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Development, Vol 121, Issue 11 3713-3721, Copyright © 1995 by Company of Biologists
JOURNAL ARTICLES |
K Weigmann and CF Lehner
Friedrich-Miescher-Laboratorium, Max-Planck-Gesellschaft, Tubingen, FRG.
The correct specification of defined neurons in the Drosophila central nervous system is dependent on even-skipped. During CNS development, even-skipped expression starts in the ganglion mother cell resulting from the first asymmetric division of neuroblast NB 1-1. This first division of NB 1-1 (and of the other early neuroblasts as well) is temporally controlled by the transcriptional regulation of string expression, which we have manipulated experimentally, even-skipped expression still occurs if the first neuroblast division is delayed, but not if the division is prohibited. Moreover, even-skipped expression is also dependent on progression through S phase which follows immediately after the first division. However, cytokinesis during the first NB division is not required for even-skipped expression as revealed by observations in pebble mutant embryos. Our results demonstrate therefore that even-skipped expression is coupled to cell cycle progression, presumably in order to prevent a premature activation of expression by a positive regulator which is produced already in the neuroblast during G2 and segregated asymmetrically into the ganglion mother cell during mitosis.
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