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DDX1 vesicles control calcium-dependent mitochondrial activity in mouse embryos.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Genetics

Background:

  • The DEAD box protein DDX1 is known for roles in RNA processing and DNA repair.
  • DDX1 aggregates in the cytoplasm of early mouse embryos, and its absence causes developmental arrest.
  • The precise function of DDX1 in early embryogenesis remains unclear.

Purpose of the Study:

  • To elucidate the function of DDX1 in early mouse embryonic development.
  • To characterize the novel DDX1-containing structures observed in early embryos.
  • To investigate the role of these structures in calcium regulation and mitochondrial function.

Main Methods:

  • Identification and characterization of DDX1-containing organelles using microscopy.
  • Analysis of Ddx1 knockout mouse embryos to assess developmental phenotypes.
  • Assessment of calcium distribution, mitochondrial membrane potential, and reactive oxygen species levels.
  • RNA sequencing analysis of embryos with varying Ddx1 expression levels.

Main Results:

  • A novel organelle, the Membrane Associated RNA-containing Vesicle (MARV), containing DDX1 and nucleic acids, was identified.
  • DDX1 is essential for MARV formation, which exhibit ring-like structures in early embryos.
  • Ddx1 knockout disrupts embryonic calcium distribution, increases mitochondrial activity and ROS, and leads to developmental arrest.
  • Downregulation of developmental and mitochondrial RNAs correlates with low Ddx1 RNA levels.

Conclusions:

  • DDX1 is crucial for the formation of MARVs, which regulate spatial calcium distribution in early embryos.
  • MARVs play a vital role in calcium-controlled mitochondrial functions essential for embryonic development.
  • Dysregulation of MARVs and calcium homeostasis contributes to developmental defects observed in Ddx1 knockout embryos.