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Journal Article
Research Support, Non-U.S. Gov't
Bsx controls pineal complex development.
Development 2018 July 10
Neuroendocrine cells in the pineal gland release melatonin during the night and, in teleosts, are directly photoreceptive. During development of the pineal complex, a small number of cells migrate leftward away from the pineal anlage to form the parapineal cell cluster, a process that is crucial for asymmetrical development of the bilateral habenular nuclei. Here, we show that, throughout zebrafish embryonic development, the brain-specific homeobox ( bsx ) gene is expressed in all cell types of the pineal complex. We identified Bmp and Noto/Flh as major regulators of bsx expression in the pineal complex. Upon loss of Bsx through the generation of a targeted mutation, embryos fail to form a parapineal organ and develop right-isomerized habenulae. Crucial enzymes in the melatonin biosynthesis pathway are not expressed, suggesting the absence of melatonin from the pineal gland in bsx mutants. Several genes involved in rod-like or cone-like phototransduction are also abnormally expressed, indicating that Bsx has a pivotal role in the differentiation of multiple cell types in the zebrafish pineal complex.
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