EMBO/SourceData huggingface dataset:
Figure 7(A, E, F) Immunofluorescence images of control and tamoxifen treated suit-2 cells, scale bar is 20 μm. Panel A represents HIF-1A staining in hypoxia and non-hypoxia conditions, panels E and F show Ki67 and Cc3 staining as markers of proliferation and caspase-mediated apoptosis, respectively. Panel E: Red - F-actin, green - Ki67, blue - nuclei. Tamoxifen negatively regulates HIF-1A in hypoxia and non-hypoxia conditions. (B,C,D) Quantification of immunofluorescence staining in panels A, E, F. For quantification, eight fields of view (n>50 cells) per condition. Histogram bars represent mean ± s.e.m.; ***P<0.001, t-test. All panels include data collected during 3 independent experiments
Figure 1A Montage of class averages and 3D volumes of humanTFG (amino acids 1‐193; EMDataBank accession code EMD‐6076). Two sets of 2D class averages and 3D volumes are shown with the left columns showing the class averages generated by reference‐free alignment and classification and the right columns showing 3D RCT volumes corresponding to the class average to the left. Scale bars, 50 Å.B Montage of class averages and 3D volumes of C. elegans TFG (amino acids 1‐195; EMDataBank accession code EMD‐6075), generated as described in (A). Scale bars, 50 Å.C Superposition of 3D volumes of full‐length human TFG and truncated TFG (amino acids 1‐193). The truncated form is depicted in yellow, while the full‐length form is depicted as gray mesh. The top view (top) exhibits limited differences in the structures, while the side view (bottom) shows extra density in the full‐length TFG isoform. Scale bar, 25 Å.
Figure 2A TFG particle size was determined using dynamic light scattering under increasing potassium acetate concentrations. Error bars represent mean ± SEM; n = 10 replicates.B Confocal microscopy images of recombinant, BODIPY‐labeled TFG in the presence of varying potassium acetate concentrations. Scale bar, 2 μm.C Recombinant TFG in the presence of varying potassium acetate concentrations was imaged by negative stain‐EM. Large arrowheads highlight TFG polymers (only found in the presence of elevated potassium acetate). Small arrowheads highlight individual 11 nm cup‐like TFG octamers. Scale bar, 30 nm.D Circular dichroism spectroscopy was used to characterize the carboxyl‐terminus of C. elegans TFG (amino acids 195‐486). Samples were analyzed at different concentrations, and the data were normalized relative to one another. CD spectra were collected at 25°C in 25 mM sodium phosphate (pH 7.2) using a 1 mm path length quartz cell. The spectra are characteristic of an intrinsically disordered protein.
Figure 3A The distributions of endogenous TFG and ERGIC‐53 were examined in hTERT‐RPE‐1 cells stably expressing low levels of mApple‐Sec16B using SR‐SIM (more than 15 cells analyzed on 3 separate occasions). Scale bar, 5 μm. Inset scale bar, 1 μm.B Cells stably expressing low levels of GFP‐Sec16B and mRuby‐Sec23A (Sec23A) were fixed and imaged using SR‐SIM (n = 12). Scale bar, 5 μm. Inset scale bar, 1 μm.C The distribution of endogenous TFG was examined in cells stably expressing low levels of mRuby‐Sec23A (Sec23A) using SR‐SIM (n = 10). Scale bar, 5 μm. Inset scale bar, 1 μm.D The distributions of endogenous TFG and Sec31A were examined using g‐STED (n = 8). Scale bar, 1 μm.E The distributions of endogenous TFG and Sec31A were examined using immunogold EM. Large arrowheads highlight 15 nm gold particles bound to α‐TFG antibodies. The small arrowhead highlights 5 nm gold particles bound to α‐Sec31A antibodies. At least 15 different cells were examined, and representative images are shown. Scale bar, 100 nm.
Figure 4A Cells depleted of endogenous TFG were transfected with a variety of TFG transgenes (including full‐length, untagged TFG, a truncation mutant encoding amino acids 1‐300 of untagged TFG, and a truncation mutant encoding amino acids 1‐350 of untagged TFG) and stained using α‐TFG and α‐Sec31A antibodies. Scale bar, 5 μm. Inset scale bar, 1 μm. Images shown are representative of at least 15 individual cells analyzed for each condition.B A recombinant polyhistidine‐ and SUMO‐tagged TFG fragment (Sumo‐TFGc, amino acids 194‐400; total molecular mass of 42 kDa) was expressed and purified from Escherichia coli extracts using nickel affinity resin. Coomassie‐stained gels of the peak elution fractions after separation of the recombinant protein on a S200 gel filtration column (top) or a 10-30% glycerol gradient (bottom) are shown. To determine the native molecular weight of the protein, the following equation was used: M = 6πηNas/(1 − υρ), where M is the native molecular weight, η is the viscosity of the medium, N is Avogadro's number, a is the Stokes radius, s is the sedimentation value, υ is the partial specific volume, and ρ is the density of the medium (Siegel Monty, ). These data suggest that this fragment of TFG is capable of forming dimers in solution.C, D Control cells (C) or cells depleted of endogenous TFG (D) were transfected with a construct expressing TFG with a carboxyl‐terminal GFP tag and stained using α‐Sec31A antibodies. Scale bar, 5 μm. Images shown are representative of at least 20 individual cells analyzed for each condition.
Figure 5A HumanRPE‐1 cells were mock‐transfected (control) or transfected with a TFG siRNA for 60 h. Cells were fixed and stained using α‐Sec16A and α‐Sec31A antibodies and imaged using confocal microscopy. Images shown are projections of 3D data sets (4 μm in z). Both individual and merged images with Sec16A in green and Sec31A in red are shown (at least 15 cells for each condition). Scale bar, 5 μm. Higher magnification views of the indicated regions (boxed) are also shown in the lower or upper right portion of each image. Inset scale bar, 1 μm.B Quantification of the number of Sec31A‐labeled structures in a 4 μm2 region. For both conditions (control or TFG siRNA‐treated), at least 50 distinct regions away from the peri‐nuclear Golgi were examined. Error bars represent mean ± SEM; at least 15 different cells per condition. **P 0.01 compared with control, calculated using a paired t‐test.C Quantification of the number of Sec16A‐labeled structures in a 4 μm2 region. For both conditions (control or TFG siRNA‐treated), at least 50 distinct regions away from the peri‐nuclear Golgi were examined. Error bars represent mean ± SEM; at least 15 different cells per condition. No statistically significant difference was observed, following analysis using a paired t‐test.D Cells stably expressing low levels of GFP‐ERGIC‐53 and mRuby‐Sec23A were fixed and imaged using SR‐SIM (top), or depleted of endogenous TFG prior to fixation and SR‐SIM imaging (bottom). Images shown are representative of at least 15 individual cells analyzed for each condition. Scale bar, 5 μm. Inset scale bar, 1 μm.E HumanRPE‐1 cells were mock‐transfected (control) or transfected with a TFG siRNA for 60 h. Cells were fixed and stained using α‐Sec16A and α‐ERGIC‐53 antibodies and imaged using SR‐SIM. Images shown are projections of 3D data sets (4 μm in z). Both individual and merged images with Sec16A in green and ERGIC‐53 in red are shown (at least 15 cells for each condition). Scale bar, 5 μm. Higher magnification views of the indicated regions (boxed) are also shown in the lower or upper right portion of each image. Arrowheads highlight Sec16A‐labeled structures that do not exhibit juxtaposed ERGIC‐53 staining. Inset scale bar, 1 μm.F Based on structured illumination microscopy, quantification of the number of Sec16A‐labeled structures juxtaposed (within 500 nm) to ERGIC‐53‐labeled structures is shown. For both conditions (control or TFG siRNA‐treated), at least 1,000 unique Sec16A‐labeled structures were examined. Error bars represent mean ± SEM; at least 15 different cells per condition. **P 0.01 compared with control, calculated using a paired t‐test.
Figure 6A HumanRPE‐1 cells stably expressing low levels of mannosidase II‐mApple (ManII‐mApple) were mock‐transfected (control) or transfected with a TFG siRNA for 60 h, then fixed and stained using TFG antibodies and imaged using confocal microscopy. Alternatively, cells were either treated with DMSO (top row) or brefeldin A (BFA) for 1 h (middle row), followed by fixation, or washed into fresh media following DMSO or BFA treatment for 30 min (bottom row), prior to fixation. Images shown are projections of 3D data sets (4 μm in z). Merged images with TFG in green and ManII in red are shown. Scale bar, 5 μm. Images shown are representative of at least 10 individual cells analyzed for each condition.B Human RPE‐1 cells were mock‐transfected (control) or transfected with a TFG siRNA for 60 h, then fixed and stained using TFG and GM130 antibodies and imaged using confocal microscopy. Alternatively, cells were either treated with DMSO (top row) or brefeldin A (BFA) for 1 h (middle row), followed by fixation, or washed into fresh media following DMSO or BFA treatment for 30 min (bottom row), prior to fixation. Images shown are projections of 3D data sets (4 μm in z). Merged images with TFG in green and GM130 in red are shown. Scale bar, 5 μm. Images shown are representative of at least 10 individual cells analyzed for each condition.C Higher magnification views of the indicated regions in (B, boxed) are shown (GM130 distribution only). Scale bar, 2 μm.
Figure 7A HumanRPE‐1 cells stably expressing low levels of mannosidase II‐mApple were transfected with a TFG siRNA for 60 h. Cells were subsequently treated with brefeldin A (BFA) for 1 h, followed by a wash into fresh media and further incubation for 2 h in the absence of BFA, prior to fixation. Images shown are projections of 3D data sets (4 μm in z). Merged images with Sec31A in green and ManII in red are shown (representative of at least 15 cells analyzed). Scale bar, 5 μm.B HumanRPE‐1 cells stably expressing low levels of mannosidase II‐mApple were transfected with a TFG siRNA for 60 h. Cells were subsequently treated with BFA for 1 h, followed by a wash into fresh media and further incubation for 1 h in the absence of BFA, prior to fixation and staining using α‐Sec16A and α‐Sec31A antibodies. Images shown are projections of 3D data sets (4 μm in z). Merged images with Sec31A (green), ManII (red), and Sec16A (blue) are shown (representative of at least 15 cells analyzed). Scale bar, 5 μm.C Higher magnification views of the indicated regions in (B, boxed) are shown. Arrows highlight COPII‐positive transport carriers that contain the cargo ManII, which are not juxtaposed to Sec16A‐labeled sites on the ER. Additionally, arrowheads point out distinct foci in which COPII continues to associate with Sec16A‐labeled sites, indicating that COPII vesicle formation continues in the absence of TFG. Scale bar, 1 μm.
Figure 1Formalin-fixed paraffin-embedded (FFPE) sections from control or Tgif1KO mice were immunostained with anti-pSmad2 antibody and revealed by immunofluorescence (IF) and DAPI. Representative pictures at 40x are shown (n=30). Scale bars, 100 μM.FFPE pancreatic sections from control or Tgif1KO mice were stained with hematoxylin and eosin (H&E) or immunostained with antibodies to CK19 or Amylase and revealed by IHC. Representative pictures at 20x are shown (n=30). Scale bars, 200 μM.Kaplan-Meyer survival analysis of control, Tgif1KO, KC and KTC mice. A regular mosaic two-colors line was used to discriminate between control and Tgif1KO mice.Pictures of whole pancreas and spleen tissues from control, Tgif1KO, KC or KTC mice (left). Weight of pancreas was measured and presented as dot plot (n=30).FFPE pancreatic sections from control, Tgif1KO, KC or KTC were stained with H&E or subjected to IHC analysis using antibodies to CK19 or α-SMA. Yellow arrows indicate PanINs in KC mice. Representative pictures at 20x are shown (n=30). Scale bars, 200 μM.
Figure 2Representative pictures of dissected abdominal region of KC and KTC mice. Yellow arrows indicate metastatic nodules in liver. Yellow dotted lines show the pancreas.FFPE sections of pancreas, liver, lungs or lymph-nodes from control, KC or KTC mice were stained with H&E or immunostained with anti-Vimentin antibody and revealed by IF. Representative pictures at 4x (Lymph node, H&E), 10x (Liver, H&E) and 20x (Pancreas, H&E; Lung, H&E; Lymph node, IF-Vimentin) are shown (n=18 to 30). Scale bars, 1,000 μM (Lymph node, H&E), 400 μM (Liver, H&E) and 200 μM (Pancreas, H&E; Lung, H&E; Lymph node, IF-Vimentin).Tumor volume and metastasis in live KCLuc and KTCLuc mice were analyzed by IVIS bioluminescence. Following imaging live animals, pancreas, brain, liver and lung were dissected and analyzed again by IVIS bioluminescence (n= 6, 5 out of 6 mice developed metastasis to liver and lung).Total cell lysates from pancreas of control, KC or KTC mice were pooled and analyzed by immunoblotting using antibodies to pSmad2, Smad2 or JunB (n=6).Expression of JunB in pancreas from control, KC or KTC mice (same as in D) was analyzed by qRT-PCR (n=6). Data are expressed as mean ± SEM. **p< 0.01; based on a two-tailed Student's test.
Figure 3Protein extracts from MIAPaCa-2 cells (left) and control or Tgif1KO mice (right) were immunoprecipitated using normal IgG, anti-TGIF1 or anti-Twist1 antibody and analyzed by immunoblotting using antibodies to Twist1 or TGIF1 (A-C).Protein extracts from control or Tgif1KO mice (right) were immunoprecipitated using normal IgG, anti-TGIF1 or anti-Twist1 antibody and analyzed by immunoblotting using antibodies to Twist1 or TGIF1 To control for loading, total cell lysates were analyzed by immunoblotting using antibodies to Twist1, TGIF1 or β-Actin.Protein extracts from MIAPaCa-2 cells (left) and control were immunoprecipitated using normal IgG, anti-TGIF1 or anti-Twist1 antibody and analyzed by immunoblotting using antibodies to Twist1 or TGIF1 In C, cell lysates were treated with DNase I before coimmunopreciptation.Panc-1 cells were treated with TGF-β for 30 min, and protein extracts were immunoprecipitated with anti-TGIF1 antibody and analyzed by immunoblotting using anti-Twist1 antibody. To control for activation of TGF-β signaling, total cell lysates were analyzed by immunoblotting using anti-pSmad2 antibody.PL45 stably expressing Dox-inducible control or sh-RNA targeting TGIF were treated with vehicle or Dox for 48 hr and analyzed for Twist1 expression by immunoblotting or qRT-PCR (n=6). In left panel, the intensity of the bands was assessed by densitometry, and the result was presented as a ratio of Twist1/TGIF1.PL45 stably expressing Dox-inducible TGIF1 were treated with vehicle or Dox for 48 hr and analyzed for binding of TGIF1 to the Twist1 promoter by ChIP and agarose gel.Pancreatic chromatin from control or Tgif1KO mice was analyzed for binding of TGIF1 to the Twist1 promoter by ChIP and agarose gel.
Figure 4PL45 stably expressing both Dox-inducible TGIF1 and Tam-inducible Twist1 (Twist1ER) were treated with Tam and/or Dox for 48 hr and analyzed for Twist1 expression by immunoblotting or qRT-PCR (n=6).MIAPaCa-2 cells were transfected with wild-type or mutated (Twist1 binding site) Twist1 luciferase reporters (TGTLuc) together with increasing amounts of Twist1 expression vector in the presence of empty vector (EV) or TGIF1 expression vector. Luciferase activity was measured 48 hr following transfection and normalized on the basis of co-transfected Renilla luciferase (n=6).Total lysates from pancreas of control, KC or KTC mice were pooled and analyzed by immunoblotting using antibodies to E-Cadherin, Vimentin, p16Ink4A and β-Actin (n=6).Expression of Cdh1, Vimentin, and p16Ink4A in pancreas from control, KC or KTC mice (same as in C) was analyzed by qRT-PCR (n=6).FFPE pancreatic sections from control, KC or KTC mice were stained with H&E or immunostained with antibodies to E-Cadherin, Vimentin or p16Ink4a and revealed by IF or IHC. Representative pictures at 20x are shown (n=30). Scale bars, 200 μM.
Figure 5Kaplan-Meyer survival analysis of control, KTC and KTWC mice.FFPE sections of pancreas or liver from control, KTC or KTWC mice were stained with H&E or immunostained with anti-CK19 antibody and revealed by IHC. Representative pictures at 10x (Liver, H&E) or 20x (Pancreas, H&E; Pancreas, IHC-CK19) are shown (n=30). Scale bars, 400 μM (Liver, H&E) and 200 μM (Pancreas, H&E; Pancreas, IHC-CK19).Expression of Cdh1, Vimentin and p16Ink4A in pancreas from control, KTC or KTWC mice was analyzed by qRT-PCR (n=6).
Figure 6Specificity of anti-phospho-TGIF1 (pTGIF1) antibody. Cell extracts from Tgif1-/- MEFs cells reconstituted with empty vector (EV), wild-type (TGIF1) or non-phosphorylated form (TGIF1.2TA) of Flag-TGIF1 were immunoblotted with anti-phospho-TGIF1 or β-Actin as a loading control.Expression of pTGIF1 and Twist1 in human tissue microarrays of human PDAC samples was analyzed by immunohistochemistry. Representative pictures at different stages (40x) are shown.The percentages of samples with high versus low expression of pTGIF1 and Twist1 in normal tissues versus PDAC tissues are shown. Scale bars, 100 μM.MIAPaCa-2 cells were transfected with TGIF1 or TGIF1.2TD expression vectors, selected with G418 and resistance colonies were pooled (n=6). Expression of Twist1 was examined by qRT-PCR (D).MIAPaCa-2 cells were transfected with TGIF1 or TGIF1.2TD expression vectors, selected with G418 and resistance colonies were pooled (n=6). Binding of TGIF1 to the Twist1 promoter was examined by ChIP and agarose gel.BxPC3 cells were transfected with TGTLuc together with TGIF1 or TGIF1.2TA in the presence or absence of KrasG12D. Luciferase activity was measured 48 hr following transfection and normalized on the basis of co-transfected Renilla luciferase (n=6).BxPC3 cells were transfected with CDH1Luc or p16Luc reporter together with TGIF1 or TGIF1.2TA in the presence or absence of KrasG12D and luciferase activity was measured 48 hr following transfection as described in (E) (n=6).
Figure 7Representative microscope pictures (20x) of MIAPaCa-2, Suit-2, Capan-2 and Panc-1 cells. Scale bars, 200 μM.Expression of TGIF1 and Twist1 in MIAPaCa-2, Suit-2, Capan-2 and Panc-1 cells was analyzed by immunoblotting.MIAPaCa-2, Suit-2, Capan-2 and Panc-1 cells were transfected with empty vector (EV), wild-type (TGIF1) or phosphorylation mimic mutant (TGIF1.2TD) of TGIF1. Cell extracts were analyzed 48 hr following transfection by immunoblotting using anti-Flag antibody (C).MIAPaCa-2, Suit-2, Capan-2 and Panc-1 cells were transfected with empty vector (EV), wild-type (TGIF1) or phosphorylation mimic mutant (TGIF1.2TD) of TGIF1. Cells were selected with neomycin for 2-3 weeks, and counted using an automatic cell counter (D) (n=6).
Figure 1Asynchronously growing human U-2 OS cells were treated with 0.5 Gy of IR, allowed to recover for the indicated time periods, and stained for 53BP1 and DNA content for cell cycle resolved quantification of 53BP1 foci in individual cells by QIBC.Representative images from the QIBC analysis in (A). Scale bars, 10 μm.Cells were treated with 0.5 Gy of IR in absence or presence of 0.4 M sorbitol, fixed 1h later, and 53BP1 assembly at DSBs was analyzed by QIBC. Treatments as in (C); RIF1 accumulation at DSBs was analyzed by QIBC.
Figure 2U-2 OS cells were treated with 0.5 Gy of IR, allowed to recover for the indicated time periods, stained for 53BP1 and MDC1, and analyzed by QIBC. 53BP1 foci intensities are plotted against MDC1 foci intensities, and representative images are shown.U-2 OS cells stably expressing GFP-MDC1 or GFP-53BP1 were treated with 1 Gy of IR and analyzed by live cell microscopy at 15 min intervals. Representative images are provided and kinetics of GFP-MDC1 and GFP-53BP1 foci formation and dissolution are shown as single cell tracks. Bold lines represent averages from n=29 for GFP-MDC1 and n=18 for GFP-53BP1 cells.
Figure 3U-2 OS cells were treated with 1 Gy of IR and fixed at the indicated time-points. Mean 53BP1 foci intensity was analyzed from more than 1500 cells per time-point. Mean (solid line) and standard deviation from the mean (dashed lines) are indicated. The same cells as in (A) were analyzed for mean MDC1 foci intensity. Mean (solid line) and standard deviation from the mean (dashed lines) are indicated.GFP-53BP1 cells were treated with 25 ng/ml NCS to induce DNA breaks and imaged at 30 minutes intervals. Examples of GFP-53BP1 fusions (green arrowheads and magnified regions) and fissions (blue arrowheads and magnified regions) are shown.53BP1-RFP cells, in which the endogenous 53BP1 gene locus had been engineered by CRISPR/Cas9 to express 53BP1-mScarlet from the natural promoter, were treated with NCS (25 ng/ml) and imaged at 30 minutes intervals. Examples of 53BP1 fusions (green arrowheads and magnified regions) and fissions (blue arrowheads and magnified regions) are shown on the left and in higher magnification on the right.GFP-53BP1 cells were left untreated, or treated with APH (0.5 μM) or ATRi (1 μM) to induce replication stress-associated heritable DNA lesions, and cells were imaged at 30 minutes intervals. Examples of 53BP1 fusions (green arrowheads and magnified regions) are shown.
Figure 4Light-induced optoDroplet formation of Cry2-mCherry-53BP1, Cry2-mCherry-53BP1 W1495A, and Cry2-mCherry-MDC1. Cells were imaged at 15 seconds intervals. Representative images of optoDroplet formation before and 6 minutes after light induction are shown. Quantifications from single-cell QIBC analysis of 2-3 independent experiments are shown with mean (solid line) and standard deviation from the mean (dashed lines) indicated.Cry2-mCherry-53BP1 W1495A optoDroplet fusion at 15 seconds time resolution. Fusing optodroplets are highlighted by green arrowheads and in the magnified insets.Light-induced optoDroplet formation of the indicated Cry2-mCherry-53BP1 constructs. Cells were imaged at 15 seconds intervals. Representative images and quantifications of optoDroplet formation before and 6 minutes after light induction are shown. Quantifications from single-cell QIBC analysis of 2-3 independent experiments are shown with mean (solid line) and standard deviation from the mean (dashed lines) indicated. Red bars indicate the part of 53BP1 that was expressed as Cry2-mCherry fusion.
Figure 5Cry2-mCherry-53BP1 1203-1972 W1495A optoDroplets undergo fusion events upon light induction. Fusing optodroplets are highlighted by green arrowheads and in the magnified insets.Concentration-dependent optoDroplet formation exemplified by two neighboring cells that differ in their Cry2-mCherry-53BP1 1203-1972 W1495A expression level. Cells were imaged at 15 seconds intervals. Quantifications of optoDroplet formation in lowly expressing cells (mClow) and highly expressing cells (mChigh) from single-cell QIBC analysis of 3 independent experiments are shown with mean (solid line) and standard deviation from the mean (dashed lines) indicated.Cry2-mEGFP-53BP1 1203-1972 W1495A assembles into FokI-induced DNA repair compartments within seconds after light induction. FokI was induced for 1h where indicated before cells were light-activated and imaged at 15 seconds intervals. Red arrowheads mark the FokI-induced lesion with mCherry accumulation.
Figure 6Cry2-mCherry-53BP1 1203-1972 W1495A optoDroplets were induced as indicated and fixed 5 minutes later. Endogenous BRCA1 and p53 were co-stained.As in (A), comparing Cry2-mCherry-53BP1 constructs with and without the BRCT domains. Quantifications of p53 assembly into 53BP1 optoDroplets from single-cell QIBC analysis of 500-600 cells per condition are shown below with mean (solid line) and standard deviation from the mean (dashed lines) indicated. Red bars indicate the part of 53BP1 that was expressed as Cry2-mCherry fusion.Western blot of p53 induction upon DNA damage (10 Gy, 2h) with and without 0.4 M Sorbitol.qPCR of p21 induction upon DNA damage (10 Gy, 2h) with and without 0.4 M sorbitol. Mean ± standard deviation is indicated.Western blot of p21 induction upon DNA damage (10 Gy, 2h) with and without 0.4 M sorbitol.QIBC cell cycle analysis based on DNA content and nuclear Cyclin A levels upon DNA damage with and without 0.4 M sorbitol. Cells were irradiated with 2 Gy in absence or presence of 0.4 M sorbitol. After 1h of recovery, sorbitol-containing medium was exchanged with fresh medium, and cells were allowed to recover for an additional 7h. Percentages in G1 and S/G2 are provided.