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A novel Dictyostelium gene encoding multiple repeats of adhesion inhibitor-like domains has effects on cell-cell and cell-substrate adhesion.

Dev. Biol.2002 Mar 15;243(2):226-48
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摘要


The Dictyostelium protein AmpA (adhesion modulation protein A) is encoded by the gene originally identified by the D11 cDNA clone. AmpA contains repeated domains homologous to a variety of proteins that influence cell adhesion. The protein accumulates during development, reaching a maximal level at the finger stage. Much of the AmpA protein is found extracellularly during development, and in culminants, AmpA is found in association with anterior-like cells. Characterization of an ampA- strain generated by gene replacement reveals a significant increase in cell-cell clumping when cells are starved in nonnutrient buffer suspensions. Developing ampA- cells are also more adhesive to the underlying substrate and are delayed in developmental progression, with the severity of the delay increasing as cells are grown in the presence of bacteria or on tissue culture dishes rather than in suspension culture. Reintroduction of the ampA gene rescues the developmental defects of ampA- cells; however, expression of additional copies of the gene in wild-type cells results in more severe developmental delays and decreased clumping in suspension culture. We propose that the AmpA protein functions as an anti-adhesive to limit cell-cell and cell-substrate adhesion during development and thus facilitates cell migration during morphogenesis.

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