Journal: bioRxiv
Article Title: Suppressive Genetic Interactions Between Haploinsufficient Mitochondrial Genes Encoded in the 22q11.2 Microdeletion Locus Define Brain and Cardiac Phenotypes
doi: 10.64898/2026.01.09.698677
Figure Lengend Snippet: A. Proteins of the SLC25A1 interactome according to Gokhale et al . Edges were defined by the proximity ligation mitochondrial interactome according to Antonicka et al. . B. MRPL40 and SLC25A1 immunoblots of wild type and MRPL40 null cell lines. C. Immunoblot of respiratory chain proteins encoded by the mitochondrial genome. D. Immunoblot of mitochondrial ribosome subunits. All subunits, except for MRPL44, are depicted in the SLC25A1 interactome. E. Immunoblot of SLC25A1 interactome proteins involved in acetyl-CoA and lipid metabolism. F. Immunoblot of RNA binding proteins present in the SLC25A1 interactome. HSP90 and ACTB were used as controls for B-F. G . Quantification of blots in panels B-F. Depicted is the ratio between mutant and wild type. Each dot represents an independent clone and/or independent experiment. p values were obtained with unpaired mean difference two-sided permutation t-test (italicized numbers represent p values). H . Metabolic activity in wild type and MRPL40 KO cells measured by the Seahorse Mito Stress Test (n=8 of each genotype). Oxygen consumption and extracellular acidification rates, OCR and ECAR, data are presented normalized to protein and analyzed by unpaired mean difference two-sided permutation t-test (italicized numbers represent p values). Basal, ATP-dependent, and maximal respiration were determined as described. Arrows indicate the sequential addition of oligomycin, FCCP and rotenone-antimycin. I. qRT-PCR quantification of mitochondrial rRNAs RNR1-2 and vimentin as control. Unpaired mean difference two-sided permutation t-test, n=3. J . Nanostring quantification of nuclear encoded and mitochondrial encoded RNAs. Junctions represent non-processed intermediaries derived from the polycistronic mitochondrial RNA. p values two-sided t test. Wild type n=6 and KO n=3. K . Immunofluorescent microscopy of with type and MRPL40 KO cells labeled for TOM20 and dsRNA. Scale bars correspond to 10 and 2.5 µm. Probability plot depicts the levels of dsRNA signal in 16 wild type and 20 MRPL40 KO cells. Kolmogorov-Smirnov test. L . Quantification of the ratio of mitochondrial and nuclear genomes. Unpaired mean difference two-sided permutation t-test. Wild type n=16 and KO n=20 cells.
Article Snippet: To generate stable cell lines, SH-SY5Y cells (ATCC, CRL-2266; RRID:CVCL_0019) were transfected with ORF expression clone containing C terminally tagged Myc-DDK MRPL40 (Origene, RC202166) or N terminally tagged FLAG-SLC25A1 (GeneCopoeia, EX-A1932-Lv1020GS) as described .
Techniques: Ligation, Western Blot, RNA Binding Assay, Mutagenesis, Activity Assay, Quantitative RT-PCR, Control, Derivative Assay, Microscopy, Labeling