The Interface of Mitochondrial Genetics, Epigenetics and Energetics in Muscle Metabolism

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Cell Metabolism".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 1796

Special Issue Editor


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Guest Editor
Institute of General Medicine and Family Health, Martin-Universität Halle-Wittenberg, 06099 Halle, Germany
Interests: metabolic myopathies; mitochondrial disorders; human genetics; clinical implication of diseases; neuromuscular disorders from a general medicine perspective
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Special Issue Information

Dear Colleagues,

All cells, including muscle cells, consume energy to perform work. This energy is generated by metabolism of adenosine triphosphate (ATP) to adenosine diphosphate (ADP) and is funneled through bioenergetic systems such as glycolysis and mitochondrial oxidative phosphorylation (OXPHOS). The OXPHOS system is embedded inside the inner mitochondrial membrane, and  it consists of five multiprotein complexes and two electron carriers. The individual subunits of the OXPHOS complexes are encoded either by mitochondrial DNA (mtDNA) or nuclear DNA (nDNA). Apart from that, a number of various bioenergetic genes are spread across chrosome and mtDNA. Hence, the epigenetic and genetic abnormalities within the mitochondria as well as within the chromosome tend to lead to abnormal mitochondrial bioenergetics, subsequently affecting the muscle metabolism. This is strengthened by the fact that an influence of epigenetic and genetic mechanisms on the normal functioning of various cellular activities, including mitochondrial bioenergetics, has been frequently reported. The growing interest of researchers in the interface of mtDNA epigenetic and genetic modifications and bioenergetics over the years has opened a broad new avenue into the interaction mechanisms between mitochondria and nucleus. Hence, the present Special Issue will focus on the reciprocal control of mitochondrial and nuclear epigenetic, genetic, and bioenergetic factors, focusing on the role of mitochondrial genome and metabolism in shaping epigenetic modulation of gene expression and subsequent muscle metabolism dysfunction.

In this Special Issue entitled “The interface of Mitochondrial Genetics, Epigenetics, and Energetics in Muscle Metabolism”, submissions of original scientific reports, review articles, case reports, and perspective pieces on the role of mitochondrial modification on muscle metabolism are invited. Hence, this issue will cover the diverse genetic, epigenetic, as well as bioenergetic aspects of mitochondrial myopathies leading to abnormal muscle metabolism.

There is no doubt that this Special Issue will be an incredible resource for scientists working within the field of mitochondrial myopathies as well as for life science researchers in general.

Dr. Pushpa Raj Joshi
Guest Editor

Manuscript Submission Information

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Keywords

  • cell metabolism mtDNA mutation
  • large-scale deletions
  • metabolism
  • oxidative stress
  • oxidative phosphorylation
  • metabolic disorders
  • multi-systemic disorders
  • isolated myopathy
  • neurological disorders
  • mitochondria-targeting therapy

Published Papers (1 paper)

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Research

7 pages, 512 KiB  
Article
Normal Thermostability of p.Ser113Leu and p.Arg631Cys Variants of Mitochondrial Carnitine Palmitoyltransferase II (CPT II) in Human Muscle Homogenate
by Pushpa Raj Joshi, Maria Gräfin zu Stolberg-Stolberg, Leila Motlagh Scholle, Beate Meinhardt, Elena Pegoraro and Stephan Zierz
Metabolites 2022, 12(11), 1141; https://doi.org/10.3390/metabo12111141 - 19 Nov 2022
Cited by 1 | Viewed by 1098
Abstract
Previous fibroblast and recombinant enzyme studies showed a markedly thermolabile p.Ser113Leu variant compared to the wild-type (WT) in muscle carnitine palmitoyltransferase II (CPT II) deficiency. Additionally, it has been shown that cardiolipin (CLP) stimulated or inhibited the p.Ser113Leu recombinant variant depending on the [...] Read more.
Previous fibroblast and recombinant enzyme studies showed a markedly thermolabile p.Ser113Leu variant compared to the wild-type (WT) in muscle carnitine palmitoyltransferase II (CPT II) deficiency. Additionally, it has been shown that cardiolipin (CLP) stimulated or inhibited the p.Ser113Leu recombinant variant depending on the pre-incubation temperatures. In this study, the thermolabilities of mitochondrial enzyme CPT II in muscle homogenates of patients with the p.Ser113Leu (n = 3) and p.Arg631Cys (n = 2) variants were identified to be similar to that of WT. Pre-incubation with CLP on ice stimulated the WT enzyme more than both variants. However, CLP stimulated the variants and WT at 46 °C to about 6–18-fold. The present data indicate that the thermostability of CPT II variant in muscle homogenate is similar to that of WT. This is in contrast to the increased thermolability of enzymes derived from fibroblast and that of recombinant enzymes. Hence, it can be speculated that the disruption of the compartmentation in muscle homogenate mediates a protective effect on the thermolability of the native variant. However, the exact mechanism remains unclear. However, the activating effect of CLP on CPT II in muscle homogenate seems to align with those on recombinant enzymes. Full article
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