EMBO/SourceData huggingface dataset:
Figure 5 D, E. Ciliary accumulation of BBS proteins in Rabl2Q80L-expressing RPE1 cells. The white arrows (D) point to positions of cilia. Quantification results (E) were from three independent experiments. At least 100 GFP-positive cells were scored in each experiment and condition.  H, I. BBSomes and IFT-B were able to reach the ciliary base through retrograde IFT in the presence of Rabl2Q80L. Ciliary 3NG-Bbs5 (H) or Ift27-GFP (I) in IMCD3 cells co-expressing RFP-Rabl2 or RFP-Rabl2Q80L was live imaged at 4 fps. Snapshots for the ciliary RFP proteins, the first frames from Movies EV2-EV5, corresponding kymographs, and quantification results from the indicated numbers of cilia are presented. For processivity analysis (I), only traceable puncta were scored.
Figure 6 E, F. Rabl2D73GQ80L did not repress ciliary translocation of SMO and GPR161. RPE1 cells expressing GFP-tagged Rabl2Q80L or Rabl2D73GQ80L were serum-starved for 24 h and treated with DMSO (mock) or SAG for an additional 24 h prior to immunostaining (E). The white arrows (E) point to positions of cilia. In quantification results (F), at least 100 cells were scored in each experiment and condition.  G. Ciliary Rabl2D73GQ80L did not repress the BBSome export. FLIP assays were performed in RPE1 cells co-expressing 3NG-Bbs5 with RFP-tagged Rabl2Q80L or Rabl2D73GQ80L as depicted in Fig 5F. Photobleaching was executed at t = 0. Quantification results on half-life (t1/2) were from 10 cilia for each condition.
Figure 7 F, G. Endogenous Rabl2Q80L entered ciliary shaft to repress the export of the BBSome (Bbs5) and its cargo GPCR (Smo). mEPCs cultured from Rabl2KI/KI and wildtype neonatal mice were fixed at day 7 post serum starvation. Anti-Rabl2 antibody was used to visualize Rabl2 and Rabl2Q80L. Ac-tub or Arl13b served as ciliary marker. Representative micrographs of multicilia (F) and primary cilia (G) are shown. The white arrows point to positions of cilia.
Figure 1A qRT-PCR analysis of LINC00941 repression during keratinocyte differentiation in primary keratinocyte cultures from three different donors compared to undifferentiated keratinocytes (D0) (n = 6 biological replicates). Data is presented as mean ± SD.siPool mediated LINC00941 knockdown (B) in calcium-induced keratinocyte differentiation (n = 3 biological replicates/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).siPool mediated LINC00941 knockdown in calcium-induced keratinocyte differentiation, results in increased abundance of early and late differentiation marker transcripts on day 3 of differentiation (C) (n = 3 biological replicates/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).LINC00941 knockdown in day 3 (D3) organotypic epidermal tissue cultures (D) (n = 3-4 tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).LINC00941 knockdown in day 3 (D3) organotypic epidermal tissue cultures results in increased expression of key differentiation genes (E) (n = 3-4 tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).F Immunofluorescence analysis shows increased levels of early and late differentiation proteins. Collagen VII (col VII, green) stain indicates the basement membrane, nuclei are shown in blue and the differentiation proteins Keratin 10 and Loricrin are shown in red (n = 3-4 tissue cultures/knockdown group; one exemplary picture for each group is depicted). Scale bar: 50 µm.
Figure 2B LINC00941 knockdown efficiency (siLINC00941) in epidermal tissue on day 3 of differentiation as obtained by qRT-PCR measurements (n = 4-5 epidermal tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).C Heatmap of differentially expressed genes (padj < 0.05 and -1 > log2FC > 1) upon LINC00941 depletion on day 3 in organotypic epidermal tissue with marked keratinocyte differentiation genes (n = 4-5 epidermal tissue cultures/knockdown group).
Figure 3A Differentially expressed genes in day 3 LINC00941 depleted epidermal tissue cluster within the epidermal differentiation complex (EDC) (n = 4-5 biological replicates/knockdown group).B LINC00941 knockdown on day 3 in calcium-induced keratinocyte differentiation cultures results in increased expression of SPRR5 (FC = fold change) (n = 3 biological replicates/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).C Detected fragments per million (FPM) for SPRR5 in control (siCtrl) as well as LINC00941 deficient (siLINC00941) epidermal tissue for all biological replicates on day 3 (D3) of differentiation as obtained by DeSeq2 (FC = fold change) (n = 4‑5 epidermal tissue cultures/knockdown group).SPRR5 induction during the course of keratinocyte (KC) differentiation is shown by northern blot (D) for four different primary keratinocyte isolates and compared to undifferentiated keratinocytes (n = 8 biological replicates). Data is presented as mean ± SD.SPRR5 induction during the course of keratinocyte (KC) differentiation is shown by qRT-PCR analysis (E) for four different primary keratinocyte isolates and compared to undifferentiated keratinocytes (n = 8 biological replicates). Data is presented as mean ± SD.F p63 knockdown on day 3 of keratinocyte differentiation leads to decreased SPRR5 transcript levels (FC = fold change) (n = 3-4 biological replicates /knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).
Figure 4siPool-mediated SPRR5 knockdown on day 4 to 6 (D4-D6) of calcium-induced keratinocyte differentiation (A) (n = 3-5 cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).siPool-mediated SPRR5 knockdown on day 4 to 6 (D4-D6) of calcium-induced keratinocyte differentiation leads to decreased expression of key differentiation markers as shown by qRT-PCR (B) (FC = fold change) (n = 3-5 cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).siPool-mediated SPRR5 knockdown on day 4 to 6 (D4-D6) of calcium-induced keratinocyte differentiation leads to decreased expression of key differentiation markers as shown western blot analysis (C) (n = 3-5 cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).D SPRR5 knockdown efficiency in day 3 (D3) organotypic epidermal tissue (n = 4 epidermal tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).E SPRR5 depletion in regenerated organotypic epidermal tissue results in drastically reduced expression of differentiation proteins as shown by immunofluorescence analysis. Collagen VII (Col VII, green) stain indicates the basement membrane, nuclei are shown in blue and the differentiation proteins filaggrin and loricrin are shown in red (n = 4 tissue cultures/knockdown group; one exemplary picture for each group is depicted). Scale bar: 50 µm.F SPRR5 knockdown in regenerated epidermal tissue results in reduced transcript levels of key differentiation genes as obtained by qRT-PCR (n = 4 epidermal tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).
Figure 5B Overview of SPRR5 levels in control (siCtrl) and SPRR5 deficient (siSPRR5) epidermal tissue on day 3 and day 4 as obtained by qRT-PCR analysis (n = 3-5 epidermal tissue cultures/knockdown group). Data is presented as mean ± SD. Statistical significance was tested by an unpaired t-test and corrected for multiple testing after Bonferroni (* = adj. p-value < 0.05, ** = adj. p-value < 0.01, *** = adj. p‑value < 0.001, and n.s. = not significant).Heatmaps of differentially expressed genes (padj < 0.05 and -0.5 > log2FC > 0.5) upon SPRR5 depletion on day 3 (C) in organotypic epidermal tissue (n = 3-5 epidermal tissue cultures/knockdown group).Heatmaps of differentially expressed genes (padj < 0.05 and -0.5 > log2FC > 0.5) upon SPRR5 depletion on day 4 (D) in organotypic epidermal tissue (n = 3-5 epidermal tissue cultures/knockdown group).
Figure 1A HeLa-H2B/tub cells were transfected with control or TIAR siRNAs for 48 hours and synchronized by double thymidine (TT) block. After release from the block, mitotic cells were counted by fluorescence microscopy (mean ± SD; n = 3). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.B Time from S- to M-phase was measured in si-RNA transfected HeLa-H2B/tub cells by time-lapse microscopy following release from TT block (4 repeat experiments; all measurements depicted). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.Western blot analysis of unsynchronized HeLa-H2B/tub cells was carried out to monitor expression of p(S10)-H3, total H3 and TIAR in control and TIAR-depleted cells (mean ± SD; n = 3). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.D HeLa cells were transfected with control or TIAR si-RNAs, alone or together with Cdc25B siRNA. 72 hours after transfection, p(S10)-H3-positive cells were quantified by flow cytometry (mean ± SD; n = 3). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.HeLadox-YFP-TIARr cells were transfected with control or TIAR siRNAs, and 24h hours later cell were cultured in the abscence or presence of 1 μg/ml doxocycline for 48 hours. The expression of p(S10)-H3, total H3 and TIAR was measured by Westen blot analysis. The graph shows the quantification of p-H3 levels normalized to total H3 (mean ± SD, n = 4). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.F HeLadox-YFP-TIARr-RRM123m cells were analyzed as in panel (E) (mean ± SD, n = 4). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.G HeLadox-YFP-TIARr-dQRD cells were analyzed as in panel (E) (mean ± SD, n = 4). Data information: Statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.
Figure 2A Following transfection of HeLa cells with control or TIAR siRNAs for 72 hours, mitotic cells were analyzed by IF microscopy and scored for chromatin (mean ± SE, n = 3). B HeLa cells were analyzed as in (A) and scored for spindle defects (mean ± SE, n = 3). Data information: statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.C HeLa cells were transfected with control or TIAR siRNAs for 4 days, and subjected to colcemid for 2 hours prior to preparation of metaphase spreads. Chromosomes were stained with Hoechst (red) and anti-CENP-A antibody (green); the yellow arrowhead marks a chromosome break.D Metaphase spreads were prepared as in (C), and the frequency of cells with chromosomal breaks was quantified (mean ± SD, n = 3 independent experiments, approximately 30 metaphase spreads were assessed per experiment and condition). E Metaphase spreads were prepared as in (C), and the frequency of cells with scattered chromosomes was quantified (mean ± SD, n = 3). Data information statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.F HeLa cells were transfected with control or TIAR si-RNAs, alone or together with Cdc25B siRNA, and 4 days later subjected to colcemid for 2 hours prior to preparation of metaphase spreads. The frequency of cells with scattered chromatids was quantified (mean ± SD, n = 3 independent experiments, approximately 30 metaphase spreads were assessed per experiment and condition). G Metaphase spreads were prepared as in (F), and the frequency of cells with chromosomal breaks was quantified (mean ± SD, n = 3). Data information , statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.
Figure 3A HeLa cells were transfected with control or TIAR siRNAs for 48 hours prior to treatment with 0.4 µM APH. Cells were fixed at regular time intervals, and p(S10)-H3-positive cells were quantified by flow cytometry (mean ± SE, n = 3).B HeLa cells transfected with control or TIAR siRNAs were treated with APH for 24 hours. Pan-nuclear γH2AX signals were quantified by HTM (n = 3, 2000 cells examined per experiment and condition). Each dot represents the signal from one cell, horizontal lines indicate mean values, and the blue area delineates cells above an arbitrarily chosen threshold. Data information: statistical significance was determined by Wilcoxon rank-sum test. ; *, p < 0.05; **, p < 0.01; ***, p < 0.001; ****, p < 0.0001.C Chromatin-bound RPA2 signals were quantified by HTM HeLa cells transfected with control or TIAR siRNAs (n = 3, 600 cells examined per experiment and condition).D HeLa cells were transfected with control or TIAR siRNAs for 72 hours prior to treatment with ATRi (5 μM.) alone or together with Ro3306 (5 μM) for 12 hours. Pan-nuclear γH2AX signals were quantified by HTM (n = 3, 1000 cells examined per experiment and condition). Data information: statistical significance was determined by Wilcoxon rank-sum test. ; *, p < 0.05; **, p < 0.01; ***, p < 0.001; ****, p < 0.0001.E HeLa cells were transfected with control or TIAR siRNAs were treated with ATRi for 48 hours, and the sub-G1 population was quantified by flow cytometry following propidium iodide staining (mean ± SD, n = 3). Data information: statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001; ****, p < 0.0001.F HeLa cells transfected with control or TIAR siRNAs were treated with APH, alone or in combination with Gö6976 (1µg/ml) or UCN-01 (300 nM). After 24 hours, p(S10)-H3-positive cells were quantified by flow cytometry, and expressed relative to the values in the untreated condition (mean ± SE, n = 3). Data information: statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001; ****, p < 0.0001.
Figure 4A HeLa cells, untreated or treated for 24 hours with 0.4 µM APH, were fixed with methanol and analyzed by IF microscopy after staining with anti-p(S10)-H3 antibody, anti-TIAR antibody and DAPI. Yellow arrows mark focal accumulation of TIAR in GMGs.B IF microscopy was performed as in (A) to determine the intensity of the TIAR signal within GMGs (mean ± SD, n = 3 independent experiments, approximately 100 GMGs in 25 cells were analyzed per experiment and condition). C IF microscopy was performed as in (A) to determine the area of the TIAR signal within GMGs (mean ± SD, n = 3). Data information statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.D IF microscopy was performed as in (A) to quantify the percentage of late G2/prophase cells containing GMGs (mean ± SD, n = 3 independent experiments, 40 cells were analyzed per experiment and condition). Data information statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.E HeLa cells were processed for IF microscopy as in (A), images depict different cell cycle phases.HeLa cell were treated for 16 hours with (F) the CDK1 inhibitor Ro3306 (9 µM) prior to fixation with methanol and staining with anti-TIAR antibody and DAPI. The graphs show the percentage of late G2/prophase cells containing GMGs (mean ± SD, n = 3 independent experiments, 40 cells were analyzed per experiment and condition). Data information: statistical significance was determined by unpaired Student's t-test; *, p < 0.05; **, p < 0.01; ***, p < 0.001.HeLa cell were treated for 16 hours with (G) ICFR-193 (1 μM) prior to fixation with methanol and staining with anti-TIAR antibody and DAPI. The graphs show the percentage of late G2/prophase cells containing GMGs (mean ± SD, n = 3 independent experiments, 40 cells were analyzed per experiment and condition).
Figure 6A HeLa cells were treated with 0.4 µM APH for 24 hours, fixed and processed for IF microscopy after staining with anti-TIAR and anti-CDK1 antibodies. Intensity profiles along the white line in the merged image are presented on the right side; yellow arrows mark GMGs.B IF microscopy analysis as in (A) using anti-Cyclin B antibody.C HeLa cells transfected with control or TIAR siRNAs were treated with 0.4 µM APH 24 hours prior to fixation. Cells were processed for IF microscopy after staining with anti-PRP19 and anti-CDK1 antibodies. Intensity profiles from staining of the same cells with anti-TIAR and anti-CDK1 antibodies are depicted on the right side.D CDK1 was immunoprecipitated from HeLa cells transfected with control or TIAR siRNAs, tested for in vitro kinase activity using recombinant histone H1 as substrate, and visualized by Western blot analysis and autoradiography. The mean CDK1 activity ± SE was quantified from n = 5 experiments. Data information statistical significance was determined by unpaired Student's t-test. ; *, p < 0.05; ***, p < 0.001.E CDK2 activity was analyzed following immunoprecipitation as in (D) (mean ± SE, n = 3). Data information statistical significance was determined by unpaired Student's t-test. *, p < 0.05; ***, p < 0.001.F HeLa cells were transfected with control or TIAR siRNAs for 72 hours before measuring expression levels of p(S22)-Lamin A by Western blot analysis (mean ± SE, n = 3). Data information statistical significance was determined by unpaired Student's t-test. ; *, p < 0.05; ***, p < 0.001.G p(S22)-Lamin A levels were analyzed by HTM in si-RNA transfected HeLa cells (n = 3, 1000 cells examined per experiment and condition). Data information statistical significance was determined by Wilcoxon rank-sum test; *, p < 0.05; ***, p < 0.001.
Figure 1(A) BI‐1 WT and KO MEFs cells were stably transduced with retroviruses expressing cytochrome b5-GFP to visualize the ER (green). Then cells were stained with lysotracker (red) and observed with a confocal microscope. Nucleus was stained with Hoechst (blue). Scale bar: 30 μm.(B) BI‐1 WT and KO MEFs cells stimulated with EBSS for 3 h to induce autophagy. Acidic vesicles were visualized with a confocal microscope after lysotracker staining. Data represent the results of three independent experiments. Scale bar: 50 μm.(C) (a) Epifluorescence imaging of BI‐1 KO cells stained with lysotracker; (b) electron micrograph of the same field of cells shown in (a); (c-e), magnification of lysotracker‐positive vesicles in BI‐1 KO cells exposed to EBSS for 3 h and visualized with a fluorescent microscope (c) and the same field subsequently imaged by EM (d). Overlapping images are presented (e). Left panel: analysis of vesicular structures by EM with morphologies resembling early (f), intermediate (g) and late (h) autophagy vesicles.(D) Left panel: the distribution of endogenous LC3 was monitored by immunofluorescence and confocal microscopy in BI‐1 WT and KO MEFs cells at basal conditions (NT) or after exposure to EBSS for 3 h. Scale bar: left 15 μm and right 10 μm. Right panel: quantification of the number cells containing three or more LC3‐positive vesicles (N=160 cells). Mean and standard deviation are presented (N=4). Student's t‐test was used to analyse statistical significance, **P0.001 and *P0.01.(E) BI‐1 WT and KO cells were transiently transfected with an expression vector for a monomeric‐tandem LC3-RFP-GFP construct. After 24 h, cells were exposed to EBSS for 3 h. Autophagy fluxes were monitored in living cells by visualizing the distribution of LC3‐positive dots in the red and green channels using a confocal microscope. Scale bar: 10 μm. Right panel: quantification of the ratio between red and yellow dots per cell is presented. Mean and standard error of the analysis of 15 cells are shown.
Figure 2(A) BI‐1 WT and KO MEFs were treated with EBSS (left panel) or glucose/serum‐free RPMI media (right panel) for the indicated time points. Then, levels of LC3 were determined by western blot analysis. LC3‐I and LC3‐II forms are indicated. Hsp90 levels were assessed as loading control.(B) Quantification of LC3‐II levels relative to Hsp90 expression was performed in several experiments performed as presented in (A).(C)Cells were pre‐treated with a cocktail of lysosomal inhibitors (200 nM bafilomycin A1, 10 μg/ml pepstatin, and E64d; left panel) or 10 mM 3‐methyladenine (3‐MA; right panel) for 12 h and then exposed to starvation. LC3 levels monitored by western blot (D) and quantification of LC3‐II levels relative to Hsp90 were performed in the experimental conditions described in (C).(E) Basal autophagy flux was monitored in cells treated with a cocktail of lysosomal inhibitors (Lys. Inh.) in the presence of normal cell culture media. Right panel: quantification of independent experiments is presented.(F) BI‐1 KO cells were stably transduced with retroviruses expressing BI‐1-GFP or empty vector, and then levels of LC3‐II were assessed over time by western blot after exposure to EBSS. Right panel: as control, the levels of BI‐1-GFP were monitored by western blot. Hsp90 levels were used as loading control. In (B, D and E) mean and standard deviation are presented. Two‐way ANOVA was applied to analyse statistical significance. In parenthesis, the number of independent experiments for each time point is indicated. Student's t‐test was also used in (E) to analyse the statistical significance between each time point (*P0.001). In (B, D and E), normalization was performed as a ratio with the LC3‐II/Hsp90 normalized levels from non‐treated BI‐1 WT cells.