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Proc Natl Acad Sci U S A. 2000 Mar 28;97(7):3292-7.

Dictyostelium amoebae lacking an F-box protein form spores rather than stalk in chimeras with wild type.

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  • 1Department of Anatomy and Cell Biology, Columbia University, 630 West 168th Street, New York, NY 10032, USA.


Using a selection for Dictyostelium mutants that preferentially form spores, we have recovered a mutant called CheaterA. In chimeras with isogenic wild-type cells, the CheaterA mutant preferentially forms viable spores rather than inviable stalk cells. The mutant causes wild-type cells that have begun to express spore-specific genes to accumulate in the prestalk compartment of the developing organism. In the wild-type cells, the chtA transcript is absent in growing cells and appears early in development. No transcript was detected in the mutant by Northern blot. The chtA gene codes for a protein with an F-box and WD40 domains. This class of protein usually forms part of an Skp1, cullin, F-box (SCF) complex that targets specific protein substrates for ubiquitination and degradation.

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