PMID: 9651493Jul 4, 1998Paper

Homeotic regulation of segment-specific differences in neuroblast numbers and proliferation in the Drosophila central nervous system

Mechanisms of Development
A ProkopG M Technau

Abstract

The number and pattern of neuroblasts that initially segregate from the neuroectoderm in the early Drosophila embryo is identical in thoracic and abdominal segments. However, during late embryogenesis differences in the numbers of neuroblasts and in the extent of neuroblast proliferation arise between these regions. We show that the homeotic genes Ultrabithorax and abdominal-A regulate these late differences, and that misexpression of either gene in thoracic neuroblasts after segregation is sufficient to induce abdominal behaviour. However, in wild type embryos we only detect abdominal-A and Ultrabithorax proteins in early neuroblasts. Furthermore, transplantation experiments reveal that segment-specific behaviour is determined prior to neuroblast segregation. Thus, the segment-specific differences in neuroblast behaviour seem to be determined in the early embryo, mediated through the expression of homeotic genes in early neuroblasts, and executed in later programmes controlling neuroblast numbers and proliferation.

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Citations

Apr 20, 2013·Nature Protocols·Boris EggerSimon G Sprecher
Jan 24, 2009·Proceedings of the National Academy of Sciences of the United States of America·Mari PalgiTapio I Heino
Mar 7, 2012·Proceedings of the National Academy of Sciences of the United States of America·Lyubov Veverytsa, Douglas W Allan
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Oct 24, 2018·Journal of Developmental Biology·Katherine Harding, Kristin White

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