Cerebral Cortex, Vol. 9, No. 6, 543-550,
September 1999
© 1999 Oxford University Press
Dual Role of Brain Factor-1 in Regulating Growth and Patterning of the Cerebral Hemispheres
Cell Biology Program, Memorial Sloan–Kettering Cancer Center, New York, NY 10021, USA
Brain factor-1 (BF-1) is a winged-helix (WH) transcription factor with a restricted pattern of expression in the neural tube. In the embryo, BF-1 is localized to the progenitor cells of the most rostral neural tube, the telencephalic neuroepithelium. Expression of BF-1 persists in the adult brain in the structures derived from the telencephalon, including the cerebral cortex, the hippocampus, the olfactory bulbs and the basal ganglia. Targeted disruption of the BF-1 gene in mice results in hypoplasia of the cerebral hemispheres. Proliferation of the telencephalic neuroepithelium is decreased and neuronal differentiation occurs prematurely. The forebrain of the BF-1 (–/–) mutant also displays dorsal–ventral patterning defects. Development of the ventral (basal) region of the telencephalon is more severely affected than the dorsal region. These anomalies are associated with the ectopic expression of BMP4 in the dorsal telencephalic neuroepithelium and the loss of shh in the ventral telencephalon. These results raise the possibility that BF-1 may modulate both progenitor cell proliferation and regional patterning by regulating the expression or activity of inductive signals which act on the telencephalic neuroepithelium.
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