Developmental and evolutionary adaptations of cortical radial glia
1Department of Neurobiology, Yale University School of Medicine, New Haven, CT 06510, USA.
Cerebral Cortex (New York, N.Y. : 1991)
|May 24, 2003
Summary
Transient radial glial cells provide scaffolding and generate neurons during brain development. Comparative studies reveal conserved and species-specific differences in their function and evolution across mammals.
Area of Science:
- Neuroscience
- Developmental Biology
- Evolutionary Biology
Background:
- Radial glial cells (RGCs) were initially identified in the human fetal brain using Golgi staining.
- Their role has expanded beyond scaffolding to include neuronal lineage generation.
Purpose of the Study:
- To compare the emergence, function, and transformation of RGCs in mouse, macaque, and human embryonic brains.
- To understand conserved and species-specific mechanisms in cortical development and evolution.
Main Methods:
- Utilized advanced anatomical, molecular biology, and genetic methods.
- Performed comparative analysis across different mammalian species.
Main Results:
- Identified similarities and species-specific differences in RGC timing, sequence, and differentiation.
- Demonstrated RGCs' role in neuronal migration and lineage generation.
Conclusions:
- Comparative RGC analysis offers insights into cortical development and evolution.
- Understanding RGCs aids in studying the pathogenesis of cortical abnormalities.
Related Concept Videos
01:04Glial Cells
Overview
01:30Neurulation
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
01:15Neurogenesis and Regeneration of Nervous Tissue
In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
01:31Nervous Tissue: Glial Cells
Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial cells that interact...
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial cells that interact...