Generation of an inducible tissue-specific Atoh1 transgenic mouse line

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Generation of an inducible tissue-specific Atoh1 transgenic mouse line. Generation of an inducible tissue-specific Atoh1 transgenic mouse line. A, Schematic diagram of the triallelic TgAtoh1 mouse line. When crossed to a Cre mouse line, expression of rtTA (and an eGFP reporter) is tissue specific, determined by Cre recombinase-mediated excision of an upstream stop cassette. Expression of TgAtoh1 is regulated by TRE, which is activated when rtTA is bound to Dox. Restriction enzyme sites and the probe location for Southern blot are shown. B, As confirmed by Southern blot analysis using an Atoh1 probe, four transgenic founders carry TgAtoh1. Compared with the endogenous Atoh1 DNA fragment (2.9 kb), line 3 is estimated to have 2–3 copies of the TgAtoh1 transgene (1.6 kb). C, The expression of eGFP and, presumably, rtTA is ubiquitous in cochlear epithelial cells (marked with dotted lines) when the Foxg1Cre line is used to generate triallelic TgAtoh1 animals or Foxg1Cre;rtTA;TgAtoh1 animals. Scale bar, 20 μm. D, After 2 d of Dox administration, only in animals carrying TgAtoh1 and alleles for Foxg1Cre and rtTA, the Atoh1 transcript is highly upregulated in the cochlear epithelium as shown with RT-PCR. IRES, Internal ribosome entry site. Michael C. Kelly et al. J. Neurosci. 2012;32:6699-6710 ©2012 by Society for Neuroscience