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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 eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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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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PARP10 (ARTD10) modulates mitochondrial function.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Poly(ADP-ribose) polymerase (PARP)10 is involved in mono-ADP-ribosylation.
  • PARP10 has been linked to metabolic processes and regulators.
  • Its influence on mitochondrial oxidative metabolism requires investigation.

Purpose of the Study:

  • To determine if PARP10 affects mitochondrial oxidative metabolism.
  • To investigate the impact of PARP10 depletion on cancer cell proliferation and oxidative stress.
  • To explore the relationship between PARP10 expression, cancer survival, and metabolic pathways.

Main Methods:

  • Utilized shRNAs to deplete PARP10 in various cancer cell lines (breast, cervical, colorectal, exocrine pancreas).
  • Assessed mitochondrial oxidative capacity, superoxide production, and antioxidant gene expression.
  • Analyzed AMPK activation, cell proliferation rates, and expression of anti-Warburg enzymes.
  • Correlated PARP10 expression with patient survival data from an online database and fasting conditions.

Main Results:

  • PARP10 depletion significantly increased mitochondrial oxidative capacity across multiple cancer types.
  • Silencing PARP10 reduced mitochondrial superoxide production and oxidative stress, accompanied by increased antioxidant gene expression.
  • PARP10 knockdown led to decreased proliferation in MCF7 and CaCo2 cells, associated with upregulation of anti-Warburg enzymes (Foxo1, PGC-1α, IDH2, fumarase).
  • Lower PARP10 expression correlated with increased AMPK activation, enhanced fatty acid oxidation, and improved survival in gastric cancer patients.
  • PARP10 expression decreased during fasting, a state of increased mitochondrial biogenesis.

Conclusions:

  • PARP10 plays a crucial role in regulating mitochondrial oxidative metabolism in cancer.
  • Depletion of PARP10 enhances mitochondrial function, reduces oxidative stress, and inhibits cancer cell proliferation.
  • Lower PARP10 expression is linked to favorable clinical outcomes in gastric cancer and increased fatty acid oxidation.