Lemon encodes an unusual receptor protein-tyrosine kinase expressed during gametogenesis in Hydra.
In a screen for receptor protein-tyrosine kinase ( RTK) genes expressed during gametogenesis in the cnidarian Hydra vulgaris, we isolated a cDNA encoding Lemon, an RTK with unusual features. Lemon is orthologous to Drosophila Dtrk, chicken Klg, and human colon carcinoma kinase-4. These genes constitute an RTK class characterized by a conserved transmembrane sequence, the presence of extracellular immunoglobulin-like repeats, and the absence of the DFG motif in the kinase domain. We provide evidence that Lemon is a component of an unusual RTK signal transduction mechanism that may involve transmembrane domain-mediated interactions and may not be dependent on its own catalytic activity. Lemon transcription is dynamically regulated in interstitial cells during asexual budding and gametogenesis. Transcriptional up-regulation occurs early in spermatogenesis and oogenesis concurrent with the local accumulation of interstitial cells in the body column of sexual polyps.[1]References
- Lemon encodes an unusual receptor protein-tyrosine kinase expressed during gametogenesis in Hydra. Miller, M.A., Steele, R.E. Dev. Biol. (2000) [Pubmed]
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