Figure 6Expression of Tardbp (left), total Sort1 (center) and exon 17b Sort1 (right) mRNAs quantified by Q-PCR in hippocampal neurons infected with Tardbp shRNA and mutant human TARDBP lentivirus constructs as indicated. Absolute levels of mouse Tardbp and human TARDBP mRNAs were determined using a standard curve and added together to assess total Tardbp mRNA levels relative to control uninfected cells after normalization to Gapdh mRNA. Results are presented as average ± SEM (N=3 independent experiments; n=3 wells per condition in each experiment). *, p<0.05; **, p<0.01. Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis. Western blots of cell lysates showing total TDP-43 expression in primary hippocampal neurons infected with Tardbp shRNA and mutant human TARDBP lentivirus constructs as indicated. The antibody used here detects both mouse and human TDP-43 proteins. GAPDH immunoblotting was used to control for equal loading. Molecular weights are noted in kDa. Bands corresponding to mouse and human TDP-43 are indicated. Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis. BDNF secretion induced by KCl treatment assessed by in-situ BDNF ELISA in cultured hippocampal neurons infected with Tardbp shRNA and mutant human TARDBP lentivirus constructs as indicated. Histogram bars show average ± SEM BDNF levels normalized to a standard curve (N=5 independent experiments; n=5 wells per condition in each experiment). *, p<0.05; ***, p<0.001 Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis. BDNF secretion induced by KCl treatment in cultured hippocampal neurons infected with Tardbp shRNA and mutant human TARDBP lentivirus constructs together with either EGFP or Sortilin rescue viruses. Histogram bars show average ± SEM BDNF levels normalized to a standard curve (N=5 independent experiments; n=5 wells per condition in each experiment). *, p<0.05; **, p<0.01. Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis. Expression of TARDBP (left), total SORT1 (center) and exon 17b SORT1 (right) mRNAs quantified by Q-PCR in human neurons derived from the indicated stem cells carrying either wild type Met337 (grey bars) or disease-associated Val337 (black bars) TARDBP alleles. Results are presented as average ± SEM (N=3 independent experiments; n=3 wells per condition in each experiment). *, p<0.05; **, p<0.01. Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis. BDNF secretion in stem-cell derived human neurons carrying wild type Met337or Val337 TARDBP alleles, infected with proBDNF lentivirus 5 days prior to depolarization by KCl treatment. Results are presented as average ± SEM (N=3 independent experiments; n=5 wells per condition in each experiment). **, p<0.01; ***, p<0.001. Data information: Results are presented as average ± standard error of the mean (SEM). All statistical tests were performed using 2-way ANOVA with Sidak post hoc analysis.