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J Mol Evol
1989 Oct 01;294:314-27. doi: 10.1007/bf02103619.
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Structural analysis of the uEGF gene in the sea urchin strongylocentrotus purpuratus reveals more similarity to vertebrate than to invertebrate genes with EGF-like repeats.
Delgadillo-Reynoso MG
,
Rollo DR
,
Hursh DA
,
Raff RA
.
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The gene uEGF, a member of the epidermal growth factor family in the sea urchin Stronglyocentrotus purpuratus, is known to express two transcripts that are regulated developmentally in the embryo. We have partially sequenced several uEGF genomic and cDNA clones. We suggest that the smaller transcript is the result of splicing out an internal region present in the larger mRNA, probably with eight EGF-like repeats. The predicted two uEGF products have a signal peptide followed by an EGF-like repeat and a region with approximately 120 amino acids homologous to domain III in complement component C1s. Following these domains, the short product has 12 tandem EGF-like repeats, whereas the long product has approximately 20 tandem repeats. At the carboxy terminus both products have a region homologous to avidin. Unlike Notch and lin-12, no transmembrane domain was found in uEGF. We also show here that uEGF shares two characteristics with vertebrate members of the EGF family, but not with invertebrate members of the same family. (1) All the EGF-like domains sequenced are represented by single exons. (2) All the introns sequenced follow the first nucleotide of a codon. This supports the hypothesis that the organization of the EGF-like domains in vertebrates and in uEGF derived from a common ancestor. Thus, an alternative molecular datum is provided to support the hypothesis of echinoderm-chordate relationships.
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