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Mid-facial developmental defects caused by the widely used LacZ reporter gene when expressed in neural crest-derived cells.
Transgenic Research 2018 December
Reporter genes play important roles in transgenic research. LacZ is a widely used reporter gene that encodes Escherichia coli β-galactosidase, an enzyme that is well known for its ability to hydrolyze X-gal into a blue product. It is unknown whether transgenic LacZ has any adverse effects. R26R reporter mice, containing a LacZ reporter gene, were generated to monitor the in vivo recombination activity of various transgenic Cre recombinase via X-gal staining. P0-Cre is expressed in neural crest-derived cells, which give rise to the majority of the craniofacial bones. Herein, we report that 12% of the R26R reporter mice harboring P0-Cre had unexpected mid-facial developmental defects manifested by the asymmetrical growth of some facial bones, thus resulting in tilted mid-facial structure, shorter skull length, and malocclusion. Histological examination showed a disorganization of the frontomaxillary suture, which may at least partly explain the morphological defect in affected transgenic mice. Our data calls for the consideration of the potential in vivo adverse effects caused by transgenic β-galactosidase.
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