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Cautious use of fli1a:EGFP transgenic zebrafish in vascular research.

Biochem. Biophys. Res. Commun.2012 Oct 12;427(1):223-6. Epub 2012 Sep 17
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摘要


Integration of exogenous sequence into an intact genome may cause some artificial phenotype or unspecific observations. We noticed that there is unspecific vascular expression when using fli1a:EGFP transgenic embryos for whole-mount in situ hybridization (WISH) experiments. We therefore tested whether the residual vector sequence contained in the fli1a:EGFP transgene or the integration of transgene into the genome may cause this expression 'noise' and/or deregulation of gene expression at a genome-wide level. RNA probes were synthesized using two different methods, i.e. vector-based and PCR-based. The vector-based dnmt3 probe showed unspecific vascular expression in fli1a:EGFP embryos, but not in wildtype embryos, by WISH. Moreover, we also found that compared to that in wildtype, there were alterations in gene expression at whole-genome level in the fli1a:EGFP embryos. Our finding that the vector sequence contained in the fli1a:EGFP genome causes unspecific vascular expression by WISH and the genome-wide expression profiling is altered in fli1a:EGFP embryos strongly argue that extra caution should be taken for data interpretation when using transgenics, such as fli1a:EGFP, in developmental biology studies.

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