMID: 22804777
- 2. 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
- 3. Hirose M et al.. 2011. Timing of spawning and early development of Palythoa tuberculosa (Anthozoa, Zoantharia, Sphenopidae) in Okinawa, Japan.. Biol Bull 220(1):23-31 PMID: 21385954
- 4. Spiegel E et al.. 1985. The coincident time-space patterns of septate junction development in normal and exogastrulated sea urchin embryos.. Exp Cell Res 161(1):75-87 PMID: 4054236
