Dictyostelium RasD is required for normal phototaxis, but not differentiation.

@article{Wilkins2000DictyosteliumRI,
  title={Dictyostelium RasD is required for normal phototaxis, but not differentiation.},
  author={Andrew S. Wilkins and Meenal Khosla and Donald J Fraser and George B. Spiegelman and Paul R Fisher and Gerald R. Weeks and Robert H Insall},
  journal={Genes & development},
  year={2000},
  volume={14 11},
  pages={1407-13}
}
RasD, a Dictyostelium homolog of mammalian Ras, is maximally expressed during the multicellular stage of development. Normal Dictyostelium aggregates are phototactic and thermotactic, moving towards sources of light and heat with great sensitivity. We show that disruption of the gene for rasD causes a near-total loss of phototaxis and thermotaxis in mutant… CONTINUE READING