Generation of a transgenic zebrafish model of Tauopathy using a novel promoter element derived from the zebrafish eno2 gene

Q Bai, JA Garver, NA Hukriede… - Nucleic acids …, 2007 - academic.oup.com
Q Bai, JA Garver, NA Hukriede, EA Burton
Nucleic acids research, 2007academic.oup.com
The aim of this study was to isolate cis-acting regulatory elements for the generation of
transgenic zebrafish models of neurodegeneration. Zebrafish enolase-2 (eno2) showed
neuronal expression increasing from 24 to 72 h post-fertilization (hpf) and persisting through
adulthood. A 12 kb eno2 genomic fragment, extending from 8 kb upstream of exon 1 to exon
2, encompassing intron 1, was sufficient to drive neuronal reporter gene expression in vivo
over a similar time course. Five independent lines of stable Tg (eno2: GFP) zebrafish …
Abstract
The aim of this study was to isolate cis -acting regulatory elements for the generation of transgenic zebrafish models of neurodegeneration. Zebrafish enolase-2 ( eno2 ) showed neuronal expression increasing from 24 to 72 h post-fertilization (hpf) and persisting through adulthood. A 12 kb eno2 genomic fragment, extending from 8 kb upstream of exon 1 to exon 2, encompassing intron 1, was sufficient to drive neuronal reporter gene expression in vivo over a similar time course. Five independent lines of stable Tg( eno2 : GFP ) zebrafish expressed GFP widely in neurons, including populations with relevance to neurodegeneration, such as cholinergic neurons, dopaminergic neurons and cerebellar Purkinje cells. We replaced the exon 2-GFP fusion gene with a cDNA encoding the 4-repeat isoform of the human microtubule-associated protein Tau. The first intron of eno2 was spliced with high fidelity and efficiency from the chimeric eno2-Tau transcript. Tau was expressed at 8-fold higher levels in Tg( eno2 : Tau ) zebrafish brain than normal human brain, and localized to axons, neuropil and ectopic neuronal somatic accumulations resembling neurofibrillary tangles. The 12 kb eno2 promoter drives high-level transgene expression in differentiated neurons throughout the CNS of stable transgenic zebrafish. This regulatory element will be useful for the construction of transgenic zebrafish models of neurodegeneration.
Oxford University Press