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Genetic control of morphogenesis - Hox induced organogenesis of the posterior spiracles

AuthorsCastelli-Gair Hombría, James ; Rivas, María Luisa ; Sotillos, Sol
KeywordsPosterior spiracles
Hox gene
Drosophila melanogaster
Drosophila proteins
Homeodomain proteins
Issue Date24-Nov-2008
PublisherUniversity of British Columbia Press
CitationInternational Journal of Development Biology 53: 1349-1358 (2009)
AbstractThe posterior spiracle has become one of the best systems to study how Hox genes control morphogenesis. Interaction of Abdominal-B (ABD-B) with dorso ventral and intrasegmental positional information leads to the local activation of ABD-B primary targets in the dorsal region of the eighth abdominal segment (A8). Primary targets pattern the spiracle subdividing it into two broad areas: external stigmatophore vs. internal spiracular chamber precursor cells. Primary targets then activate secondary targets and modulate the expression of signalling molecules in the spiracle primordium creating unique spiracle positional values. This genetic cascade activates the “realisator” genes that modulate the cell behaviours causing invagination, elongation and cell rearrangements responsible for spiracle morphogenesis. The spiracle realisators that have been identified to date correspond to cell adhesion proteins, cytoskeleton regulators and cell polarity molecules. Interestingly, these realisators localise to different apico-basal locations in the cell (RhoGEF apical, Crumbs subapical, E-cadherin in the adherens junction, RhoGAP basolateral). Therefore, the Hox anterior-posterior code is converted in the cell into apico-basal information required to implement the posterior spiracle morphogenetic program. We believe this may be a common characteristic for Hox induced organogenesis.
Description10 páginas, 5 figuras.
Publisher version (URL)http://dx.doi.org/10.1387/ijdb.072421jc
Appears in Collections:(CABD) Artículos
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