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

Slow as molasses is required for polarized membrane growth and germ cell migration in Drosophila.

Drosophila germ cell migration is directed by attractive and repulsive guidance cues. We have identified a novel gene, slow as molasses (slam), which is required for germ cell migration. In slam zygotic mutants, germ cells fail to transit off the midgut into the mesoderm. We show that slam is required at this stage in parallel to HMG Coenzyme A reductase, a previously identified germ cell migration gene. Removal of both zygotic and maternal slam results in an earlier defect: a failure to form a cellular blastoderm. Consistent with this phenotype, we found that slam is one of the earliest genes to be transcribed in the embryo, and Slam protein localizes to the growing basal-lateral membrane during blastoderm formation, but Slam is not detected during later stages of embryogenesis. Because slam RNA and protein are expressed earlier than the time when we observe defects in germ cell migration, we propose that Slam is required for the localization of a signal to the basal side of blastoderm cells that is needed later in the posterior midgut to guide germ cells.[1]


  1. Slow as molasses is required for polarized membrane growth and germ cell migration in Drosophila. Stein, J.A., Broihier, H.T., Moore, L.A., Lehmann, R. Development (2002) [Pubmed]
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