Fig. 1. Insufficient rate of recombination in NSCs and NPCs of Nestin-cre transgenic mice.(A) Breeding schemes to generate Nestin-cre transgenic mice (Jax:

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Presentation transcript:

Fig. 1. Insufficient rate of recombination in NSCs and NPCs of Nestin-cre transgenic mice.(A) Breeding schemes to generate Nestin-cre transgenic mice (Jax: B6.Cg-Tg(Nes-cre)1 Kln/J) on either a LacZ or tdTomato (tdTom) reporter background. Insufficient rate of recombination in NSCs and NPCs of Nestin-cre transgenic mice.(A) Breeding schemes to generate Nestin-cre transgenic mice (Jax: B6.Cg-Tg(Nes-cre)1 Kln/J) on either a LacZ or tdTomato (tdTom) reporter background. LacZ or tdTom are conditionally expressed under the chicken β-actin promoter, which was knocked into the Rosa locus to track cre-mediated recombination. Two loxP sites flank a STOP codon upstream of the reporter cassettes, preventing reporter expression in the absence of cre-mediated recombination. Nestin-cre mediated recombination deletes the stop codon allowing the expression of the reporters. (B) Sagittal views of the developing CNS illustrating tdTom reporter expression mediated by Nestin-cre at embryonic stages E12.5, E14.5, and at birth (P0). (C) Analysis of cre expression at ages corresponding to sections in B, using a cre-specific antibody (green), in combination with tdTom and DAPI (blue). Cre(−) controls were obtained from brains of mice negative for Nestin-cre, but genetically positive for tdTom reporter. (D) Laminar pattern of Nestin-cre mediated recombination in NSCs and NPCs reported by LacZ expression in the E12.5 cerebral cortex. LacZ was predominantly expressed in the preplate (PPL), which consists of postmitotic cells, but not in the VZ, which consists of cycling NSCs. Similar pattern of expression was observed in the E14.5 lateral ganglionic eminence (LGE), olfactory ventricular zone (OV), and the cerebral cortices (Ctx). Each region is depicted in high magnification images of boxed regions marked in 1B. At E14.5, recombined tdTom+ cells in the VZ and SVZ (red, arrows) largely fail to co-label with the markers of cycling NSCs and NPCs in all three regions (PH3, green; BrdU, blue). Recombination in the E14.5 Ctx was dense in the intermediate zone (IZ) and the cortical plate (CP), which largely consists of post-mitotic neurons (MZ, marginal zone; devoid of recombined cells). (E) The rate of Nestin-cre mediated recombination in NSCs and NPCs reaches high levels at P0, revealed by expression of tdTom in nearly all cells (TO-PRO+, blue) and BrdU immunoreactive progenitors (green; arrows) of the subependymal zone (SEZ) and the rostral migratory stream (RMS). Scale bars: B, 500 µm; C, 30 µm; D, 40 µm; E, 20 µm. Huixuan Liang et al. Biology Open 2012;bio.20122287 © 2012. Published by The Company of Biologists Ltd