EMBO/SourceData huggingface dataset:
Figure 1(B) Identification of wild-type (WT), heterozygous (HZ), and knockout (KO) mice by PCR and agarose gel electrophoresis.(C) Immunoblotting (IB) of ENKD1 and α-tubulin in wild-type and Enkd1 knockout mice.(D-F) Immunofluorescence images (D) and quantification of the density of cilia (E, n = 20 fields from three mice) and ciliary length (F, n = 100 cilia from three mice) in mouse retinas stained with antibodies against acetylated α-tubulin (Ace-α-tubulin) and γ-tubulin and DAPI. Scale bar, 2 µm.(G-H) ERG recording images (G) and a-b wave amplitudes (H, n = 5 mice) show the difference in the ERG a-b wave amplitude between wild-type and Enkd1 knockout mice.(I-J) VEP recording images (I) and N2-P2 wave amplitudes (J, n = 5 mice) show the difference in the VEP N2-P2 wave amplitude between wild-type and Enkd1 knockout mice.(K-M) Immunofluorescence images (K) and quantification of the percentage of ciliated cells (L, n = 3 mice) and ciliary length (M, n = 100 cilia from three mice) in mouse kidneys stained with the antibody against acetylated α-tubulin and DAPI. To quantify the percentage of ciliated cells (L), >200 cells from 12 images were analyzed for each mouse. Scale bar, 3 µm.(N-Q) Images (N) and quantification of the percentage of flagellated sperm (O, n = 9 mice), flagellar length (P, n = 100 sperm from nine mice), and the percentage of sperm with normal motility among flagellated sperm (Q, n = 9 mice) for wild-type and Enkd1 knockout mice. To quantify the percentage of flagellated sperm (O), >200 sperm were analyzed for each mouse. To quantify the percentage of sperm with normal motility among flagellated sperm (Q), >200 flagellated sperm were analyzed for each mouse. In panel N, the arrows indicate two spermatozoa without tails. Scale bar, 50 µm.(R, S) Scanning electron microscopy images of cilia (R) and quantification of the percentage of ciliated cells (S, n = 9 mice) in the mouse tracheal epithelium. To quantify the percentage of ciliated cells (S), >200 cells from six fields were analyzed for each mouse. Scale bar, 5 µm.
Figure 2(A) Immunoblot analysis of ENKD1 and GAPDH in MEFs cultured in serum-free medium for 48 h.(B-D) Immunofluorescence images (B) and quantification of the percentage of ciliated cells (C, n = 3 independent experiments) and ciliary length (D, n = 70 cilia from three independent experiments) for MEFs cultured in serum-free medium and stained with antibodies against acetylated α-tubulin and γ-tubulin and DAPI. To quantify the percentage of ciliated cells (C), >100 cells were analyzed for each experiment. Scale bar, 5 µm.(E) Immunoblot analysis of ENKD1 and β-actin in RPE1 cells transfected with control or ENKD1 siRNAs and cultured in serum-free medium for 48 h.Immunofluorescence images (F) and quantification of the percentage of ciliated cells (G, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium, and stained with antibodies against acetylated α-tubulin and γ-tubulin and DAPI. To quantify the percentage of ciliated cells (G), >150 cells were analyzed for each experiment. Scale bar, 5 µm.quantification of ciliary length (H, n = 100 cilia from three independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium(I, J) Immunofluorescence images (I) and quantification of the percentage of ciliated cells (J, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium, and stained with antibodies against Arl13b and Centrin and DAPI. To quantify the percentage of ciliated cells (J), >80 cells were analyzed for each experiment. Scale bar, 2 µm.(K, L) Immunofluorescence images (K) and quantification of the percentage of ciliated cells (L, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs and plasmids expressing GFP, GFP-ENKD1, GFP-ENKD1-N, GFP-ENKD1-M, or GFP-ENKD1-C, cultured in serum-free medium, and stained with the antibody against acetylated α-tubulin and DAPI. The siRNA-resistant forms of ENKD1 were used for these rescue experiments. To quantify the percentage of ciliated cells (L), >120 cells were analyzed for each experiment. Scale bar, 3 µm.
Figure 3(A) Immunofluorescence images of RPE1 cells cultured in normal serum medium, and stained with antibodies against ENKD1 and Centrin and DAPI. Scale bar, 1 µm.(B) Immunofluorescence images and fluorescence intensity profiles of ENKD1 and CEP164 in serum-starved RPE1 cells. The arrow marks the centriole subjected to the line scan. Scale bar, 1 µm.(C) Immunofluorescence images and fluorescence intensity profiles of ENKD1 and Ninein in serum-starved RPE1 cells. The arrow marks the centriole subjected to the line scan. Scale bar, 2 µm.(D-F) 3D-SIM super-resolution images (D), quantification of the outer toroid diameters (E, n = 20 cells from three independent experiments), and a model illustrating the relative positions of γ-tubulin, Ninein, ENKD1, CEP164, CEP912, and Centrin (F) within a centriole. RPE1 cells were serum-starved and stained with antibodies against the indicated proteins. Scale bar, 1 µm.(G) Immunofluorescence images of RPE1 cells cultured in normal serum or serum-free medium, and stained with antibodies against ENKD1 and γ-tubulin and DAPI. Scale bar, 1 µm.(H) Immunofluorescence images of RPE1 cells cultured in serum-free medium, and stained with antibodies against ENKD1 and acetylated α-tubulin and DAPI. Scale bar, 1 µm.(I) Immunofluorescence images of RPE1 cells transfected with GFP-ENKD1 or GFP vector, cultured in a serum-starved condition, and stained with the antibody against acetylated α-tubulin and DAPI. Scale bar, 1 µm.(K) 3D-SIM images of ENKD1 localization at the centrosome in RPE1 cells cultured in serum-free medium (0, 12, 24, or 48 h of serum starvation), and stained with antibodies against ENKD1 and acetylated α-tubulin. Scale bar, 1 µm.
Figure 4Immunofluorescence images (B) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium, and stained with antibodies against CP110 and acetylated α-tubulin and DAPI.quantification of the percentage of cells with one CP110 dot (C, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs To quantify the percentage of cells with one CP110 dot (C), >120 cells were analyzed for each experiment.(D, E) Immunofluorescence images (D) and quantification of the percentage of cells with one CEP97 dot (E, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium, and stained with antibodies against CEP97 and acetylated α-tubulin and DAPI. To quantify the percentage of cells with one CEP97 dot (E), >150 cells were analyzed for each experiment. Scale bar, 1 µm.(F-H) Immunoblot analysis (F), immunofluorescence images (G), and quantification of the percentage of cells with one CP110 dot (H, n = 3 independent experiments) for RPE1 cells transfected with control or ENKD1 siRNAs, cultured in serum-free medium for 120 h, and stained with antibodies against CP110 and acetylated α-tubulin and DAPI. To quantify the percentage of cells with one CP110 dot (C), >80 cells were analyzed for each experiment. Scale bar, 1 µm.
Figure 5(A-C) Immunoblot analysis (A), immunofluorescence images (B) and quantification of the percentage of cells with one CP110 dot (C, n = 3 independent experiments) for RPE1 cells transfected with the indicated siRNAs, cultured in serum-free medium for 48 h, and stained with antibodies against CP110 and acetylated α-tubulin and DAPI. To quantify the percentage of cells with one CP110 dot (C), >180 cells were analyzed for each experiment. Scale bar, 1 µm.(D) Immunoblot analysis of CP110 and β-actin in RPE1 cells transfected with control or CP110 siRNAs and cultured in serum-free medium for 48 h.(E, F) Immunofluorescence images (E) and quantification of the percentage of ciliated cells (F, n = 3 independent experiments) for RPE1 cells transfected with the indicated siRNAs, cultured in a serum-starved condition, and stained with antibodies against γ-tubulin and acetylated α-tubulin and DAPI. To quantify the percentage of ciliated cells (F), >120 cells were analyzed for each experiment. Scale bar, 10 µm.(G, H) Immunoprecipitation and immunoblotting (G) and quantification (H, n = 3 mice) showing the CP110-CEP97 interaction in the retinal tissues of wild-type and Enkd1 knockout mice. The intensity of each CEP97 band was normalized to that of the β-actin band.(I, J) Immunoprecipitation and immunoblotting (I) and quantification (J, n = 3 independent experiments) showing the CP110-CEP97 interaction in serum-starved RPE1 cells transfected with control or ENKD1 siRNAs. The intensity of each CEP97 band was normalized to that of the β-actin band.
Figure 6(A) Immunoprecipitation and immunoblotting showing the interaction between endogenous ENKD1 and CP110 in mouse retinal tissues. Immunoprecipitation was performed with the anti-ENKD1 (upper panel) or anti-CP110 (lower panel) antibody or the corresponding control IgG.(B-D) Immunoprecipitation and immunoblotting showing the interaction of GFP-ENKD1 with Flag-CP110 (B and upper panel of D) or HA-CP110 (C and bottom panel of D) in HEK293T cells. Immunoprecipitation was performed with antibodies against GFP (B and C), Flag (upper panel of D), or HA (bottom panel of D).(E) Identification of the domains of ENKD1 mediating its interaction with CP110.(F) Identification of the domains of CP110 mediating its interaction with ENKD1.(H) GST pull-down showing the interaction of purified GST-CP110-N with purified His-ENKD1-M.(I, J) Immunoprecipitation and immunoblotting (I) and quantification (J, n = 3 independent experiments) showing the interaction of HA-CP110 with Flag-CEP97 in HEK293T cells transfected with the indicated plasmids. The intensity of each Flag-CEP97 band was normalized to that of the β-actin band.
Figure 1A. Evaluation of siRNA-mediated depletion. U2OS cells were treated with control, Plk4 or hSAS-6 siRNA and immunoblotting was performed with the indicated antibodies. Asterisk indicates non-specific bands. The positions of molecular weight markers (kDa) are shown on the right.B. U2OS cells were transfected with the indicated siRNAs. Cell peripheries are marked with dotted lines. Enlarged single cell images (marked with arrowheads in the top row) are shown at the bottom. Scale bars, 5 μm (bottom),10 μm (top).C, D, E. Quantification of the dispersion of satellite components upon depletion of Plk4 but not hSAS-6 knockdown. The results of PCM1 (C), hMsd1/SSX2IP (D) or BBS4 (E) are shown. Data represent the mean + SD (>200 cells, n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. **p<0.01, n.s. (not significant).F, G. U2OS cells were arrested in G1 and treated with control or Plk4 siRNA, followed by immunofluorescence microscopy by using indicated antibodies. Enlarged images (marked by arrowheads) are shown on the right. Quantification of PCM1 distribution is shown in G. >200 cells were counted and classified into two categories: normal (around and away from the centrosome) or dispersed. Data represent the mean + SD (n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. **p<0.01. Scale bar, 1 μm (F, right), 10 μm (F).H, I. siRNA-treated U2OS cells were transfected with empty vectors (EV) or plasmids containing Plk4 or siRNA-resistant Plk4-myc WT* or KD* and immunostained with the indicated antibodies. Cell peripheries are marked with solid lines, in which cells with yellow lines are successfully transfected (positive in myc signals), while those with white lines represent non-transfected cells. Quantification of PCM1 distribution is shown in I. Data represent the mean + SD (>200 cells, n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. ****p<0.0001, **p<0.01, n.s. (not significant). Scale bar, 5 μm (H).
Figure 2A, B. Either empty vector plasmids (EV) or those producing EGFP-PCM1 (A) or myc-Plk4 (B) were transfected into U2OS cells. Immunoprecipitation (IP) was performed with anti-GFP (A) or anti-myc antibodies (B), followed by immunoblotting with the indicated antibodies. DIC, the dynein intermediate chain.C. Bacterially expressed and purified His-PCM1 (a.a. 1-1128) was incubated with MBP alone or MBP-Plk4 (WT or KD) in vitro, and pulled down by magnetic beads coupled with an anti-MBP antibody, followed by staining with Coomassie Blue (left) or immunoblotting with an anti-His antibody (right). Asterisks show non-specific bands. The mobility difference between Plk4-WT and Plk4-KD was reported previously [43, 48]. We reproducibly observed the upward mobility shift of His-PCM1 upon binding to MBP-Plk4-WT, but not Plk4-KD.E. Total cell extracts were prepared from U2OS cells treated with PCM1 siRNA and transfected with RNAi-resistant EGFP-PCM1-WT*. Cells were cultured asynchronously (As) or arrested in G1, G2 or M phase, followed by immunoprecipitation with an anti-GFP antibodies. Pulled down samples were immunoblotted with the indicated antibodies.
Figure 3A, B, C, D. siRNA-treated U2OS cells (PCM1 for A and B; Plk4 for C and D) were transfected with plasmids producing various EGFP-PCM1 constructs (WT*, S372A*, S372D* or S372E*), fixed and stained with the indicated antibodies (arrowheads point to the centrosome) (A and C). Quantification data are shown in B and D. >200 cells were counted and classified into three categories: normal (around and away from the centrosome), aggregated or dispersed. Data represent the mean + SD (n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. ***p<0.001, **p<0.01, *p<0.05, n.s. (not significant). Note that the percentage of cells displaying "dispersed" is analysed. Scale bars, 5 μm (A and C).E. PCM1 siRNA-treated U2OS cells were transfected with two types of plasmids (EGFP- and mCherry-tagged) that produce PCM1-WT* and PCM1-S372A*. Immunoprecipitation and subsequent immunoblotting were performed with the indicated antibodies. Quantification data is shown on the right. Statistical analysis was performed using two-tailed unpaired student's t-tests. *p<0.05, **p<0.01, n.s. not significant.F. U2OS cells were treated with PCM1 siRNA and transfected with empty vectors (EV) or EGFP plasmids that produce PCM1-WT* or PCM1-S372A*. Immunoprecipitation was performed with an anti-GFP antibody, followed by immunoblotting with the indicated antibodies.
Figure 4A. Immunofluorescence microscopy was performed using the indicated antibodies in hTERT-RPE-1 cells treated with control, PCM1 or Plk4 siRNA. Regions around the basal body (insets) are enlarged on the right hand side. Scale bars, 5 μm (left) and 1 μm (right).B. Quantification. At least 150 cells were counted (n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. ***p<0.001, ****p<0.0001.C. hTERT-RPE-1 cells treated with PCM1 siRNA were transfected by an empty vector (EV) or plasmids producing PCM1-WT*, -S327A* or -S372E*, and immunofluorescence microscopy performed. Enlarged images of the regions around the basal body are shown in insets. Scale bars, 5 μm and 1 μm (inset).D. Quantification. At least 200 cells were counted (n=3). Statistical analysis was performed using two-tailed unpaired student's t-tests. *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001, n.s. not significant.
Figure 1(B) The active fragment of mTOR or active Akt2 was incubated with Flag-RagC WT purified from HEK-293E cells. The kinase reaction was performed in the presence or absence of mTOR inhibitor Torin or Akt inhibitor GDC-0068.(C) HEK-293E Cells were deprived of serum for 2 hr followed by insulin (100nM) stimulation for the indicated time. Lysates were analysed by Western blot for phosphorylation of RagC and proteins known to belong to the Akt and mTOR pathways. Graph shows mean of quantitative analyses of the Western blots after normalization for total protein or the loading controls.(D) HEK-293E cells were deprived of total amino acids for 1hr followed by addition of amino acids for the indicated time. Lysates were analysed by Western blot for phosphorylation of RagC and proteins known to belong to the Akt and mTOR pathways. Graph shows mean of quantitative analyses of the Western blots after normalization for total protein or the loading controls.(E) Control or iRapKO MEFs were treated with or without 2 μM 4-Hydroxytamoxifen (4-OHT) for 4 days to induce Raptor knockout. Treated cells were deprived of serum for 2 hr, followed by insulin (100 nM) stimulation for 10 min, and samples were analysed by Western blot.(F) SIN1 WT was expressed in SIN1 KO MEFs, and cells were selected by FACS. Cell lines were deprived of serum for 2 hr, followed by insulin (100 nM) stimulation for 10 min, and samples were analysed by Western blot.The active fragment of mTOR was incubated with Flag-RagC WT purified from HEK-293E cells. The kinase reaction was performed in the presence or absence of mTOR inhibitor Torin or Rapamycin. Samples were analysed by Mass Spectrum for pRagC T394The active fragment of mTOR was incubated with Flag-RagC WT purified from HEK-293E cells. The kinase reaction was performed in the presence or absence of mTOR inhibitor Torin or Rapamycin. Samples were analysed by Western blot for pRagC S21
Figure 3 (A) Expression of RagC WT, 3A, or 3E was induced by overnight addition of tetracycline in HeLa cells followed by cell size analysis using a particle size counter (Horizontal lines, box limits and whiskers represent the median, the 25th percentile ot the 75th percentile and the minimum to the maximum respectively. * p<0.05, # no significant difference, One-way ANOVA with Bonferroni multiple comparisons, n=4)  (B) Phospho-RagC positively regulates wing compartment size in Drosophila. Over-expression (OE) of dRagC WT, 3A, or 3E in wing posterior compartment using en-Gal4 driver and the posterior compartment sizes were measured in each genotype ((Horizontal lines, box limits and whiskers represent the median, the 25th percentile ot the 75th percentile and the minimum to the maximum respectively. ** p<0.01, *** p<0.001, **** p<0.0001, One-way ANOVA with Bonferroni multiple comparisons, n ≥ 63 flies per condition)  (C) Empty vector (EV), RagC WT, 3A or 3E were transiently expressed in stable RagC knockdown HEK-293E cells followed by cell size analysis using a particle size counter (Horizontal lines, box limits and whiskers represent the median, the 25th percentile ot the 75th percentile and the minimum to the maximum respectively. * p<0.05, ** p<0.01, **** p<0.0001, # no significant difference, One-way ANOVA with Bonferroni multiple comparisons, n=2 for C2 and n=4 for other conditions)  (D) Empty vector (EV), HA-RagC WT, 3A or 3E were expressed in HEK-293E cells followed 48 hr later by incubation with DMEM in the presence or absence of serum for 4 hr. Lysates were analyzed by Western blot for phosphorylation of ULK1 and total ULK1 (E) Empty vector (EV), HA-RagC WT, 3A or 3E were expressed in HEK-293E cells followed 48 hr later by incubation with DMEM in the presence or absence of serum for 4 hr. Chloroquine (100μM) was added to media 30 min prior to harvest. Lysates were analyzed by Western blot for levels of LC3-II and 14-3-3.Graphs show mean ± S.E.M. of quantitative analyses of LC3-II blotting after normalization for 14-3-3. * p<0.05, two tailed Student's t test, n=4  (F) GFP-LC3 was co-expressed with empty vector, RagC WT, 3A or 3E in HEK-293E cells followed 48 hr later by serum deprivation for 4 hr. Chloroquine (100μM) was added to media 30 min prior to harvest. LC3 and RagC were monitored by confocal fluorescence microscopy. Scale bar, 10 µm  (G) Quantitative analysis of GFP puncta (F) (**** p<0.0001, two tailed Student's t test; n ≥ 21). Mean value is shown as a horizontal bar
Figure 1Figure 1. Identification of non-canonical p53 binding sites in human subtelomeres. (A and B) ChIP-seq tracks for p53 in camptothecin (CPT) treated or untreated HCT116 cells were aligned with RNAPII, CTCF, RAD21, and SMC1 for human chromosome18q (A) or 13q (B) subtelomeres. Position relative to the centromeric end of the terminal TTAGGG repeat tract are indicated in bp at the top. Subtelomeric DNA paralogy segment tracks, internal telomere-like sequence tracks (red CCCTAA), and annotated RefSeq gene tracks are indicated above the ChIP-seq tracks. (C) Alignment of human subtelomeric elements containing non-canonical p53 recognition sequences. The position of the RepeatMasker-defined LTR10c element is shown; also note the (TG)n microsatellite repeat adjacent to the p53 binding site. (D) Schematic organization of non-canonical p53 binding sites found in human subtelomeres.
Figure 2Stress-induced p53 binding at human subtelomeres. (A) Western blot of HCT116 p53-/- and p53+/+ cells treated with DMSO (D) or 50 µM etoposide (E) for 24 hrs. Cell lysates were assayed for total p53, phospho-Ser15 p53 (p-p53), γH2AX, or GAPDH.(B) ChIP-qPCR was assayed in HCT116 p53-/- or p53 +/+ cells treated with DMSO or etoposide as in panel A, and assayed by ChIP with antibodies to p53 (Ab6) or control IgG, followed by qPCR for p53 binding site in subtelomere 18q (top panel) or 13q (lower panel).(C) HCT116 p53-/- and p53+/+ cells were cultured in DMEM with 10% FBS or Hank's buffered saline solution (HBSS) lacking FBS and then assayed by ChIP with either IgG control (grey) or two different p53-specific antibodies Ab6 (red) or FL(black). ChIP was assayed by qPCR with primers proximal to p53 binding sites at 18q, 13q, or p21 promoter.. (D) Doxycyclin (Dox)-inducible p53 H1299 cells were treated without (-) or with (+) Dox in media containing 10% serum or in serum free HBSS, and then subject to ChIP assay with control IgG or p53-specific Ab6 antibody. ChIP DNA was assayed by qPCR using primers specific for p53 binding site at p21 (top panel), p53-negative control IGX1A (middle panel), or p21 positive control (lower panel). Error bars represent SD, and * indicates p value < .05. p-values were determined by Student t-test.
Figure 3. Transcriptional activity of subtelomeric p53-response elements. (A) Luciferase test constructs containing either empty test vector (top), p53-response elements from 18q subtelomere (middle) or MDM2 promoter (lower) were assayed in HCT p53-/- cells transfected with two independent preparations of empty vector or p53 WT expression vector.(B) RT-qPCR measure of p21 (top panel) or PARD6G (lower panel) in HCT116 p53-/- or p53+/+ cells after treatment with DMSO or 50 µM etoposide.(C) RT-qPCR analysis of TERRA transcripts from subtelomere 13q (upper) or 2q (lower).(D) RT-qPCR analysis of TERRA transcripts from 18q using two independent primer sets pr1 (top panel) or pr2 (lower panel) from HCT116 p53+/+ cells cultured with serum (grey bars) or in HBSS lacking serum (black bars). Error bars represent SD and * indicates p value <.05 using student t-test comparing treated and untreated samples.