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Related Concept Videos

Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

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Using the E1A Minigene Tool to Study mRNA Splicing Changes
10:25

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Published on: April 22, 2021

Phosphorylation-controlled nuclear speckle dynamics regulate splicing.

Suchismita Masanta1, Kevork Wakimian1, Maciej Cieśla1

  • 1IMol Polish Academy of Sciences, Warsaw, Poland.

Trends in Biochemical Sciences
|June 6, 2026
PubMed
Summary

Nuclear speckles, dynamic structures within the cell nucleus, regulate gene expression by controlling RNA splicing. Phosphorylation of splicing factors drives their remodeling, linking nuclear organization to RNA processing outcomes.

Keywords:
intrinsically disordered regionsnuclear specklesphosphorylationspliceosomesplicing factors

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Gene Expression Regulation

Background:

  • Splicing is crucial for generating RNA diversity and controlling gene expression.
  • Nuclear speckles are dynamic nuclear bodies that concentrate splicing machinery.
  • The physical state and organization of nuclear speckles influence splicing outcomes.

Purpose of the Study:

  • To synthesize recent advances in understanding how nuclear architecture and speckle dynamics regulate splicing.
  • To propose a unified model for how phosphorylation-dependent condensate remodeling links nuclear organization to splicing.
  • To highlight the spatial and temporal regulation of spliceosome function.

Main Methods:

  • Review of emerging evidence on nuclear architecture, nuclear speckles, and splicing regulation.
  • Integration of findings on chromatin organization, transcript architecture, and condensate properties.
  • Synthesis of data on cell cycle and ultradian dynamics of speckle assembly.

Main Results:

  • Splicing is governed by a multilayered framework involving nuclear architecture and nuclear speckles.
  • Nuclear speckles act as phosphorylation-sensitive hubs coupling signaling to RNA processing.
  • Chromatin, transcript, and condensate properties are coordinated, imposing spatial constraints on splicing.
  • Cell cycle and ultradian dynamics contribute to temporal regulation of splicing via speckle assembly.

Conclusions:

  • A unified model proposes that charge-dependent phosphorylation of splicing factors drives nuclear speckle remodeling.
  • This remodeling process links nuclear organization to regulated splicing outcomes across space and time.
  • Understanding these dynamics is key to deciphering gene expression control and RNA diversity.