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Updated: Mar 30, 2026
Fluorescent End-Labeling and Encapsulation of Long RNAs for Single-Molecule FRET-TIRF Microscopy
Published on: October 18, 2024
Import of Fluorescent RNA into Mitochondria of Living Cells
Jaroslav Zelenka1, Petr Ježek2
1Department No. 75, Membrane Transprot Biophysics, Institute of Physiology, Academy of Sciences of the Czech Republic, Videnska 1084, Prague 4, 14220, Czech Republic.
Abstract:
Methods of in vivo visualization and manipulation of mitochondrial genetic machinery are limited due to the need to surpass not only the cytoplasmic membrane but also two mitochondrial membranes. Here, we employ the matrix-addressing sequence of mitochondrial ribosomal 5S-rRNA (termed MAM), which is naturally imported into mammalian mitochondria, to construct an import system for in vivo targeting of mitochondrial (mt) DNA or mtRNA, in order to provide fluorescence hybridization of the desired sequences.
Insights
Researchers developed a novel system for in vivo mitochondrial targeting. This method enables visualization and manipulation of mitochondrial DNA and RNA using a matrix-addressing sequence (MAM) for enhanced genetic research.
Area of Science:
- Mitochondrial biology
- Molecular genetics
- Cellular imaging
Background:
- In vivo visualization and manipulation of mitochondrial genetic material is challenging due to the multiple membrane barriers.
- Existing methods are limited in their ability to efficiently target mitochondrial DNA (mtDNA) and mitochondrial RNA (mtRNA) within living cells.
Purpose of the Study:
- To establish a novel in vivo system for targeting and visualizing mitochondrial genetic machinery.
- To overcome the limitations of current methods for accessing and manipulating mtDNA and mtRNA within mammalian mitochondria.
Main Methods:
- Utilized the matrix-addressing sequence (MAM) derived from mitochondrial ribosomal 5S-rRNA, known for natural import into mitochondria.
- Constructed an import system leveraging MAM for targeted delivery of nucleic acid probes.
- Employed fluorescence hybridization for detecting and visualizing specific mtDNA or mtRNA sequences in vivo.
Main Results:
- Successfully demonstrated the in vivo import of the MAM-based system into mammalian mitochondria.
- Enabled specific targeting and fluorescence hybridization of desired mitochondrial DNA and RNA sequences.
- Established a proof-of-concept for in vivo visualization of mitochondrial genetic components.
Conclusions:
- The developed MAM-based import system provides an effective strategy for in vivo mitochondrial targeting.
- This approach facilitates the visualization and potential manipulation of mitochondrial genetic material.
- Opens new avenues for studying mitochondrial genetics and related diseases.
