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A subpopulation of dorsal lateral/caudal ganglionic eminence-derived neocortical interneurons expresses the transcription factor Sp8.

  • Tong Ma‎ et al.
  • Cerebral cortex (New York, N.Y. : 1991)‎
  • 2012‎

Cortical GABAergic interneurons in rodents originate from subpallial progenitors and tangentially migrate to the cortex. While the majority of mouse neocortical interneurons are derived from the medial and caudal ganglionic eminence (MGE and CGE, respectively), it remains unknown whether the lateral ganglionic eminence (LGE) also contributes to a subpopulation of cortical interneurons. Here, we show that the transcription factor Sp8 is expressed in one-fifth of adult cortical interneurons, which appear to be derived from both the dorsal LGE and the dorsal CGE (dLGE and dCGE, respectively). Compared with the MGE-derived cortical interneurons, dLGE/dCGE-derived Sp8-expressing (Sp8+) ones are born at later embryonic stages with peak production occurring at embryonic day 15.5. They tangentially migrate mainly along the subventricular/intermediate zone (SVZ/IZ) route; some continue to express mitotic markers (Ki67 and PH3) in the neonatal cortical SVZ/IZ. Sp8+ interneurons continue to radially migrate from the SVZ/IZ into the cortical layers at early postnatal stages. In contrast to MGE-derived interneurons, dLGE/dCGE-derived Sp8+ interneurons follow an outside-in layering pattern, preferentially occupying superficial cortical layers.


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