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Organization and function of paraspeckles.

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Paraspeckles, nuclear bodies built on NEAT1 RNA, are crucial for cellular processes. Recent studies reveal their detailed structure and function, highlighting NEAT1

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Paraspeckles are subnuclear bodies assembled on the long noncoding RNA NEAT1.
  • They play roles in cellular stress responses, differentiation, and cancer progression.

Purpose of the Study:

  • To review recent advancements in understanding paraspeckle structure and function.
  • To explore the mechanisms by which paraspeckles regulate gene expression.

Main Methods:

  • Ultra-resolution microscopy with multicolor labeling of NEAT1 RNA and paraspeckle proteins.
  • Functional dissection of NEAT1 to identify critical subdomains.

Main Results:

  • Paraspeckles exhibit a core-shell spheroidal structure with NEAT1 transcripts and proteins organized in distinct layers.
  • Specific NEAT1 subdomains are essential for RNA stability, isoform switching, and paraspeckle assembly via liquid-liquid phase separation (LLPS).

Conclusions:

  • Paraspeckles are dynamic structures with a precise organization crucial for their function.
  • Paraspeckles spatiotemporally control gene regulation by sequestering proteins and RNAs.