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Genomic clones coding for one of the two identified Artemia franciscana Na/K-ATPase alpha subunits, the alpha 1 subunit, have been isolated. Several overlapping clones were obtained, although their restriction maps showed a large heterogeneity. Sequencing of their exons showed that they differ in up to 3.46% of their nucleotides in translated regions and 8.18% in untranslated regions. Southern blot analysis of DNA purified from different lots of A. franciscana cysts and from isolated individuals suggests that the variation is due to the existence of multiple Na/K-ATPase alpha 1 subunit alleles in A. franciscana. The Na/K-ATPase alpha 1 subunit gene is divided into 15 exons. Ten of the 14 introns are located in identical positions in this gene as in the human Na/K-ATPase alpha 3 subunit gene. Analysis of the 5' flanking region of the gene has allowed identification of the transcription-initiation sites. The adjacent upstream region has been shown to have functional promoter activity in cultured mammalian cells, suggesting the evolutionary conservation of some of the promoter regulatory sequences.

Polymorphism and structure of the gene coding for the α1 subunit of the Artemia franciscana Na/K-ATPase