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The transcription factor Dlx2 is expressed widely throughout the ventral telencephalon. We have examined the in vitro and in vivo migration of Dlx2 progenitors originating from the different ganglionic eminences of both wild type and Nkx2.1 mutant animals. By examining the expression of tauLacZ targeted into the Dlx2 locus we were able to visualize the distribution of cells expressing this gene at both embryonic and postnatal stages. This analysis suggested that Dlx2-expressing cells traverse a number of characteristic migratory routes to populate both cortical and subcortical regions. We also examined how these patterns of migration were affected in Nkx2.1 mutant animals. In these mutants, the early but not late populations of Dlx2-expressing cells originating in the ventral telencephalon that migrate to the cortex are lost. This recovery may be, at least in part, a result of the late migration of Dlx2 progenitors from the caudal ganglionic eminences (CGE), which, based on our previous work, does not appear to require Nkx2.1 gene function.

Dlx2 Progenitor Migration in Wild Type and Nkx2.1 Mutant Telencephalon