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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Preparation of Plasma Membrane Vesicles from Bone Marrow Mesenchymal Stem Cells for Potential Cytoplasm Replacement Therapy
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The Mitochondrial Replacement 'Therapy' Myth.

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    This summary is machine-generated.

    Mitochondrial replacement therapies (MRT), like maternal spindle transfer (MST) and pro-nuclear transfer (PNT), do not cure existing children but create new, healthy ones. Therefore, they are not medical therapies, despite ethical debates on identity.

    Keywords:
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    Area of Science:

    • Bioethics
    • Reproductive Technologies
    • Genetics

    Background:

    • Mitochondrial replacement therapies (MRT), including maternal spindle transfer (MST) and pro-nuclear transfer (PNT), are emerging reproductive technologies.
    • Debates exist regarding the ethical implications and classification of these techniques, particularly concerning the Non-Identity Problem.

    Purpose of the Study:

    • To critically evaluate the classification of MST and PNT as medical therapies.
    • To analyze the ethical arguments concerning the Non-Identity Problem in relation to MST and PNT.
    • To caution against the rhetoric surrounding MRTs in bioethical discourse.

    Main Methods:

    • Philosophical analysis of ethical arguments presented in bioethics literature.
    • Conceptual analysis of the terms "therapy" and "cure" in the context of reproductive technologies.
    • Critique of the application of the Non-Identity Problem to mitochondrial replacement.

    Main Results:

    • MST and PNT are not medical therapies because they create new individuals rather than treating existing ones.
    • Both MST and PNT are identity-affecting techniques, challenging claims that PNT is morally preferable due to the Non-Identity Problem.
    • The application of the Non-Identity Problem to MRTs may lead to unwarranted moral conclusions.

    Conclusions:

    • MRT should not be misconstrued as a cure or therapy for mitochondrial diseases.
    • Caution is advised against using "life-saving" rhetoric when discussing MRTs in bioethics.
    • Ethical considerations of MRTs require careful distinction between creating healthy lives and medical treatment.