Brain-specific homeobox Bsx specifies identity of pineal gland between serially homologous photoreceptive organs in zebrafish

Hiroaki Mano, Yoichi Asaoka, Daisuke Kojima, Yoshitaka Fukada

Research output: Contribution to journalArticle

Abstract

The pineal gland functioning as a photoreceptive organ in non-mammalian species is a serial homolog of the retina. Here we found that Brain-specific homeobox (Bsx) is a key regulator conferring individuality on the pineal gland between the two serially homologous photoreceptive organs in zebrafish. Bsx knock-down impaired the pineal development with reduced expression of exorh, the pineal-specific gene responsible for the photoreception, whereas it induced ectopic expression of rho, a retina-specific gene, in the pineal gland. Bsx remarkably transactivated the exorh promoter in combination with Otx5, but not with Crx, through its binding to distinct subtypes of PIRE, a DNA cis-element driving Crx/Otx-dependent pineal-specific gene expression. These results demonstrate that the identity of pineal photoreceptive neurons is determined by the combinatorial code of Bsx and Otx5, the former confers the pineal specificity at the tissue level and the latter determines the photoreceptor specificity at the cellular level.

Original languageEnglish
Article number364
JournalCommunications Biology
Volume2
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

pineal body
Pineal Gland
Homeobox Genes
Zebrafish
Danio rerio
Brain
brain
retina
Retina
Genes
Organ Specificity
photoreceptors
Gene expression
Individuality
Neurons
genes
neurons
promoter regions
Tissue
Gene Expression

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • Medicine (miscellaneous)

Cite this

Brain-specific homeobox Bsx specifies identity of pineal gland between serially homologous photoreceptive organs in zebrafish. / Mano, Hiroaki; Asaoka, Yoichi; Kojima, Daisuke; Fukada, Yoshitaka.

In: Communications Biology, Vol. 2, No. 1, 364, 01.12.2019.

Research output: Contribution to journalArticle

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