Volume 10, Issue 5, Pages (May 2006)

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Volume 10, Issue 5, Pages 657-665 (May 2006) Cdo Functions at Multiple Points in the Sonic Hedgehog Pathway, and Cdo-Deficient Mice Accurately Model Human Holoprosencephaly  Wei Zhang, Jong-Sun Kang, Francesca Cole, Min-Jeong Yi, Robert S. Krauss  Developmental Cell  Volume 10, Issue 5, Pages 657-665 (May 2006) DOI: 10.1016/j.devcel.2006.04.005 Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 1 C57BL/6 Mice Lacking Cdo Have HPE (A and B) Newborn Cdo−/− mouse (A) displays a cebocephalic face with a single nostril (arrow, [B]). (C–E) Whole Cdo+/+ and Cdo−/− embryos at E15.5 (C) and E12.5 (D and E). Arrows: midline defects include cebocephaly (C) and incomplete forebrain clefting (D and E). (F and G) Hematoxylin and eosin-stained sections of E11.5 Cdo+/− and Cdo−/− embryos. Note the paired lateral ventricles in the Cdo+/− embryo (F) and single ventricle in the Cdo−/− embryo (G). Bar, 0.2 mm. (H) Dissected brains of E18.5 Cdo+/− and Cdo−/− embryos. Arrows: presence or absence of olfactory bulbs. (I and J) Nissl-stained sections through brains shown in (H). Developmental Cell 2006 10, 657-665DOI: (10.1016/j.devcel.2006.04.005) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 2 Decreased Shh Target Gene Expression in Developing Forebrains of Cdo−/− Embryos (A) Cdo reporter expression in E8.5 PCP (arrows). Left to right: dorsal, ventral, lateral views. (B–D, F, and G) Whole-mount in situ hybridization. Shh at E8.75 (B) and E9.5 (C); Gli1 at E9.5 (D); Nkx2.1 at E9.5 (F); Fgf8 at E9.0 (G). (E) Ptch1 reporter expression at E9.0. Asterisks (B–G), ventral region of the optic vesicle (note decreased Shh target gene expression anterior to this structure, in developing ventral forebrains of Cdo−/− embryos); arrowheads (B), Shh expression in developing ventral forebrain; brackets (C–G), wild-type expression domain; arrows (G), mid-hindbrain boundary. (B–G) Left two panels, lateral view; right two panels, ventral view, except (G), frontal view. Bars, 0.2 mm; except (A), left two panels of (B), and right two panels of (F), 0.1 mm. Developmental Cell 2006 10, 657-665DOI: (10.1016/j.devcel.2006.04.005) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 3 Cdo Regulates Shh Signaling In Vitro (A, C, and E) Gli-luc reporter assays ± Shh with cotransfection of the indicated rat Cdo (rCdo) and mouse Cdo (mCdo) RNAi expression plasmids (+). 10T1/2 cells were transfected with control vectors (−) as described in Experimental Procedures. Data are reported as relative light units (RLU; luciferase/Renilla internal control). Values are means ± 1 SD from at least three experiments, each performed in triplicate. Cyc, cyclopamine. (B) Western blot analysis of endogenous Cdo protein levels in 10T1/2 cells plated at the indicated densities and harvested as pictured 24 hr later. (D) Western blot analysis of RNAi-mediated knockdown of endogenous Cdo protein in 10T1/2 cells. (F) TRE-luc reporter assays ± cotransfection with activated H-Ras vector, ± mCdo RNAi vector. Transfections performed and values reported as in (A), (C), and (E). (G) RT-PCR analysis of endogenous Ptch1 and Gli1 mRNA expression in 10T1/2 cells transfected with the indicated rCdo and mCdo RNAi vectors, ± Shh treatment. Gapdh mRNA was used as a control. Developmental Cell 2006 10, 657-665DOI: (10.1016/j.devcel.2006.04.005) Copyright © 2006 Elsevier Inc. Terms and Conditions

Figure 4 Hh Pathway Analysis In Vitro and Effects of Cdo Deletion Mutants and Boc (A–D) Gli-luc reporter assays with transfected SmoA1 (A and C) or Gli1 (B and D) expression vectors as activators and cotransfection of the indicated rCdo and mCdo RNAi expression plasmids. (E) Western blot analysis of transfected Gli1 and Gli2 levels in the absence and presence of increasing amounts of mCdo RNAi vector. Gli proteins were detected by a Flag epitope tag, endogenous Cdo, and cadherin (used as a control) by antibodies to the native proteins. (F and H) Gli-luc reporter assays with transfected Gli2 or Gli2-ΔN2 (F) and NF-Gli1 or NF-Gli1/VP16 (H) expression vectors as activators and cotransfection of control or mCdo RNAi expression plasmids. (G) GAL4-luc reporter assays with the control (GAL4-BD) and Gli2 activation domain-containing expression vectors (BD-C; BD-A1 and BD-A2) as activators and cotransfection of control or mCdo RNAi expression plasmids. (I and J) Gli-luc reporter assays ± Shh with cotransfection of the indicated rCdo, mutant rCdo, and mCdo RNAi expression plasmids. (K) Western blot analysis of expression of rCdo, ΔFNI, and ΔICR1 in transfected 10T1/2 cells. (L and M) Gli-luc reporter assays ± Shh (L) or transfected Gli expression vector (M) as activators with cotransfection of control or Boc RNAi expression plasmids. (N) Western blot analysis of RNAi-mediated knockdown of endogenous Boc protein in 10T1/2 cells. (A–D, F–H, L, and M) Transfections were performed and values reported as in Figure 3. Developmental Cell 2006 10, 657-665DOI: (10.1016/j.devcel.2006.04.005) Copyright © 2006 Elsevier Inc. Terms and Conditions