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Related Concept Videos

RNA Splicing01:32

RNA Splicing

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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...
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Alternative RNA Splicing02:18

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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.
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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Chromatin Structure Regulates pre-mRNA Processing02:41

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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.
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Updated: Sep 23, 2025

Identification of Alternative Splicing and Polyadenylation in RNA-seq Data
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Analysis of CCR2 splice variant expression patterns and functional properties.

Hee-Kyung Park1, Yun Hee Na1, Huong Thi Nguyen1

  • 1Department of Biomedical Sciences, College of Medicine, Korea University, 73 Goryeodae-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.

Cell & Bioscience
|May 13, 2022
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Summary

The C-C motif chemokine receptor 2 (CCR2) isoform, CCR2A, is expressed in solid cancer cells and enhances monocyte chemoattractant protein-1 (MCP-1) responses. Unlike CCR2B, CCR2A resists internalization, suggesting a key role in cancer progression.

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CCR2ChemotaxisMCP-1Splice variantβ-Arrestin

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • C-C motif chemokine receptor 2 (CCR2) is crucial for immune cell migration in inflammatory diseases.
  • The CCR2 gene produces two isoforms, CCR2A and CCR2B, with distinct C-terminal intracellular loops due to alternative splicing.
  • Previous research primarily focused on CCR2B, with limited understanding of CCR2A's functional roles.

Purpose of the Study:

  • To investigate the differential expression and functional properties of CCR2A and CCR2B.
  • To elucidate the role of CCR2A in cellular responses, particularly in the context of cancer.

Main Methods:

  • Analysis of CCR2 gene expression across various cell types.
  • Utilizing the HiBiT assay to assess cell surface localization.
  • Investigating receptor internalization mechanisms involving G protein-coupled receptor kinases (GRKs) and β-arrestin.
  • Comparing cellular responses mediated by CCR2A and CCR2B upon MCP-1 stimulation.
  • Assessing the impact of CCR2A deficiency on HeLa cell growth and motility.

Main Results:

  • CCR2A was predominantly expressed in adherent cells, while CCR2B was dominant in monocytic cells.
  • CCR2A's C-terminal region showed limited basic amino acids, potentially hindering cell surface localization.
  • CCR2A exhibited resistance to internalization and enhanced MCP-1-stimulated responses compared to CCR2B.
  • HeLa cells lacking CCR2A displayed reduced growth and impaired chemotactic activity towards MCP-1.
  • Both CCR2A and CCR2B mediated signaling through Gαq and Gαi.

Conclusions:

  • CCR2A, but not CCR2B, is expressed in solid cancer-derived cells.
  • CCR2A's resistance to β-arrestin-mediated internalization enhances MCP-1 responses.
  • CCR2A plays essential roles in solid cancer progression by potentially recruiting macrophages.