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Abstract:

Seahorses, renowned for their unique reproductive strategy, exhibit a remarkable role reversal, with males carrying and giving birth to offspring. This process involves the formation of a specialized brood pouch, an intricate yet poorly understood structure. Our study unravels the molecular mechanisms underlying brood pouch development and pregnancy in male seahorses. We identify retinoic acid signaling as a key regulator of these processes.

Using a combination of gene expression analysis, in vitro experiments, and pharmacological approaches, we demonstrate that retinoic acid signaling is essential for the initiation and maintenance of brood pouch formation. We show that retinoic acid induces the expression of genes involved in tissue remodeling, cell migration, and the formation of blood vessels, processes critical for the development of the brood pouch.

Moreover, retinoic acid signaling plays a crucial role in maintaining the integrity of the brood pouch during pregnancy. We found that retinoic acid levels fluctuate during gestation, with peaks corresponding to specific stages of embryonic development. These fluctuations regulate the expression of genes involved in immune response and tissue repair, ensuring the health and protection of the developing embryos within the brood pouch.

Our findings highlight the significance of retinoic acid signaling in the reproductive biology of male seahorses. This study not only provides novel insights into the molecular regulation of brood pouch formation and pregnancy but also opens avenues for further research on the evolutionary and conservation implications of this remarkable reproductive adaptation.

Keywords: Seahorse, Brood pouch, Pregnancy, Retinoic acid, Gene expression, Molecular regulation, Reproduction, Evolution, Conservation.