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Development, Vol 122, Issue 7 2109-2116, Copyright © 1996 by Company of Biologists
JOURNAL ARTICLES |
L Manseau, J Calley and H Phan
Department of Molecular and Cellular Biology, Universiity of Arizona, Tucson, AZ 85721, USA. lynn_manseau@tikal.biosci.arizona.edu
We have investigated the role of the actin cytoskeleton during mid-oogenesis and have found that disrupting the actin cytoskeleton with cytochalasin D induces microtubule bundling and microtubule-based cytoplasmic streaming within the oocyte, similar to that which occurs prematurely in cappuccino and spire mutant oocytes. After examining a number of mutants that affect the actin cytoskeleton, we have found that chickadee, which encodes the actin-binding protein, profilin, shares this phenotype. In addition to the microtubule misregulation, mutants in chickadee resemble cappuccino in that they fail to localize STAUFEN and oskar mRNA to the posterior pole of the developing oocyte. Also, a strong allele of cappuccino has multinucleate nurse cells, similar to those previously described in chickadee. In an independent line of experiments, we have identified profilin as a CAPPUCCINO interactor in a two-hybrid screen for proteins that bind to CAPPUCCINO. This, together with the similarity of mutant phenotypes, suggests that profilin and CAPPUCCINO may interact during development.
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