EMBO/SourceData huggingface dataset:
Figure 3B. qRT-PCR expression analysis of lncMN2-203 isoform, lncMN2-202/204, miR-325-3p and miR-384-5p embedded miRNAs in WT, ∆SP1 and ∆SP2 EB6. Data, that are expressed as mean (error bars represent SD), are normalized over Atp5o mRNA levels (for lncRNA isoform quantification) or over snoRNA U25 levels (for miRNA quantification) and are reported as RNA fold over the control (mESC), set as 1. N=3 biological replicates. Data are expressed as mean and error bars represent SD. Data information: histogram dots represent single fields replicates. *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001, n.s.> 0.05 (two-tailed, unpaired Student's t-test).C. Cytofluorimetric analysis of cells from dissociated EB6. The right diagram reports the cell distribution (percentage of the peak) according to GFP levels, from WT (gray line), ∆SP1 (purple line) and ∆SP2 (blue line) EB6. In the histogram aside, the percentage of GFP+ cells in WT, ∆SP1 and ∆SP2 is reported. Data are expressed as mean and error bars represent SD. N=3 biological replicates. Data are expressed as mean and error bars represent SD. Data information: histogram dots represent single fields replicates. *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.001, n.s.> 0.05 (two-tailed, unpaired Student's t-test).D. Left: representative immunofluorescence of the MN marker Isl1 (red signals) in cells maintained in vitro for 14 days after EB6 dissociation (DIV14). DAPI counterstaining in blue. Scale bar=100 mm. Right: box plot shows the distribution of Isl1+ nuclei with respect to the total cell number marked with DAPI staining in WT and in ∆SP mutants (clone 1 and clone 2). The central band represents median and the whiskers represent the distribution that goes from the minimum value to the lower quartile and than from the upper quartile to the maximum value. N=3 biological replicates and 10 fields were analyzed for each replicate. Data are expressed as mean and error bars represent SD. Scale bar=100 mm. Data information: histogram dots represent single fields replicates. *P ≤
Figure 1B-E) Representaitve pictures showing that the withdrawal of dietary leu but not his significantly reduced stem cells and follicle cell proliferation (pH3, red) in the adult ovary after 10 days, quantified in (E) (n=13, 14,13), scale bar = 100 μm.withdrawal of dietary leu but not his significantly reduced stem cells and follicle cell proliferation (pH3, red) in the adult ovary after 10 days, quantified in (E) (n=13, 14,13), scale bar = 100 μm.wildtype larval NB clonal growth was significantly reduced after 6 days of dietary leucine depletion (25% leu), and significantly increased by dietary histidine depletion (25% his), quantified in (F) (n=28,22,7), scale bar = 50 μmF-H) Representaitve pictures showing that wildtype larval NB clonal growth was significantly reduced after 6 days of dietary leucine depletion (25% leu), and significantly increased by dietary histidine depletion (25% his),I-K) Representaitve pictures showing that adult nerfin-1 clonal growth was significantly reduced on -his diet compared to CDD (measured at day 0, and day 9) quantified in (K) (n= 27, 110, 136). Scale bar = 75μm. ***p<0.001 L-N) Representaitve pictures showing that larval nerfin-1 clonal growth was significantly reduced on 25% his diet compared to CDD (after 6 days), quantified in (N) (n=53,36). Scale bar = 50 μm. O-Q) Representaitve pictures showing that adult pros clonal growth was not significantly altered on -his diet compared to CDD (after 7 days), quantified in (Q) (n = 12, 23,16). Scale bar = 75μm. R-T) Representaitve pictures showing that larval pros clonal growth was not significantly altered by dietary histidine reduction (25% his) compared to CDD (after 6 days), quantified in (T) (n=19,13). Scale bar = 50 μm. U-W) Representative pictures showing that the growth of larval type II lineages overexpressing NACT was significantly reduced dietary histidine reduction (25% his) compared to CDD, quantified in (W) (n=27,19). Scale bar = 100 μm.
Figure 2B) Concentration of histidine and 3-methyl-L-histidine from whole Drosophila adults extracts measured by 1H NMR after 3 days of feeding on either CDD or -his diet (n=3,3). Both compounds are reduced to below detection levels (<0.3mM) upon dietary his depletion.C) Dietary supplementation of 3-methyl-L-his for 4 days significantly increased adult nerfin-1 clonal growth, and rescued nerfin-1 growth inhibition due to his dietary withdrawal (n =18,14, 7,9).D) Dietary supplementation of histamine does not significantly increase adult nerfin-1 clone size, but can rescue nerfin-1 clonal growth inhibition due to his dietary withdrawal (n =42,14,23,25).E) Larval nerfin-1 clonal growth is significantly decreased upon overexpression of HDC RNAi (n=23,36).G) Hdc inhibition significantly reduced the percentage of Dpn+ NBs (n=16,17), and significantly increased the percentage of Elav+ neurons per clone (n=16,17).H) HdcRi overexpression reduced cellular growth of nerfin-1 NBs (n=17,19) and neurons (n=36,19) measured as the ratio of nucleolus/nuclear volume.
Figure 3A-E) Representative images of nerfin-1 clones in the adult VNC after 6 days of feeding on CDD or -his diet, scale bar = 100μm. Histidine dietary withdrawal resulted in clones significantly altering the amount of cell death per clone quantified in (C) (n = 6, 7).Histidine dietary withdrawal resulted in clones containing significantly more differentiated Elav+ neurons (red) quantified in (D) (n = 16,17) and significantly fewer Mira+ NBs (blue), quantified in (E) (n = 12,22),F-G) Larval nerfin-1 clones consisted of significantly greater proportion of differentiated neurons (n=10,7) and significantly reduced proportion of NBs per clone upon his dietary depletion (25% his, n=9,11).Representative images of adult nerfin-1 (I-J', green ) and pros clones (K-L', green), scale bar = 5μm. In nerfin-1 clones, the size of the NBs (Ase+, blue) was significantly reduced upon 6 days of histidine dietary withdrawal, quantified in (H) (n=33,20). In pros clones, the size of the NBs (Ase+ blue), and cellular growth measured as the ratio of nucleolus (Fib, white)/nuclear (Ase, blue) volume was not significantly altered upon 6 days of histidine dietary withdrawal, quantified in (H) (n=9,8)Cellular growth measured as the ratio of nucleolus (Fib, white)/nuclear (Ase, blue) volume was also significantly reduced, quantified in (M) (n=33,20).Cellular growth measured as the ratio of nucleolus /nuclear volume was significantly reduced in larval nerfin-1 NBs after 6 days his dietary reduction (25% his compared to CDD, n=14,6) quantified in (N).In pros clones, the size of the NBs (Ase+ blue), and cellular growth measured as the ratio of nucleolus (Fib, white)/nuclear (Ase, blue) volume was not significantly altered upon 6 days of histidine dietary withdrawal, quantified in (O) (n=9,7).Panel (P) shows that the larval nerfin-1 neuron to NB reversion requires 15-fold increase in cellular volume (n=10) and pros GMC to NB reversion requires approximately 3.5-fold increase in cellular volume (n=31).
Figure 4A-D) Representative pictures showing that pros NBs and GMCs are smaller than wildtype (NBs and GMCs are distinguished at telophase, as a doublet of unequal size), quantified in C (n=25,31,21,16). pros NBs exhibit similar nucleolus /nuclear ratio (white arrows, nucleolus marked by Fib) compared to wild type and pros;TorDN NBs, quantified in D (n=10,18,15).E-F) Representative pictures showing pros clones (green) generated in myc hypomorphic background did not significantly alter pros nucleolus/nuclear ratio (E-F)pros clones (green) generated in myc hypomorphic background did not significantly alter pros nucleolus/nuclear ratio (E-F), nucleolus labelled with Fib (red) [quantified in G (n=44,43)], clone size [quantified in H (n=41,34)], or the proportion of Dpn+ NBs and Elav+ neurons per clone [quantified in I (n=15,15,15,15)].J-K) Representative pictures showing that nerfin-1 clones (green) generated in myc hypomorphic background (J-K)nerfin-1 clones (green) generated in myc hypomorphic background (J-K) exhibited significantly reduced nucleolus/nuclear ratio, [nucleolus labelled with Fib (red)] and reduced clone size, quantified in L (n=34,27) and M (n= 106,75), and displayed an increased proportion of differentiated Elav+ neurons, and reduced proportion of Dpn+ NBs per clone, quantified in N (n=20,20,20,20). scale bar =10μmO) Reducing Myc dosage with the hypomorphic Myc allele, mycP0, abolished the increase in nerfin-1 clone size mediated by 2x histidine dietary intake, 2x his (n=41,18,10,57).P) Overexpression of myc restored the growth of nerfin-1 clones inhibited by histidine dietary reduction, 25% his (n=51,36,39,29).Q, R) pros (Q) and nerfin-1 (R) clones are reduced upon Tor inhibition (n=22,63) compared to control (n=51,65), but their growth differentially depend on amino acid transporter Slif ( n=12,32) and downstream growth regulators eIF4E (n= 21,47) and S6K (n=39,37).
Figure 1, Maximum intensity projections of confocal z-stacks taken from the apical cochlear region of control (A) mice at postnatal day 11. Inner hair cells (IHCs) were stained with antibodies against Kir2.1 (green) and the hair cell marker MYO7a (blue). At least 3 mice for each genotype were used.C, D, Currents from IHCs of control (C, P9) and Kir2.1-OE (D, P10) pre-hearing mice. Currents were elicited by using depolarizing and hyperpolarizing voltage steps, with a nominal increment of 10 mV, from a holding potential of −84 mV. Test potentials are shown next to some of the traces. Note that the large inward rectifier Kir2.1 current is only present in the IHC of the Kir2.1-OE mouse (D). The outward current is primarily carried by a delayed rectifier current IK. IK1 identifies the small inwardly rectifying K+ current normally expressed in IHCs. E, Steady-state current-voltage curves obtained from IHCs of control (P9-P11) and Kir2.1-OE (P9-P11) mice.
Figure 2F, G, Representative ∆F/F0 traces from the IHCs and GER of P7-P9 control (F) and Kir2.1-OE (G) mice in the presence of 0.3 mM Ca2+. Spontaneous ATP-dependent Ca2+ waves from the GER (green traces) were eliciting coordinated Ca2+ signals in the IHCs from both controls and Kir2.1-OE mice. For each genotype, two separate sets of recordings from 2 mice are shown (top and bottom right), with the top traces being linked to the images on the left: before [1], during [2] and after [3]) the generation of a large Ca2+ wave from the GER. For details about the frequency and duration of the Ca2+ waves, and the number of mice and recordings see Fig EV3. All recordings were obtained at body temperature. Traces are computed as pixel averages of regions of interest centred on IHCs.
Figure 3C, Peak-to-peak MET current-voltage curves from P6-P7 apical-coil IHCs of 7 control (12 IHCs) and 3 littermates Kir2.1-OE mice (7 IHCs). Recordings were obtained by mechanically stimulating the hair bundles of IHCs at the same time as stepping their membrane potential from −124 mV to +96 mV in 20 mV increments. The two sets of data are not significantly different: P = 0.6320, 2-way ANOVA.
Figure 4C, Peak-to-peak MET current-voltage curves from P8-P9 apical-coil IHCs of 12 control (17 IHCs) and 13 littermates Kir2.1-OE mice (24 IHCs). The two sets of data are significantly different: P < 0.0001, 2-way ANOVA.J, Example of FM1-43 uptake by IHCs from P11 control (top) and Kir2.1-OE (bottom) mice, showing the lack of fluorescence labelling in the latter, which is an indication of the lack of MET channels open at rest at this stage in the IHCs overexpressing the Kir2.1 channels. At least 3 mice for each genotype were used.
Figure 5A, B, Scanning electron microscope (SEM) images showing the IHC hair bundle structure in the apical coil of the cochlea of P11 control (A) and P8-P11 Kir2.1-OE (B) mice. Control IHCs and the large majority of P8 IHCs from Kir2.1-OE mice show a normal hair bundle structure composed of three rows of stereocilia: tall, intermediate and short (arrows). From about P9 in Kir2.1-OE mice, some IHCs start to lose the third row of stereocilia (arrowheads) and some already exhibit some fusion of the stereocilia (asterisk). These changes in hair-bundle structure became more prominent at P11. At least 3 mice for each genotype were used. In these panels and those below, asterisks are used to define some of the abnormal hair bundles.C, D, SEM images of both IHCs and OHCs from the cochlea of P26 control (C, upper panel) and P26 Kir2.1-OE (D, upper panel) mice. Lower panels show a higher-magnification view of the hair bundle of IHCs from both genotypes, highlighting the profound disruption of the stereocilia in IHCs overexpressing Kir2.1 channels. At least 3 mice for each genotype were used.
Figure 6A,B, Maximum intensity projections of confocal z-stacks showing images of the hair bundles from apical-coil IHCs of P6 and P11 control (A) and Kir2.1-OE (B) mice immunostained with antibodies against MYOSIN VI (blue) and EPS8 (magenta). At least 3 mice for each genotype were used. In all panels (A-D), stereocilia are labelled with phalloidin (green). Note that despite the disrupted hair-bundle structure in the IHCs overexpressing Kir2.1 channels; the stereocilia retained a normal distribution of these bundle proteins. At least 3 mice for each genotype were used.C,D, Confocal images of the hair bundles of P11 IHCs from control (C) and Kir2.1-OE (D) mice immunostained with antibodies against MYOSIN XV isoform 1 (blue) and WHIRLIN (magenta). In all panels (A-D), stereocilia are labelled with phalloidin (green). Note that despite the disrupted hair-bundle structure in the IHCs overexpressing Kir2.1 channels; the stereocilia retained a normal distribution of these bundle proteins. At least 3 mice for each genotype were used.
Figure 7A,B, Maximum intensity projections of confocal z-stacks showing the IHCs of the apical cochlear region from control (A) and Kir2.1-OE (B) pups with the females being in the continuous presence of DOX in the drinking water from conception up to when the pups were P5 (upper panels). Middle and bottom panels show IHCs at P7 and P14 following the removal of DOX at P5 for both control (A) and Kir2.1-OE mice (B). IHCs were stained with antibodies against the K+ channel Kir2.1 (green) and Myosin 7a (Myo7a, blue: cell marker). Note that after 2 days following the removal of DOX, Kir2.1overexpression was already largely downregulated. At least 3 mice for each genotype were used.H,I, Maximum intensity projections of confocal z-stacks showing images of the hair bundles from apical-coil IHCs of P14 control (H) and Kir2.1-OE (I) mice stained with phalloidin. DOX was removed from the mother's drinking water when the pups were P5. At least 3 mice for each genotype were used.J,K, SEM images showing the normal structure of the hair bundles of the IHCs in the apical coil of the cochlea of P14 control (J) and P14 Kir2.1-OE (K) mice. DOX was removed from the mother's drinking water when the pups were P5. Note that the morphological profile of the hair bundles in IHCs is comparable between control and Kir2.1-OE mice, indicating that the removal of the intrinsic Ca2+ action potentials prior to the second postnatal week has no effect on the mechanoelectrical transduction apparatus. At least 3 mice for each genotype were used.
Figure 8D, Heatmap of the counts for each RNA-library for the 118 genes associated with microtubule or cytoskeletal processes. Each row is z-scored. 118 genes were all differentially expressed as per previous analysis.
Figure 1(A) ADAR2 is most strongly expressed in vascular tissues. Graph showing ADAR2 gene expression data derived from GTEx for few representative human tissues. Note the highest expression of ADAR2 in the tibial artery followed by colon and esophagus. Boxes represent the 25th and the 75th percentile with median represented by the black line in the box. The whiskers depict the minimum and the maximum value.(B) FLNA gene expression in few representative human tissues from >500 different donors using GTEx data. Tibial artery, colon and esophagus show highest gene expression similar to ADAR2 expression. Boxes represent the 25th and the 75th percentile with median represented by the black line in the box. The whiskers depict the minimum and the maximum value.(C) Bar graph shows FLNA RNA editing (%) among few representative human tissues. Note very high editing levels in the arterial system (red bars).(D) Scatter plot shows the log fold change in editing levels of several candidates between ventricles of healthy donors and heart samples of cardiomyopathy patients. FLNA marked in the graph is one significant discriminator. Y axis is the -log 10 of the p value for the difference between healthy and sick. The colors (red vs green) reflect the threshold cutoffs randomly assigned to distinguish the sites, which demonstrate large, highly significant differences between the two groups. Fold change cutoff of 0.9 was used.(E) Scatter plot shows the FLNA RNA editing in control and diseased human tibial arteries and aorta. At least 4 control and 7 diseased human donors were used in each case. P value <0.05 measured by t test was considered significant.
Figure 2(A) Scheme showing the FLNA wild-type (wt) allele, the targeting vector and the FLNAΔECS neo-allele. The loxP flanked PGK-neo cassette in the targeting vector replaced the editing complementary sequence (ECS) using homologous recombination, which was then deleted using Cre recombinase. Right, southern blotting analysis screened for positive clones shown. The positions of loxP sites, restriction enzyme (EcoRI) and Southern blotting probe are also indicated.(B) Sequencing electropherograms show the average FLNA editing levels in wt and FLNAΔECS tissues (Stomach, colon, heart, lung and tibial artery). Editing levels were checked in tissues from 3 independent mice and the value below the chromatogram depict the average value of 3 replicates. Data information: Arrows indicate the FLNA editing site.(C) FLNA mRNA expression levels measured by qPCR in wt and FLNAΔECS colon tissue showed no difference. Data information: data shown as mean ± SD from three independent experiments. ** P<0.05(D) FLNA protein levels measured by western blotting are identical in wt and FLNAΔECS stomach tissue. Y-axis represents FLNA expression normalized to tubulin levels. Data information: data shown as mean ± SD from three independent experiments. ** P<0.05(E) FLNA editing levels (%) in wt whole dorsal aorta, tunica media and tunica adventitia. Tunica media consisting of smooth muscle cells show the highest FLNA RNA editing. Data information: Arrows indicate the FLNA editing site. data shown as mean ± SD from three independent experiments. ** P<0.05
Figure 3A,B) Treatment of aortic rings with thromboxane A2 receptor agonist U46619 leads to (A) hypercontraction and (B) increased contraction force in FLNAΔECS aortae in myograph chambers. Emax was higher in FLNAΔECS aortae without any difference in EC50 as compared to wt aortae. For each condition, 10-12 aortic rings from at least 4 wild-type (wt) and 4 FLNAΔECS mice were used. Data shown as mean ± SEM. * P<0.05, ** P<0.01, *** P<0.001 (Student's t test)(C) Graph shows the normalized cell contraction measured by Xcelligence Real time cell analyzer in wt (red) and FLNAΔECS (green) primary vascular smooth muscle cells (vSMC) indicating hypercontraction in FLNAΔECS cells in response to 10μM U46619. Data shown as mean ± SD from three independent experiments.(D) Quantification of cell index measurements plotted as percentage of contraction following different concentrations of U46619. Data shown as mean ± SD from three independent experiments. P value <0.05 (Student's t test) was considered significant. The difference between wt and FLNAΔECS was significant at every concentration of U46619.
Figure 4(A) Myosin light chain phosphorylation detected by a phospho-specific antibody (pMLC) and normalized to total myosin light chain (MLC). Tubulin served as a loading control. Quantification shows a significant increase in pMLC in FLNAΔECS vSMCs. Data information data shown as mean ± SD from at least three independent experiments. ** P<0.05 (Student's t test)(B) Rhotekin Pull down activation assay was performed on wt and FLNAΔECS vSMC lysates and activated (GTP) bound RhoA was compared between the 2 genotypes. FLNAΔECS vSMCs show more GTP-loaded RhoA than wt vSMCs. Tubulin was used as a loading control. Data information: data shown as mean ± SD from at least three independent experiments. ** P<0.05 (Student's t test)(C) Thromoboxane A2 stimulation with U46619 increased phosphorylation of myosin light chain phosphatase (pMYPT1) in FLNAΔECS vSMCs as shown by western blotting on vSMC lysates with phosphor-specific MYPT1 antibody. Data information: data shown as mean ± SD from at least three independent experiments. ** P<0.05 (Student's t test)(D) CPI17 phosphorylation levels were measured in wt and FLNAΔECS vSMCs in untreated cells and in the presence of ROCK and PKC inhibitor using pCPI17 antibody. Data information: data shown as mean ± SD from at least three independent experiments. ** P<0.05 (Student's t test)
Figure 5A-C) Telemetry measurements were done on mice continuously for 72 hrs and reading was recorded every minute to analyse blood pressure in wt and FLNAΔECS mice. Scatter plots show diastolic blood pressure over 72 hrs (A), diastolic blood pressure during inactive phase (B) and diastolic pressure during active phase (C). Note: Significant increase in diastolic blood pressure in FLNAΔECS mice during the inactive phase. 9 mice (5 males marked as square + 4 females marked as round) were analyzed for each genotype. Data shown as mean ± SEM. P value <0.05 (Student's t test) was considered significant. Boxes represent the 25th and the 75th percentile with median represented by the black line in the box. The whiskers depict the minimum and the maximum value.
Figure 6(A) Dorsal aortae were fixed, cross-sectioned and then stained with Elastica van Gieson stain to visualize collagen around the blood vessel. 6 independent mice (5-6 months) of each genotype were used for the analysis. Scale bar: 50 μm. (B) Plot shows individual data points (black-wt, red-mutant) of adventitial area in both the genotypes. Measurements show increased adventitial area in FLNAΔECS aortae. P value <0.05 was considered significant (Student's t test) (C) Representative heart sections of a 5-6 months old mice stained with Masson Trichrome shows increased collagen (blue) around coronary vessels (marked by arrowheads) Scale bar: 50 μm. (D) Quantification shows a significant increase in perivascular fibrosis in FLNAΔECS hearts. Four sections from each heart were measured. Four mice analyzed for each genotype. P value <0.05 considered significant. (mixed model approach) (E) Representative longitudinal heart sections stained with H&E staining (RV: right ventricle, LV: left ventricle). Black lines represent thickness of interventricular (IVS) and lateral left ventricular wall (LLVH). Scale bar: 1mm. (F) Scatter graph shows increased ventricular wall thickness in FlnAΔECS mice hearts. Six male mice (6months old) analyzed for each genotype. P value <0.05 was considered significant. (Student's t test)(G) Heart cross-sections were stained with FITC-WGA (Wheat germ agglutinin) to visualize cell membranes of cardiomyocytes. Scale bar: 20 μm. (H) Respective cell areas measured by Image J software and represented by box plots for each animal (six per genotype). Boxes represent the 25th and the 75th percentile with median represented by the black line in the box. The whiskers depict the minimum and the maximum value. P value <0.05 (mixed model approach) was considered significant.
Figure 7(A) Graph showing the individual blood velocity profile determined by MRI over time in 4 wt mice (shades of grey) and 5 FLNAΔECS mice (shades of red). The mouse shown in dotted purple line is clearly an outlier within the FLNAΔECS cohort. Aortic velocity waveform represents velocity during different stages of cardiac cycle. A significant reduction of velocity was observed at 40ms in the systolic cycle.(B) Representative wt (top) and FLNAΔECS (below) mouse showing the blood flow just above the aortic valve. Note: Reduced blood flow in FLNAΔECS mouse as depicted by pseudocoloring. The red circle represents the time window at which the images are shown.