On July 6, 2026, biologists revealed that young sea stars offer a unique perspective on how embryonic tubes evolve into complex organs. Researchers at the Marine Biological Laboratory, led by Margherita Perillo, have identified a tubular structure called the hydrovascular organ (HVO) in the larval stages of the Forbes sea star, Asterias forbesi.
Understanding the Hydrovascular Organ in Sea Stars
The hydrovascular organ (HVO) is a hollow tube that forms during the larval stage of sea stars, expanding like a balloon within their body cavities. This structure is essential as it acts as a precursor to the more complex organs that develop later. Perillo's team emphasizes that the HVO shares similarities with certain human organs, such as the heart, lungs, and kidneys, which also begin their development as simple tubes.
Perillo stated, "Sea stars form embryonic organs like vertebrates do," highlighting the significance of this research. The transparent nature of sea star eggs and larvae allows for detailed observation of their development processes, making them an ideal subject for studying organ formation.
Comparative Development of Hydrovascular Organs Across Species
By examining different species of sea stars, including the Forbes sea star, bat sea star, and red comb sea star, researchers are uncovering the varied developmental pathways of the HVO. Each species exhibits unique characteristics in how their HVOs form:
- Forbes sea stars: Tubes grow toward the stomach and merge over the mouth.
- Bat sea stars: Initial tubular connections form early, followed by growth toward the stomach.
- Red comb sea stars: Tubes merge near the intestine first.
Despite these differences, all studied sea stars ultimately develop similarly shaped HVOs. This comparative analysis is crucial for understanding how organ development occurs across different species.
The Future of Organ Development Research
Following their foundational research on HVO formation, Perillo and her team are poised to explore several key questions. They aim to understand how organs form from these initial tubes, maintain their proper orientation and shape, and how to prevent fibrosis in mature organs. This research could have broader implications for regenerative medicine and developmental biology.
By revealing the transformation of a simple tube into a functional organ, the study of the hydrovascular organ in sea stars presents a significant opportunity to investigate fundamental biological processes that may apply across various species.
For further details, refer to the study published in Discover Developmental Biology by Talia Kathleen Marc et al.
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