[Zbrafish] Stability of zebrafish GFP transgenics

Chi-Bin Chien via zbrafish%40net.bio.net (by chi-bin.chien from neuro.utah.edu)
Thu Oct 28 13:47:00 EST 2010

Hi Alice,

Unfortunately this kind of silencing seems to be relatively common for  
transgenics; its cause is likely epigenetic (e.g. methylation), and  
may vary in degree depending on the construct and insertion site. See  
for instance Goll et al. (2009) Genetics 182:747-55.

The good news is, since it's epigenetic it is partly heritable. If you  
do select the brightest embryos at every generation (as we do), you  
can maintain most lines in good shape for many generations.

Chi-Bin Chien

< Dept. Neurobiology and Anatomy |       office: 1-801-585-1701 >
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On Oct 28, 2010, at 4:59 AM, Shia, Alice K H wrote:

> Hi all,
> We have something weird going on in our lab at the moment.  
> Homozygous transgenic lines have started to lose their gfp signal or  
> some of the lines have become more and more heterogenous in their  
> gfp expression in embryos.
> Does everyone select their rearing embryos at every generation?  
> These are published lines and were fine when we started using them.  
> Some have been reared for 2-3 generations (inbreeding cross) and  
> some have been outcrossed and reselected. The lines have arrived  
> from different labs.
> Any advice would be helpful.
> Many thanks
> Alice shia
> <ATT00001..txt>

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