Changes in Olfactory Receptor Expression Are Correlated With Odor Exposure During Early Development in the zebrafish (Danio rerio)

Chemical Senses
Cristian CalfúnKathleen E Whitlock

Abstract

We have previously shown that exposure to phenyl ethyl alcohol (PEA) causes an increase in the expression of the transcription factor otx2 in the olfactory epithelium (OE) of juvenile zebrafish, and this change is correlated with the formation of an odor memory of PEA. Here, we show that the changes in otx2 expression are specific to βPEA: exposure to αPEA did not affect otx2 expression. We identified 34 olfactory receptors (ORs) representing 16 families on 4 different chromosomes as candidates for direct regulation of OR expression via Otx2. Subsequent in silico analysis uncovered Hnf3b binding sites closely associated with Otx2 binding sites in the regions flanking the ORs. Analysis by quantitative polymerase chain reaction and RNA-seq of OR expression in developing zebrafish exposed to different isoforms of PEA showed that a subset of ORs containing both Otx2/Hnf3b binding sites were downregulated only in βPEA-exposed juveniles and this change persisted through adult life. Localization of OR expression by in situ hybridization indicates the downregulation occurs at the level of RNA and not the number of cells expressing a given receptor. Finally, analysis of immediate early gene expression in the OE did not reveal changes in...Continue Reading

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Citations

Apr 17, 2018·Journal of Fish Biology·N N BettK M Miller
Oct 27, 2017·Fish Physiology and Biochemistry·Raul CortésJosé Miguel Cerdá-Reverter
Feb 8, 2019·The Journal of Experimental Biology·Gabriele GerlachAstrid Sulmann
Feb 5, 2021·Frontiers in Cell and Developmental Biology·M Fernanda Palominos, Kathleen E Whitlock

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