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Related Concept Videos

Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Overview of Secretory Vesicles01:33

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Comparing Copy Number Variations and SNPs02:26

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Regulation of Nuclear Protein Sorting01:45

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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...
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Overview of Exosomes01:36

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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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Updated: Sep 18, 2025

Author Spotlight: Exploring the Mechanisms of MicroRNA Loading into Extracellular Vesicles in Cancer Progression
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Author Spotlight: Exploring the Mechanisms of MicroRNA Loading into Extracellular Vesicles in Cancer Progression

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Gene Copy Number Dictates Extracellular Vesicle Cargo.

Sumeet Poudel1, Zhiyong He1, Jerilyn Izac1

  • 1National Institute of Standards and Technology (NIST), Gaithersburg, MD 20817, USA.

International Journal of Molecular Sciences
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Gene copy number influences extracellular vesicle (EV) protein loading, not RNA content. Increased gene copies correlate with higher EV protein cargo until a threshold is met, impacting cancer diagnostics and therapeutics.

Keywords:
EVEV Imaging Flow Cytometry AnalysisEV RNA loadingEV biologyEV cargoEV protein loading

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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • Extracellular vesicles (EVs) are crucial for cell-cell communication, carrying diverse biomolecules.
  • The influence of genomic alterations on EV cargo remains largely unexplored.
  • Understanding EV cargo regulation is vital for diagnostics and therapeutics.

Purpose of the Study:

  • To investigate how gene copy number impacts the protein and RNA content of extracellular vesicles.
  • To determine if genetic variations affect EV cargo loading mechanisms.

Main Methods:

  • EVs were isolated from cell lines with varying gene copy numbers (reporter gene GFP and HER2).
  • Spectradyne nCS1 was used for EV counting and size distribution analysis.
  • Imaging Flow Cytometry and ddPCR were employed to quantify EV surface proteins and RNA content, respectively.

Main Results:

  • Gene copy number significantly influenced EV protein cargo, but not RNA content.
  • Increased gene copies (GFP or HER2) correlated with a higher proportion of EVs positive for protein cargo.
  • This correlation showed a saturation effect, reaching a threshold.

Conclusions:

  • Genetics, specifically gene copy number, plays a key role in regulating EV protein loading.
  • Findings suggest a gene dosage effect on EV protein composition.
  • This has significant implications for cancer biology, diagnostics, and the development of EV-based therapies.