SUPPLEMENTARY INFORMATION. Otx2 controls neuron subtype identity in ventral tegmental area and antagonizes
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1 Di Salvio et al. 1 SUPPLEMENTARY INFORMATION Otx2 controls neuron subtype identity in ventral tegmental area and antagonizes vulnerability to MPTP Michela Di Salvio, Luca Giovanni Di Giovannantonio, Dario Acampora, Raffaele Prosperi, Daniela Omodei, Nilima Prakash, Wolfgang Wurst and Antonio Simeone
2 Di Salvio et al. 2 Supplementary Fig. 1. Generation of the R26 Otx2/+ mutant and Otx2 over-expression in ES cells. (a) Schematic representation of the R26 locus (upper line) where the Neo-Otx2 Ires GFP cassette is inserted (second line). (b) Genomic analysis with probe A confirming the correct insertion of the Neo-Otx2 cassette. (c) R26 Otx2/CreER and totx2 ov/+ ;R26 CreER/+ ES cell lines are compared before and after Tamoxifen administration to monitor the removal of the Neo-triple polya cassette, the relative level of the over-expressed Otx2 and GFP activation. The horizontal arrow in (a) indicates the transcription start site; the horizontal arrowheads the position of primers for genotyping. The probe A used for Southern blot analysis was also indicated.
3 Di Salvio et al. 3 Supplementary Fig. 2. The expression of Pitx3, Foxa2 and Nurr1 is apparently not affected by lack or activation of Otx2. (a r) Immunohistochemistry experiments on week old Dat ICre/+ ;Otx2 GFP/+ (a c) Dat ICre/+ ;Otx2 GFP/flox (d f), Dat ICre/+ (g i, m o) and Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov (j l, p r) mice with Pitx3-GFP (a,d), Foxa2-GFP (b,e), Nurr1- GFP (c,f), Pitx3-TH (g,j,m,p), Foxa2-TH (h,k,n,q) and Nurr1-TH (i,l,o,r) show no evident abnormalities in mutant brains. Scale bar in (a,g) corresponds to 100µm (a) and 200µm (g). Scale bar in (a) refers to sections in (a f, m r); scale bar in (g) to sections in (g l).
4 Di Salvio et al. 4 Supplementary Fig. 3. Activation of Otx2 extra-copies does not affect the survival of mdda neurons. Graphic representation showing that, compared to week old Dat ICre/+ control mice (n = 10), the percentage of SNpc and VTA TH + neurons is not significantly affected by activation of Otx2 extra-copies in any of the analyzed mouse mutants (n = 10/genotype) (P between Dat ICre/+ and each mutant is 0.22 for both SNpc and VTA; Student t test).
5 Di Salvio et al. 5 Supplementary Fig. 4. Activation of high dosages of Otx2 does not affect the identity of SNpc neuronal subsets. (a) Graphic representation showing that, compared to week old Dat ICre/+ (n = 7) control mice, the percentage of SNpc TH + neurons co-expressing Calb, Ahd2 and Girk2 is not significantly affected in Dat ICre/+ ;R26 Otx2/Otx2 (n = 7) and Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov (n = 7) mutants of the same age ( P 0.1 for Calb; P 0.18 for Ahd2; P 0.12 for Girk2; Student t test). (b j) Representative SNpc sections of Dat ICre/+ (b,e,h), Dat ICre/+ ;R26 Otx2/Otx2 (c,f,i) and Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov (d,g,j) mice immunostained with TH-Calb (b d), TH-Ahd2 (e g) and TH-Girk2 (h j) reveal no evident abnormalities in mutants. Scale bar (b) corresponds to 200µm and refers to all sections.
6 Di Salvio et al. 6 Supplementary Fig. 5. A second glyco-dat antibody confirms altered number of neurons with high level of glyco-dat in Otx2 mutants. (a d) Immunohistochemistry assays with a second glyco-dat antibody show that compared to Dat ICre/+ ;Otx2 GFP/+ mice (a,b), Dat ICre/+ ;Otx2 GFP/flox mutants (c,d) exhibit an increased number of glyco-dat + -GFP + neurons in the central VTA. (e) Graphic representation showing that, compared to Dat ICre/+ ;Otx2 GFP/+ control mice, in Dat ICre/+ ;Otx2 GFP/flox mutants a significant increase in the number of neurons co-expressing high level of glyco-dat and GFP was detected (26% vs 13.5% of control mice, * P <<0.001; Student t test). (f m) Immunohistochemistry assays on Dat ICre/+ (f i) and Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov (j m) mice show that in the SNpc (f,g,j,k) and VTA (h,i,l,m) the number of TH + neurons expressing high level of glyco-dat is remarkably diminished in mutants (j m). (n) Graphic representation showing that the percentage of TH + neurons expressing high level of glyco-dat is significantly decreased in both SNpc (18% vs 51.7% of control mice, * P <<0.001; Student t test) and VTA (10.5% vs 23.7% of control mice, ** P <<0.001; Student t test) of mutant mice. (o) Western blot assay performed on striatal extracts shows an evident reduction of glyco-dat in Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov mutants. (b,d,g,k,i,m) are magnifications of the area boxed in (a,c,f,j,h,l). (D,C,V) stand for dorsal, central and ventral VTA. Scale bar in (a,b,f,g) corresponds to 100µm (a,b) and 200µm (f,g). Scale bar in (a) refers to sections in (a,c,h,l); scale bar in (b) refers to sections in (b,d,i,m); scale bar in (f) to (f,j); and scale bar in (g) to (g,k).
7 Di Salvio et al. 7 Supplementary Fig. 6. Schematic summary of the phenotypic impairments detected in the VTA of mouse mutants lacking or ubiquitously expressing extra-copies of Otx2. (a) Otx2 is normally expressed in a relevant fraction of VTA neurons prevalently confined to the central and medial-ventral region of the VTA, even though few Otx2 + neurons may be detected also in dorsal-lateral neurons which in large majority are Girk2 + and glyco-dat +. (b) In the absence of Otx2, a relevant increase in the number of GFP + neurons expressing Girk2 and glyco-dat was detected in the central region of the VTA. This increase is reminiscent of a medial-ventral expansion of the dorsal-lateral identity. (c) Conversely, Dat ICre/+ ;R26 Otx2/Otx2 or Dat ICre/+ ;R26 Otx2/Otx2 ;totx2 ov/ov mutants exhibit a repression of the dorsal-lateral identity. Together these abnormalities lead us to hypothesize a presumptive boundary running between the two subpopulations of VTA neurons expressing or not Otx2 (black line). Neurons are represented as filled circles and the number of those expressing the different combinations of markers (filled circles in red, yellow, green, and pale blue) approximately reflects to the experimental percentages. (D, C, V) stand for dorsal, central and ventral VTA and correspond to areas with low, intermediate and high density of Otx2 + -TH + neurons.
8 Di Salvio et al. 8 Supplementary Fig. 7. Full length Western blots and RT-PCRs gel showing the results reported in Figs. 4j and 5a,b. The lanes selected are demarcated by a box and the antibody used is shown below each square. For the RT-PCR experiments the lanes corresponding to Dat, TH and Nurr1 mrnas are also boxed.
9 Di Salvio et al. 9 Supplementary Fig. 8. Anatomical levels along the SNpc and VTA analyzed in all cellcounting experiments. (a l) Sequential sections along the SNpc and VTA are selected from level 2 to 5 (b e, h k) for all the cell-counting experiments. Sections at level 1 and 6 (a,g,f,l) are always excluded. The demarcated area defines the SNpc and VTA territory analyzed. Since no abnormalities are detected in the general morphology of the SNpc and VTA in the mutants analyzed, the criteria employed for selection of control sections are applied also to the mutants. Scale bar in (a,g) corresponds to 200µm (a) and 100µm (g). Scale bar in (a) refers to sections in (a f); scale bar in (g) to sections in (g l).
10 Di Salvio et al. 10 Table S1 Cell counting experiments in mice lacking or expressing extra-copies of Otx2 Number of mdda neurons (mean ± s.d.) Genotype Mice (n) GFP + TH + GFP + -TH + GFP -TH + GFP + -TH Dat ICre/+ ;Otx2 GFP/ ± ± ± ± ± 40 Dat ICre/+ ;Otx2 GFP/flox ± ± ± ± ± 31 GFP + Calb + -GFP + Ahd2 + -GFP + Girk2 + -GFP + Dat ICre/+ ;Otx2 GFP/ ± ± ± ± 17 Dat ICre/+ ;Otx2 GFP/flox ± ± ± ± 22 GFP + glyco-dat + -GFP + Dat ICre/+ ;Otx2 GFP/ ± ± 31 Dat ICre/+ ;Otx2 GFP/flox ± ± 25 TH in SNpc TH in VTA Dat ICre/ ± ± 112 Dat ICre/+ ;R26 Otx2/ ± ± 104 Dat ICre/+ ;totx2 ov/ov ± ± 99 Dat ICre/+ ;R26 Otx2/Otx ± ± 103 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± 87 totx2 ov/ov SNpc TH + Calb + -TH + Ahd2 + -TH + Girk2 + -TH + Dat ICre/ ± ± ± ± 37 Dat ICre/+ ;R26 Otx2/Otx ± ± ± ± 35 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± ± ± 38 totx2 ov/ov TH + Calb + -TH + Ahd2 + -TH + Girk2 + -TH + Dat ICre/ ± ± ± ± 36 Dat ICre/+ ;R26 Otx2/Otx ± ± ± ± 51 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± ± ± 54 totx2 ov/ov SNpc TH + glyco-dat + -TH + TH + glyco-dat + -TH + Dat ICre/ ± ± ± ± 61 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± ± ± 35 totx2 ov/ov VTA VTA
11 Di Salvio et al. 11 Table S2 Cell counting experiments in mice lacking or expressing extra-copies of Otx2 Number of mdda neurons (mean ± s.d.) VTA Genotype Mice (n) GFP + glyco-dat + -GFP + Dat ICre/+ ;Otx2 GFP/ ± ± 25 Dat ICre/+ ;Otx2 GFP/flox ± ± 41 SNpc VTA TH + glyco-dat + -TH + TH + glyco-dat + -TH + Dat ICre/ ± ± ± ± 33 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± ± ± 30 totx2 ov/ov
12 Di Salvio et al. 12 Table S3 Cell counting experiments in MPTP-treated and untreated mice Number of VTA TH + neuronal subsets (mean ± s.d.) MPTP-treated (100mg/Kg) MPTP-untreated* Genotype Mice (n) TH + GFP + -TH + GFP -TH + TH + GFP + -TH + GFP -TH + Dat ICre/+ ;Otx2 GFP/ ± ± ± ± ± ± 47 Dat ICre/+ ;Otx2 GFP/flox ± ± ± ± ± ± 49 MPTP-treated (125mg/Kg) Dat ICre/+ ;Otx2 GFP/ ± ± ± 44 Dat ICre/+ ;Otx2 GFP/flox ± ± ± 36 Number of TH + neurons (mean ± s.d.) MPTP-treated (125mg/Kg) SNpc MPTP-untreated* SNpc Dat ICre/+ ;Otx2 GFP/ ± ± 56 MPTP-treated (100mg/Kg) MPTP-untreated* SNpc VTA SNpc VTA Dat ICre/ ± ± ± ± 112 Dat ICre/+ ;R26 Otx2/Otx ± ± ± ± 103 Dat ICre/+ ;R26 Otx2/Otx2 ; ± ± ± ± 87 totx2 ov/ov * Neuronal numbers for MPTP-untreated mice correspond to those of Supplementary Table 1
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