The Journal of Neuroscience, May 15, 2002, 22(10):4002-4014
Evidence of Common Progenitors and Patterns of Dispersion in Rat
Striatum and Cerebral Cortex
Christopher B.
Reid1, 2 and
Christopher A.
Walsh3, 4, 5
1 Department of Pharmacology and
2 Neuroscience Program, F. Edward Hebert School of
Medicine, Uniformed Services University, Bethesda, Maryland 20814, 3 Division of Neurogenetics, Department of Neurology, Beth
Israel Deaconess Medical Center, Harvard Institutes of Medicine,
Boston, Massachusetts 02115, and 4 Program in Neuroscience
and 5 Program in Biological and Biomedical Sciences,
Harvard Medical School, Boston, Massachusetts 02115
To correlate clonal patterns in the rat striatum with adult
neuronal phenotypes, we labeled striatal progenitors between embryonic day 14 (E14) and E19 with a retroviral library encoding alkaline phosphatase. In the adult striatum, the majority of E14-labeled neurons (87%) were members of discrete horizontal or radial cell clusters. Radial clusters accounted for only 23% of cell clusters but
>34% of labeled cells. Striatal clones also demonstrated an unexpected widespread pattern of clonal dispersion. The majority of
striatal clones were widely dispersed within the striatum, and 80% of
clones were part of even larger clones that included cortical
interneurons. Finally, we observed that PCR-positive cortical
interneurons were members of clones containing both interneurons and
pyramids (44%), exclusively interneuron clones (24%), or combined striatal-cortical clones (16%), consistent with the view that cortical interneurons have multiple origins in differentially behaving
progenitor cells. Our data are also consistent with the notion that
similar mechanisms underpin striatal and cortical development.
Key words:
cortex; striatum; radial migration; tangential migration; clonal analysis; pyramidal neuron; nonpyramidal neuron; interneurons; radial glia
Copyright © 2002 Society for Neuroscience 0270-6474/02/22104002-13$05.00/0