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Vertebrate taste receptor cells express signaling molecules such as taste receptors and effectors to convert taste stimuli to inner cellular signals. Phospholipase C-beta2 (PLC-beta2) is an effector enzyme that is necessary to transduce taste signals in the mouse. It was shown that a subset of the plc-beta2 expressing cells also express taste receptor molecules, T1Rs or T2Rs, in mammals and fish. To label plc-beta2 expressing cells in the model fish species, we constructed a transgene by linking the 5'-upstream region of the medaka plc-beta2 gene to a green fluorescent protein (GFP) gene. The resulting transgenic medaka exhibited GFP signals in taste buds of the lips and the pharyngeal region. Detailed observation revealed that the GFP signals were in a subpopulation of taste bud cells, and co-localized with the transcript of endogenous plc-beta2 gene. Zebrafish introduced with the same transgene showed GFP signals in a subpopulation of taste bud cells of the lips and the pharyngeal region as in the case of medaka. This is the first report of successful labeling of taste receptor cells in two model fish species under the control of the plc-beta2 promoter. This promoter will be a useful genetic tool to study the vertebrate taste system in general.
Pubmed ID: 16920036 RIS Download
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View all literature mentionsTHIS RESOURCE IS NO LONGER IN SERVICE,documented on August 16, 2019. Fugu genome is among the smallest vertebrate genomes and has proved to be a valuable reference genome for identifying genes and other functional elements such as regulatory elements in the human and other vertebrate genomes, and for understanding the structure and evolution of vertebrate genomes. This site presents version 4 of the Fugu genome, released in October 2004 by the International Fugu Genome Consortium. Fugu rubripes has a very compact genome, with less than 15 consisting of dispersed repetitive sequence, which makes it ideal for gene discovery. A draft sequence of the fugu genome was determined by the International Fugu Genome Consortium in 2002 using the ''whole-genome shotgun'' sequencing strategy. Fugu is the second vertebrate genome to be sequenced, the first being the human genome. This webpage presents the annotation made on the fourth assembly by the IMCB team using the Ensembl annotation pipeline. We are continuing with the gap filling work and linking of the scaffolds to obtain super-contigs.
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