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Early Unguided Human Brain Organoid Neurovascular Niche Modeling into the Permissive Chick Embryo Chorioallantoic Membrane

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Separating early sensory neuron and blood vessel patterning.

Laura C Miller¹, Sabine Freter, Feng Liu

¹Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, United Kingdom.

Developmental Dynamics : an Official Publication of the American Association of Anatomists

|November 10, 2010

Summary

Developing blood vessels and sensory neurons (DRG) are anatomically linked. However, this study shows that blood vessels do not influence DRG positioning during embryonic development, revealing separable patterning mechanisms.

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Area of Science:

Developmental biology
Neuroscience
Vascular biology

Background:

The anatomical relationship between sensory nerves and blood vessels is established in adults.
Interactions between nerves and vasculature are crucial during embryonic development.
The precise relationship between developing blood vessels and sensory neuronal cell bodies remains less understood.

Purpose of the Study:

To investigate the relationship between developing blood vessels and sensory neuronal cell bodies.
To determine if blood vessels play a role in the positioning of dorsal root ganglia (DRG).

Main Methods:

Observation of chick embryos to map the anatomical positions of nascent DRG and blood vessels.
Utilizing the zebrafish cloche mutation to study DRG formation in the absence of blood vessels.

Main Results:

In chick embryos, nascent dorsal root ganglia (DRG) are located dorsal to the longitudinal anastomosis, adjacent to the developing neural tube.
Blood vessels appear in development before neurons, suggesting a potential role in DRG positioning.
In zebrafish cloche mutants lacking blood vessels, DRG formation and positioning are unaffected.

Conclusions:

The patterning of blood vessels and DRG alongside the neural tube is separable.
Blood vessels are not essential for the normal positioning of DRG during embryonic development.
The close anatomical association does not imply interdependence in early patterning events.