RT Journal Article
SR Electronic
T1 The Germinal Zones of the Basal Ganglia But Not the Septum Generate GABAergic Interneurons for the Cortex
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP 12050
OP 12062
DO 10.1523/JNEUROSCI.6178-09.2010
VO 30
IS 36
A1 Anna N. Rubin
A1 Fabienne Alfonsi
A1 Michael P. Humphreys
A1 Christina K. P. Choi
A1 Susana F. Rocha
A1 Nicoletta Kessaris
YR 2010
UL http://www.jneurosci.org/content/30/36/12050.abstract
AB Cortical interneurons originate from subpallial precursors and migrate into the cortex during development. Using genetic lineage tracing in transgenic mice we examine the contribution of two germinal zones, the septum and the lateral ganglionic eminence/caudal ganglionic eminence (LGE/CGE) to interneurons of the cortex. We find that the septal neuroepithelium does not generate interneurons for the neocortex. There is, however, clear migration of cells from the LGE/CGE to the cortex. Comparison of the dynamics of cortical colonization by the two major cohorts of interneurons originating in the medial ganglionic eminence (MGE) and the LGE/CGE has shown differences in the timing of migration and initial route of entry into the cortex. LGE/CGE-derived interneurons enter the cortex later than the MGE-derived ones. They invade the cortex through the subventricular/intermediate zone route and only later disperse within the cortical plate and the marginal zone. During the first postnatal week MGE interneurons move extensively to acquire their laminar position within the cortical plate whereas LGE/CGE-derived cells remain largely within the upper layers of the cortex. The two populations intermingle in the adult cortex but have distinct neurochemical properties and different overall distributions. LGE/CGE-derived interneurons account for one third of the total GABAergic interneuron population in the adult cortex.