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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

AFR1 acts in conjunction with the alpha-factor receptor to promote morphogenesis and adaptation.

Mating pheromone receptors activate a G-protein signaling pathway that induces changes in transcription, cell division, and morphogenesis needed for the conjunction of Saccharomyces cerevisiae. The C terminus of the alpha-factor pheromone receptor functions in two complex processes, adaptation and morphogenesis. Adaptation to alpha-factor may occur through receptor desensitization, and alpha-factor-induced morphogenesis forms the conjugation bridge between mating cells. A plasmid overexpression strategy was used to isolate a new gene, AFR1, which acts together with the receptor C terminus to promote adaptation. The expression of AFR1 was highly induced by alpha-factor. Unexpectedly, cells lacking AFR1 showed a defect in alpha-factor-stimulated morphogenesis that was similar to the morphogenesis defect observed in cells producing C-terminally truncated alpha-factor receptors. In contrast, AFR1 overexpression resulted in longer projections of morphogenesis, which suggests that this gene may directly stimulate morphogenesis. These results indicate that AFR1 encodes a developmentally regulated function that coordinates both the regulation of receptor signaling and the induction of morphogenesis during conjugation.[1]


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