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Abstract
Hatching is a critical event in the life history of oviparous species. The decision to hatch is often carefully timed to coincide with favorable conditions that will improve survival through early life stages. However, how the relevant cues are relayed to trigger hatching remains unknown. In this work, we show that thyrotropin-releasing hormone (Trh) is the neuroendocrine activator of hatching in zebrafish. To elicit hatching, Trh neurons form a transient circuit that deposits the peptide into the embryo's circulation. Trh also activates hatching in a distantly related fish species that separated more than 200 million years ago. Our results reveal an evolutionarily conserved neuroendocrine circuit that controls a major life event in oviparous fish species.
Published Version
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