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Related Experiment Video

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Quantifying the genetic influence on mammalian vascular tree structure.

Robb Glenny1, Susan Bernard, Blazej Neradilek

  • 1Division of Pulmonary and Critical Care Medicine, School of Medicine, Box 356522, University of Washington, Seattle, WA 98195, USA. glenny@u.washington.edu

Proceedings of the National Academy of Sciences of the United States of America
|April 11, 2007
PubMed
Summary

Vascular tree geometry is heritable, with 67% of organ blood flow variability controlled by genetics. This suggests evolutionary selection for efficient nutrient distribution in animals and plants.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Physiology

Background:

  • Fractal vascular trees are common in nature, suggesting evolutionary advantages for nutrient distribution.
  • The heritability of vascular tree geometry, crucial for this theory, remains largely untested.

Purpose of the Study:

  • To investigate the balance of genetic and non-genetic factors in shaping vascular trees.
  • To determine the heritability of vascular tree geometry and its role in nutrient distribution.

Main Methods:

  • Studied spatial distribution of organ blood flow in armadillos, utilizing genetically identical littermates.
  • Employed fractal analysis to characterize vascular tree patterns.
  • Utilized an ANOVA model to estimate genetic control of blood flow variability.

Main Results:

  • Regional blood flow distribution showed strong correlation in littermates (r²=0.56) vs. unrelated animals (r²=0.36).
  • An ANOVA model estimated 67% of regional organ blood flow variability is genetically controlled.
  • Fractal analysis revealed shared vascular patterns in lungs and hearts of related animals.

Conclusions:

  • Vascular tree geometries are heritable and subject to evolutionary selection.
  • Post-genetic modifications allow vascular trees to adapt to local factors, providing system flexibility.