PUBLICATION
Ablation of Mto1 in zebrafish exhibited hypertrophic cardiomyopathy manifested by mitochondrion RNA maturation deficiency
- Authors
- Zhang, Q., He, X., Yao, S., Lin, T., Zhang, L., Chen, D., Chen, C., Yang, Q., Li, F., Zhu, Y.M., Guan, M.X.
- ID
- ZDB-PUB-210410-11
- Date
- 2021
- Source
- Nucleic acids research 49(8): 4689-4704 (Journal)
- Registered Authors
- Keywords
- none
- MeSH Terms
-
- Animals
- Animals, Genetically Modified
- Cardiomyopathy, Hypertrophic/genetics*
- Cardiomyopathy, Hypertrophic/physiopathology
- Gene Expression Profiling
- Heart/embryology*
- Heart/physiopathology
- In Situ Hybridization
- Microscopy, Electron, Transmission
- Mitochondria/enzymology
- Mitochondria/genetics
- Mitochondria/metabolism*
- Mitochondria/pathology
- Mitochondrial Proteins/genetics
- Mitochondrial Proteins/metabolism*
- Mutation
- Myocardium/metabolism
- Myocardium/pathology
- Myocytes, Cardiac/metabolism
- Myocytes, Cardiac/pathology
- Oxidative Phosphorylation
- Polyadenylation/genetics
- RNA, Mitochondrial/metabolism*
- RNA, Transfer/genetics
- RNA, Transfer/metabolism
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism*
- Transfer RNA Aminoacylation/genetics
- Zebrafish/embryology
- Zebrafish/genetics
- Zebrafish/metabolism*
- PubMed
- 33836087 Full text @ Nucleic Acids Res.
Citation
Zhang, Q., He, X., Yao, S., Lin, T., Zhang, L., Chen, D., Chen, C., Yang, Q., Li, F., Zhu, Y.M., Guan, M.X. (2021) Ablation of Mto1 in zebrafish exhibited hypertrophic cardiomyopathy manifested by mitochondrion RNA maturation deficiency. Nucleic acids research. 49(8):4689-4704.
Abstract
Deficient maturations of mitochondrial transcripts are linked to clinical abnormalities but their pathophysiology remains elusive. Previous investigations showed that pathogenic variants in MTO1 for the biosynthesis of τm5U of tRNAGlu, tRNAGln, tRNALys, tRNATrp and tRNALeu(UUR) were associated with hypertrophic cardiomyopathy (HCM). Using mto1 knock-out(KO) zebrafish generated by CRISPR/Cas9 system, we demonstrated the pleiotropic effects of Mto1 deficiency on mitochondrial RNA maturations. The perturbed structure and stability of tRNAs caused by mto1 deletion were evidenced by conformation changes and sensitivity to S1-mediated digestion of tRNAGln, tRNALys, tRNATrp and tRNALeu(UUR). Notably, mto1KO zebrafish exhibited the global decreases in the aminoacylation of mitochondrial tRNAs with the taurine modification. Strikingly, ablated mto1 mediated the expression of MTPAP and caused the altered polyadenylation of cox1, cox3, and nd1 mRNAs. Immunoprecipitation assay indicated the interaction of MTO1 with MTPAP related to mRNA polyadenylation. These alterations impaired mitochondrial translation and reduced activities of oxidative phosphorylation complexes. These mitochondria dysfunctions caused heart development defects and hypertrophy of cardiomyocytes and myocardial fiber disarray in ventricles. These cardiac defects in the mto1KO zebrafish recapitulated the clinical phenotypes in HCM patients carrying the MTO1 mutation(s). Our findings highlighted the critical role of MTO1 in mitochondrial transcript maturation and their pathological consequences in hypertrophic cardiomyopathy.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping