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A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains

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Differential changes in the cellular composition of the developing marsupial brain.

Adele M H Seelke¹, James C Dooley, Leah A Krubitzer

¹Center for Neuroscience, University of California, Davis, Davis, California 95618, USA.

The Journal of Comparative Neurology

|January 17, 2013

Summary

Marsupial brain development shows dynamic neuron and nonneuron cell changes. Nonneurons may be crucial for signal processing in opossum brains, unlike in other mammals.

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Area of Science:

Neuroscience
Developmental Biology
Comparative Anatomy

Background:

Brain development involves significant changes in cell number and type.
Neurons and glia (nonneurons) follow distinct developmental trajectories.

Purpose of the Study:

To investigate cellular composition changes during marsupial brain development.
To compare brain organization in the short-tailed opossum (Monodelphis domestica) with other mammals.

Main Methods:

Utilized the isotropic fractionator method.
Analyzed cellular composition at multiple developmental stages.

Main Results:

Neocortex neurons are most abundant during later neurogenesis (P18) but stable throughout life.
Subcortical neuron numbers decrease post-P18, with a rise in nonneurons.
Cerebellar cell numbers peak at P180; neuron numbers remain constant.
Neuronal density and percentage decrease after neurogenesis in major brain structures.
Opossum brains have fewer neurons and more nonneurons than similar-sized mammal brains.

Conclusions:

Marsupial brain development exhibits unique patterns of neuronal and nonneuronal cell dynamics.
The high proportion of nonneurons suggests a significant role in marsupial brain signal processing.
Findings offer insights into the evolutionary divergence of brain organization.