A gene from chromosome 4p 16.3 with similarity to a superfamily of transporter proteins

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Abstract
We have previously used exon amplification to identify the ADD1 gene in cosmid Y24 from the Huntington's disease (HD) region of 4p16.3. The same technique has now yielded a second gene from this cosmid. This gene appears to encode a novel member of a superfamily of transporter proteins that includes active and passive transporters in a number of species. The predicted protein of 455 amino acids displays sequence similarity with the E.coli tetracycline resistance efflux protein encoded by cloning vector pBR322, and with a number of related transporters. This gene should open a route to isolating additional mammalian members of this growing superfamily.