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Updated: Aug 17, 2026
The Power of Simplicity: Sea Urchin Embryos as in Vivo Developmental Models for Studying Complex Cell-to-cell Signaling Network Interactions
Published on: February 16, 2017
Characterization and expression of two matrix metalloproteinase genes during sea urchin development
Eric P Ingersoll1, Ninad C Pendharkar
1Department of Biology, Penn State University, Abington College, Abington, PA 19001, USA. epi1@psu.edu
Abstract:
Matrix metalloproteinases (MMPs) play an essential role in a variety of processes in development that require extracellular matrix remodeling and degradation. In this study, we characterize two MMPs from the sea urchin Strongylocentrotus purpuratus. These clones can both be identified as MMPs based on the presence of conserved domains such as the cysteine switch, zinc-binding, and hemopexin domains. In addition, both of these genes contain consensus furin cleavage sites and putative transmembrane domains, classifying them as membrane-type MMPs. We have named these clones SpMMP14 and SpMMP16 based on the vertebrate MMPs with which they share the greatest similarity. SpMMP14 is expressed in all cells from the egg to mesenchyme blastula stage embryo. Expression of this gene is strongest in the animal and vegetal poles early in gastrulation and in the animal pole only later in gastrulation. SpMMP16 is expressed at low levels in eggs. Expression of SpMMP16 becomes more pronounced in the vegetal pole region at the blastula and mesenchyme blastula stages and becomes confined to vegetal pole descendants, such as pigment cells, later in development. In the future, we hope to learn more about the possible functions of these genes in sea urchin development.
Insights
Researchers identified two new matrix metalloproteinases (MMPs), SpMMP14 and SpMMP16, in sea urchins. These membrane-type MMPs are crucial for early embryonic development and extracellular matrix remodeling.
Area of Science:
- Developmental Biology
- Molecular Biology
- Marine Biology
Background:
- Matrix metalloproteinases (MMPs) are essential enzymes involved in extracellular matrix remodeling during development.
- Understanding MMPs in marine invertebrates like sea urchins can provide insights into conserved developmental processes.
Purpose of the Study:
- To characterize two novel matrix metalloproteinases (MMPs) from the sea urchin Strongylocentrotus purpuratus.
- To investigate the expression patterns of these MMPs during early sea urchin development.
Main Methods:
- Bioinformatic analysis to identify conserved MMP domains (cysteine switch, zinc-binding, hemopexin).
- Identification of consensus furin cleavage sites and transmembrane domains to classify them as membrane-type MMPs.
- Whole mount in situ hybridization to determine gene expression patterns during embryonic development.
Main Results:
- Two membrane-type MMPs, designated SpMMP14 and SpMMP16, were identified and characterized based on conserved domains.
- SpMMP14 exhibits broad expression from egg to mesenchyme blastula, with specific localization in animal and vegetal poles during gastrulation.
- SpMMP16 shows low expression in eggs, increasing in the vegetal pole region during blastula stages and becoming restricted to vegetal pole descendants later in development.
Conclusions:
- SpMMP14 and SpMMP16 are identified as key regulators potentially involved in extracellular matrix dynamics during sea urchin embryogenesis.
- Differential expression patterns suggest distinct roles for SpMMP14 and SpMMP16 in specific developmental events and cell lineages.
- Further research is needed to elucidate the precise functions of these MMPs in sea urchin development.
