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Related Concept Videos

Coronary Circulation01:21

Coronary Circulation

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The heart, an organ critical to survival, gets nourishment not from the blood it pumps but from a separate circulation system known as coronary circulation. This is the shortest circulation in the body and is responsible for supplying the heart with the nutrients it needs to function effectively.
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Fetal Circulation01:14

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Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
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Vesicular Tubular Clusters01:45

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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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Overview of Pulmonary Circulation01:19

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The pulmonary circulation is a vital system in our body that acts as a bridge between the respiratory and cardiovascular systems. It serves as a transport network for deoxygenated blood from the heart to the lungs and then returns oxygen-rich blood back to the heart.
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Overview of Systemic and Pulmonary Circulation01:15

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The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
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Intratumor Heterogeneity and Circulating Tumor Cell Clusters.

Zafarali Ahmed1, Simon Gravel2,3

  • 1School of Computer Science, McGill University, Montréeal, QC, Canada.

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Tumor genetic diversity impacts cancer progression and treatment resistance. Simulations show cell turnover increases tumor diversity, and circulating tumor cell clusters offer insights into tumor evolution and metastasis.

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Area of Science:

  • Computational biology
  • Cancer research
  • Tumor microenvironment dynamics

Background:

  • Genetic diversity is crucial for tumor progression, metastasis, and treatment resistance.
  • Understanding tumor heterogeneity at finer scales is experimentally advancing but interpretation remains challenging.

Purpose of the Study:

  • To investigate the interplay between tumor growth dynamics, microscopic composition, and circulating tumor cell cluster diversity using numerical models.
  • To explore how variations in growth parameters influence microscopic diversity and spatial distribution of tumor clones.

Main Methods:

  • Macroscopic tumor simulations incorporating growth dynamics and microscopic composition.
  • Analysis of spatial segregation and mixing of clones under different growth and turnover parameters.
  • Power analysis of multiregion sequencing data to detect predicted spatial trends in tumor evolution.

Main Results:

  • Modest differences in growth parameters significantly alter microscopic tumor diversity.
  • Simple expansion leads to segregated clones, while cell turnover promotes clone mixing and increases core diversity.
  • Current multiregion sequencing studies have limited power to detect these predicted evolutionary effects.

Conclusions:

  • Cell turnover is a key factor driving increased microscopic tumor diversity.
  • Sequencing smaller biopsies or circulating tumor cell clusters can improve the detection of tumor evolution models.
  • Circulating tumor cell clusters, obtainable via blood draws, provide valuable information on tumor evolution and metastatic potential.