Biocompatibility of a genetically encoded calcium indicator in a transgenic mouse model

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Authors	DIRENBERGER Tephan MUES Marsilius MICALE Vincenzo WOTJAK Carsten T DIETZEL Steffen SCHUBERT Michael SCHARR Andreas HASSAN Sami WAHL-SCHOTT Christian BIEL Martin KRISHNAMOORTHY Gurumoorthy GRIESBECK Oliver
Year of publication	2012
Type	Article in Periodical
Magazine / Source	NATURE COMMUNICATIONS
MU Faculty or unit	Central European Institute of Technology
Citation
Web	http://www.nature.com/ncomms/journal/v3/n8/pdf/ncomms2035.pdf?WT.ec_id=NCOMMS-20120828
Doi	http://dx.doi.org/10.1038/ncomms2035
Field	Neurology, neurosurgery, neurosciences
Keywords	GREEN FLUORESCENT PROTEIN; TROPONIN-C; IN-VIVO; SINOATRIAL NODE; RESISTANCE ARTERIES; CA2+ INDICATORS; RHOA/RHO-KINASE; MICE; EXPRESSION; ACTIVATION
Description	Engineering efforts of genetically encoded calcium indicators predominantly focused on enhancing fluorescence changes, but how indicator expression affects the physiology of host organisms is often overlooked. Here, we demonstrate biocompatibility and widespread functional expression of the genetically encoded calcium indicator TN-XXL in a transgenic mouse model. To validate the model and characterize potential effects of indicator expression we assessed both indicator function and a variety of host parameters, such as anatomy, physiology, behaviour and gene expression profiles in these mice. We also demonstrate the usefulness of primary cells and organ explants prepared from these mice for imaging applications. Although we find mild signatures of indicator expression that may be further reduced in future sensor generations, the 'green' indicator mice generated provide a well-characterized resource of primary cells and tissues for in vitro and in vivo calcium imaging applications.