6533b870fe1ef96bd12cfcfc
RESEARCH PRODUCT
A spontaneous mitonuclear epistasis converging on Rieske Fe-S protein exacerbates complex III deficiency in mice
Noora AhoNoora AhoMårten WikströmVladislav GrigorjevVineta FellmanVivek SharmaJanne PurhonenArtur OsyczkaRobert EkiertJukka KallijärviRafał PietrasKatarina TruvéJayasimman Rajendransubject
DYNAMICSepistasisMale0301 basic medicineNon-Mendelian inheritanceMitochondrial DiseasesMetabolic disordersRespiratory chainGeneral Physics and AstronomyDISEASEmitokondriotauditElectron Transport Complex IIIMice0302 clinical medicineenergy metabolismCRYSTAL-STRUCTUREIRON-SULFUR PROTEINlcsh:ScienceMice KnockoutGeneticsmitokondrio-DNAMultidisciplinaryCYTOCHROME BC(1) COMPLEXCytochrome bQCytochromes bMitochondria3. Good healthFemaleRESPIRATORY-CHAINGRACILE SYNDROMEhenkiinjääminenOxidation-ReductionMitochondrial DNAMitochondrial diseaseScienceCongenicMolecular Dynamics SimulationBiologyDNA MitochondrialArticleGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesaineenvaihduntahäiriötmedicinemetabolic disordersAnimalsMUTATIONSEpistasis GeneticEnergy metabolismGeneral ChemistryCytochrome b Groupmedicine.diseaseMice Inbred C57BL030104 developmental biologyCoenzyme Q – cytochrome c reductaseEpistasis1182 Biochemistry cell and molecular biologyATPases Associated with Diverse Cellular ActivitiesEpistasislcsh:QGUI MEMBRANE-BUILDERkoe-eläinmallitMetabolism Inborn Errors030217 neurology & neurosurgeryGENERATIONMolecular Chaperonesdescription
We previously observed an unexpected fivefold (35 vs. 200 days) difference in the survival of respiratory chain complex III (CIII) deficient Bcs1lp.S78G mice between two congenic backgrounds. Here, we identify a spontaneous homoplasmic mtDNA variant (m.G14904A, mt-Cybp.D254N), affecting the CIII subunit cytochrome b (MT-CYB), in the background with short survival. We utilize maternal inheritance of mtDNA to confirm this as the causative variant and show that it further decreases the low CIII activity in Bcs1lp.S78G tissues to below survival threshold by 35 days of age. Molecular dynamics simulations predict D254N to restrict the flexibility of MT-CYB ef loop, potentially affecting RISP dynamics. In Rhodobacter cytochrome bc1 complex the equivalent substitution causes a kinetics defect with longer occupancy of RISP head domain towards the quinol oxidation site. These findings represent a unique case of spontaneous mitonuclear epistasis and highlight the role of mtDNA variation as modifier of mitochondrial disease phenotypes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-16 | Nature Communications |