Volume 86, Issue 4, Pages (May 2015)

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Volume 86, Issue 4, Pages 1100-1108 (May 2015) Cux2-Positive Radial Glial Cells Generate Diverse Subtypes of Neocortical Projection Neurons and Macroglia  Matthew J. Eckler, Ton D. Nguyen, William L. McKenna, Ben L. Fastow, Chao Guo, John L.R. Rubenstein, Bin Chen  Neuron  Volume 86, Issue 4, Pages 1100-1108 (May 2015) DOI: 10.1016/j.neuron.2015.04.020 Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 1 Individual E10.5 Cux2+ RGCs Generate Cortical Projection Neurons and Macroglia Located throughout Cortical Layers 2–6 (A) The constitutive activity of the Cre recombinase makes the Cux2-Cre allele unsuitable for lineage analysis of neocortical RGCs. (B) Experimental methodology for lineage analysis of Cux2+ RGCs using the Cux2-CreERT2 allele. (C and D) Examples of TM at E10.5, P10 Cux2+ RGC clones. For each clone, a lower-magnification image is shown first to illustrate the position of the clone in the cerebral cortex, followed by higher-magnification images of serial sections that span the entire clone. (C1), (C2), and (C3) show neurons, an astrocyte, and an oligodendrocyte found within the clone shown in (C). (E) Scatter plot of the number of cells for each of the 43 clones analyzed. (F) Quantification of the percentages of neurons and glia generated from E10.5 Cux2+ RGCs based upon the analysis of 43 fully reconstructed clones. (G) Quantification of the percentages of all lineage-traced cells, neurons, and glia that were located in deep or upper layers. Abbreviations: CR, Cajal-Retzius cells; Ctx, cerebral cortex; DL, deep cortical layers (layers 5 and 6); Hip, hippocampus; UL, upper cortical layers (layers 2–4). Scale bars represent 500 μm in (C) and (D) and 250 μm in Inserts. Neuron 2015 86, 1100-1108DOI: (10.1016/j.neuron.2015.04.020) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 2 Cux2+ RGCs Generate Diverse, Molecularly Defined Subtypes of Cortical Projection Neurons and Macroglia All images are of brain sections from P10 Cux2-CreERT2; Ai9 (A–T) or P10 Cux2-CreERT2; RCE-GFP (U–Z) mice that received a single tamoxifen injection at E10.5 (TM at E10.5; P10). Lineage-traced neurons expressed TBR1 (A–E), DARPP32 (F–J), SATB2 (K–O), CUX1 (P–T), or CTIP2 (A–T). (B)–(E), (G)–(J), (L)–(O), and (Q)–(T) show the higher-magnification images of the boxed areas in (A), (F), (K), and (P), respectively. The arrowheads in (B)–(E), (G)–(J), (L)–(O), and (Q)–(T) point to cells that are shown in higher magnification to the right. (U–Z) E10.5 lineage-traced Cux2+ RGCs generated astrocytes that expressed GFAP (U–W) and oligodendrocytes that expressed OLIG2 (X–Z). (AA) Percentages of lineage-traced deep layer and upper layer neurons that expressed the indicated markers. Error bars represent SD. Abbreviations: Ctx, cerebral cortex; Hip, hippocampus. Scale bars represent 500 μm in (A), (F), (K), and (P), 100 μm in (E), (J), (O), and (T), and 25 μm in (W) and (Z). Neuron 2015 86, 1100-1108DOI: (10.1016/j.neuron.2015.04.020) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 3 Similar to Early Cux2+ RGCs, E10.5 Fezf2+ RGCs Generate Diverse Subtypes of Cortical Projection Neurons and Glia (A) Experimental methodology. (B–C) Two examples of clones generated from E10.5 Fezf2+ RGCs. For each clone, a lower-magnification image is shown first to illustrate the position of the clone in the cerebral cortex, followed by higher-magnification images of serial sections that span the full clone. (D) Scatter plot of the number of cells for each of the 46 clones analyzed. (E) Quantification of the percentages of lineage-traced cells that were neurons or glia. (F) Quantification of the percentages of lineage-traced cells, neurons, and glia that were located in deep and upper cortical layers. (G) Percentages of lineage-traced deep layer and upper layer neurons that expressed the indicated markers. (H) Percentages of deep layer neurons generated from E10.5 Cux2+ or E10.5 Fezf2+ RGCs that expressed combinations of either CTIP2/TBR1 or CTIP2/SATB2. Error bars represent SD. Abbreviations: Ctx, cerebral cortex; Hip, hippocampus; LV, lateral ventricle. Scale bars represent 500 μm in (A), (B), and (C), and 250 μm in Inserts. Neuron 2015 86, 1100-1108DOI: (10.1016/j.neuron.2015.04.020) Copyright © 2015 Elsevier Inc. Terms and Conditions

Figure 4 Retrograde Labeling of the Cux2+ and Fezf2+ Lineages (A) Experimental setup. (B) Percentages of GFP+ cells in layer 5 or in layers 5 and 6 that are also Ctß positive. Error bars represent SD (n = 2 brains for Cux2 and 6 brains for Fezf2). (C–F) Example of brain sections from Cux2-CreERT2; RCE-GFP mice that received TM at E10.5 and were injected with Ctß at P8. Note the dense band of Ctß labeling in layer 5. (D)–(F) show an enlarged view of boxed region in (C). Arrowheads indicate GFP+ cells originating from a Cux2+ RGC that extend subcerebral projections. (G–J) Example of brain section from Fezf2-CreERT2; RCE-GFP mouse that received TM at E10.5 and was injected with Ctß at P8. (H–J) Enlarged view of boxed regions shown in (G). Arrowheads indicate GFP; Ctß double-positive cells. Abbreviations: Ctx, cerebral cortex; Hip, hippocampus; LV, lateral ventricle. Scale bars represent 500 μm in (C) and (G) and 100 μm in (F) and (J). Neuron 2015 86, 1100-1108DOI: (10.1016/j.neuron.2015.04.020) Copyright © 2015 Elsevier Inc. Terms and Conditions