Cited by 31Mitochondrial Function and PathologyRNA and protein synthesis mechanismsRNA modifications and cancer

A new mechanism for mtDNA pathogenesis: impairment of post-transcriptional maturation leads to severe depletion of mitochondrial tRNASer(UCN) caused by T7512C and G7497A point mutations

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Mollers, M.·2005·Nucleic Acids Research

Abstract

We have studied the consequences of two homoplasmic, pathogenic point mutations (T7512C and G7497A) in the tRNA(Ser(UCN)) gene of mitochondrial (mt) DNA using osteosarcoma cybrids. We identified a severe reduction of tRNA(Ser(UCN)) to levels below 10% of controls for both mutations, resulting in a 40% reduction in mitochondrial protein synthesis rate and in a respiratory chain deficiency resembling that in the patients muscle. Aminoacylation was apparently unaffected. On non-denaturating northern blots we detected an altered electrophoretic mobility for G7497A containing tRNA molecules suggesting a structural impact of this mutation, which was confirmed by structural probing. By comparing in vitro transcribed molecules with native RNA in such gels, we also identified tRNA(Ser(UCN)) being present in two isoforms in vivo, probably corresponding to the nascent, unmodified transcripts co-migrating with the in vitro transcripts and a second, faster moving isoform corresponding to the mature tRNA. In cybrids containing either mutations the unmodified isoforms were severely reduced. We hypothesize that both mutations lead to an impairment of post-transcriptional modification processes, ultimately leading to a preponderance of degradation by nucleases over maturation by modifying enzymes, resulting in severely reduced tRNA(Ser(UCN)) steady state levels. We infer that an increased degradation rate, caused by disturbance of tRNA maturation and, in the case of the G7497A mutant, alteration of tRNA structure, is a new pathogenic mechanism of mt tRNA point mutations.

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  • m.7512T N C causes slight localised kinking of the acceptor stem.

    “The mt-tRNA Ser(UCN) m.7512T N C mutation causes slight localised kinking of the acceptor stem [199]”

    From Mitochondrial DNA mutations and human disease (2010) · cites this paper as [199]

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Authors
Mollers, M.
Venue
Nucleic Acids Research
Published
2005-09-25
Volume
33
Issue
17
Pages
5647-5658
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2120270701
Cited by
31
References
52
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 2 · 2013: 1
FWCI
1.00
Type
journal article
Language
en
Open access
Licence
other-oa
Locations
  • Nucleic Acids Research (publishedVersion, other-oa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DORA Empa (Swiss Federal Laboratories for Materials Science and Technology (Empa)) (submittedVersion, other-oa)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
Keywords
mitochondrial tRNA, mitochondrial DNA point mutations, tRNA degradation, mitochondrial translation, respiratory chain deficiency, tRNA structure
MeSH terms
RNA, Mitochondrial, Base Sequence, Cell Line, Child, Child, Preschool, Electron Transport Complex IV, DNA, Mitochondrial, Humans, Male, Molecular Sequence Data, RNA, RNA Precursors, RNA Processing, Post-Transcriptional, RNA, Transfer, Ser, Point Mutation, RNA Stability, Mitochondrial Proteins, Mitochondrial Diseases, Electron Transport Complex I, Aminoacylation

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