TY - JOUR
T1 - Gene expression in cortical interneuron precursors is prescient of their mature function
AU - Batista-Brito, Renata
AU - MacHold, Robert
AU - Klein, Corinna
AU - Fishell, Gord
N1 - Funding Information:
Research in the Fishell laboratory was supported by the Simons Foundation, the National Institutes of Health; National Institute of Mental Health; National Institute of Neurological Disorders and Stroke (R01 MH068469, R01NS039007). Science and Technology Foundation of Portugal grant to R. B. B.
PY - 2008/10
Y1 - 2008/10
N2 - At present little is known about the developmental mechanisms that give rise to inhibitory γ-aminobutyric acidergic interneurons of the neocortex or the timing of their subtype specification. As such, we performed a gene expression microarray analysis on cortical interneuron precursors isolated through their expression of a Dlx5/6Cre-IRES-EGFP transgene. We purified these precursors from the embryonic mouse neocortex at E13.5 and E15.5 by sorting of enhanced green fluorescent protein-expressing cells. We identified novel transcription factors, neuropeptides, and cell surface genes whose expression is highly enriched in embryonic cortical interneuron precursors. Our identification of many of the genes known to be selectively enriched within cortical interneurons validated the efficacy of our approach. Surprisingly, we find that subpopulations of migrating cortical interneurons express genes encoding for proteins characteristic of mature interneuron subtypes as early as E13.5. These results provide support for the idea that many of the genes characteristic of specific cortical interneuron subtypes are evident prior to their functional integration into cortical microcircuitry. They suggest interneurons are already relegated to specific genetic subtypes shortly after they become postmitotic. Moreover, our work has revealed that many of the genes expressed in cortical interneuron precursors have been independently linked to neurological disorders in both mice and humans.
AB - At present little is known about the developmental mechanisms that give rise to inhibitory γ-aminobutyric acidergic interneurons of the neocortex or the timing of their subtype specification. As such, we performed a gene expression microarray analysis on cortical interneuron precursors isolated through their expression of a Dlx5/6Cre-IRES-EGFP transgene. We purified these precursors from the embryonic mouse neocortex at E13.5 and E15.5 by sorting of enhanced green fluorescent protein-expressing cells. We identified novel transcription factors, neuropeptides, and cell surface genes whose expression is highly enriched in embryonic cortical interneuron precursors. Our identification of many of the genes known to be selectively enriched within cortical interneurons validated the efficacy of our approach. Surprisingly, we find that subpopulations of migrating cortical interneurons express genes encoding for proteins characteristic of mature interneuron subtypes as early as E13.5. These results provide support for the idea that many of the genes characteristic of specific cortical interneuron subtypes are evident prior to their functional integration into cortical microcircuitry. They suggest interneurons are already relegated to specific genetic subtypes shortly after they become postmitotic. Moreover, our work has revealed that many of the genes expressed in cortical interneuron precursors have been independently linked to neurological disorders in both mice and humans.
KW - Cortical interneurons
KW - Subtype specification
KW - Transcriptional code
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U2 - 10.1093/cercor/bhm258
DO - 10.1093/cercor/bhm258
M3 - Article
C2 - 18250082
AN - SCOPUS:58149195774
SN - 1047-3211
VL - 18
SP - 2306
EP - 2317
JO - Cerebral Cortex
JF - Cerebral Cortex
IS - 10
ER -