Pathology-related mutation A7526G (A9G) helps in the understanding of the 3D structural core of human mitochondrial

Related Experiment Video

Updated: Jun 22, 2026

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
07:24

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

Marie Messmer, Agnès Gaudry, Marie Sissler

    RNA (New York, N.Y.)
    |June 19, 2009
    PubMed

    Insights

    A mutation in mitochondrial tRNA (mt-tRNA) disrupts a key 3D structure, impacting protein synthesis and potentially causing disease. This finding sheds light on neurodegenerative disorders linked to mt-tRNA mutations.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Over 130 mutations in human mitochondrial transfer RNA (mt-tRNA) genes are linked to neurodegenerative and neuromuscular disorders.
    • The molecular mechanisms of these mutations are diverse, affecting mt-tRNA biogenesis, structure, and function in mitochondrial translation.
    • Understanding the three-dimensional (3D) structures of mammalian mt-tRNAs is crucial but remains limited.

    Discussion:

    • This study investigates the A7526G mutation in human mt-tRNA(Asp), associated with myopathy.
    • It explores the mutation's impact on 3D tertiary interactions and its role in pathology.
    • The research focuses on the significance of nucleotide 9 in mt-tRNA structure and function.

    Key Insights:

    • Experimental evidence confirms a conserved 9-12-23 triple interaction in human mt-tRNA(Asp) across mammals.
    • The A7526G mutation disrupts this critical triple interaction.
    • Disruption of the triple interaction leads to reduced aspartylation efficiency of mt-tRNA(Asp).

    Outlook:

    • Further research into 3D mt-tRNA structures can elucidate mechanisms of mitochondrial diseases.
    • Understanding these interactions may reveal therapeutic targets for neurodegenerative and neuromuscular disorders.
    • This work provides a foundation for investigating other mt-tRNA mutations and their structural consequences.

    More Related Videos

    Transmitochondrial Cybrid Generation Using Cancer Cell Lines07:49

    Transmitochondrial Cybrid Generation Using Cancer Cell Lines

    Published on: March 17, 2023

    Related Concept Videos

    Mutations01:35

    Mutations

    Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
    Chromosomal Alterations Are Large-Scale Mutations
    While point mutations are changes in a single nucleotide in...
    Mutations01:39

    Mutations

    Overview
    Mutations01:39

    Mutations

    Overview
    Translation01:31

    Translation

    Lesson: Translation
    Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
    Translation Produces the Building Blocks of Life
    Translation01:31

    Translation

    Lesson: Translation
    Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
    Translation Produces the Building Blocks of Life
    ATP Synthase: Mechanism01:48

    ATP Synthase: Mechanism

    In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...