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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
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Two neuronal peptides encoded from a single transcript regulate mitochondrial complex III in Drosophila.

Justin A Bosch1, Berrak Ugur2, Israel Pichardo-Casas1

  • 1Department of Genetics, Blavatnick Institute, Harvard Medical School, Boston, United States.

Elife
|November 8, 2022
PubMed
Summary

Two newly discovered peptides, Sloth1 and Sloth2, encoded by small open-reading frames (smORFs) in Drosophila, are crucial for neuronal and mitochondrial function, with their loss leading to lethality and neurodegeneration.

Keywords:
CRISPR/Cas9D. melanogastergeneticsgenomicsmitochondrianeurodegenerationneuroscienceparalogspeptidesmORF

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Naturally produced peptides (<100 amino acids) regulate key physiological processes.
  • Thousands of peptides may originate from small open-reading frames (smORFs).
  • The biological functions of smORF-encoded peptides remain largely uncharacterized.

Purpose of the Study:

  • To characterize two novel peptides, Sloth1 and Sloth2, encoded by conserved smORFs in Drosophila.
  • To investigate the function and biological roles of Sloth1 and Sloth2.
  • To explore the significance of smORF-derived peptides in biological systems.

Main Methods:

  • Identification and characterization of peptides encoded by conserved smORFs in Drosophila.
  • Analysis of Sloth1 and Sloth2 expression patterns and localization.
  • Functional studies involving loss-of-function mutations to assess phenotypic consequences.
  • Investigation of mitochondrial function and complex III assembly.

Main Results:

  • Two peptides, Sloth1 and Sloth2, are translated from the same bicistronic transcript and are highly expressed in neurons.
  • Loss of Sloth1 or Sloth2 results in animal lethality, impaired neuronal and mitochondrial function, and neurodegeneration.
  • Sloth1/2 peptides are imported into mitochondria and regulate mitochondrial complex III assembly.

Conclusions:

  • Sloth1 and Sloth2, encoded by smORFs, are essential for Drosophila viability and function.
  • These peptides play critical roles in neuronal health and mitochondrial complex III assembly.
  • Phenotypic analysis of smORF genes in Drosophila offers valuable insights into the functions of this gene class.