Abstract
We have used the polymerase chain reaction (PCR) to amplify, clone and sequence homologues of the Drosophila segment polarity genes engrailed ( en), cubitus interruptus Dominant ( ci D ) and wingless ( wg) from the genome of the brachiopod, Terebratulina retusa (Linnaeus). The deduced translation products of brachiopod en and ci D share high levels of sequence identity with their Drosophila homologues. The brachiopod wg-related clone is divergent from Drosophila wg, although clearly a member of the wg/Wnt gene family. These results indicate that structural diversity of Drosophila segment polarity genes has been evolutionarily conserved in a divergent, ancient and unsegmented animal phylum.
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