dally, a Drosophila member of the glypican family of integral membrane proteoglycans, affects cell cycle progression and morphogenesis via a Cyclin A-mediated process.

Abstract:

:division abnormally delayed (dally) encodes an integral membrane proteoglycan of the glypican family that affects a number of patterning events during both embryonic and larval development. Earlier studies demonstrated that Dally regulates cellular responses to Wingless (Wg) and Decapentaplegic (Dpp) in a tissue-specific manner, consistent with its proposed role as a growth factor co-receptor. dally mutants also display cell cycle progression defects in specific sets of dividing cells in the developing optic lobe and retina. The affected cells in the retina and lamina show delays in completion of the G2-M segment of the cell cycle. We have investigated the molecular basis of dally-mediated cell division defects by examining the genetic interactions between dally and known cell cycle regulators. Reductions in cyclin A but not cyclin B or string expression, suppress dally cell division defects in the optic lobe. cycA mutations also dominantly rescue many dally adult morphological defects including lethality, phenotypes that are unaffected by reducing cycB function. dally mutants show abnormal Cyclin A expression in the dividing cells affected, with appreciable levels of Cyclin A remaining in late prophase and metaphase, stages where Cyclin A is normally absent. Given that Dally is known to regulate the activity of secreted growth factors our findings suggest that extracellular cues influence the degradation of Cyclin A in a manner that controls cell cycle progression and ultimately, cell division patterning.

journal_name

J Cell Sci

journal_title

Journal of cell science

authors

Nakato H,Fox B,Selleck SB

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

123-30

issue

Pt 1

eissn

0021-9533

issn

1477-9137

journal_volume

115

pub_type

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