Cloning and analysis of the 5'-flanking region of rat Na+/K(+)-ATPase alpha 1 subunit gene.
We cloned a 13.3 kilobase (kb) fragment of genomic DNA spanning at least the first two exons of the rat Na+/K(+)-ATPase alpha 1 subunit gene (NKAA1) and 1.5 kb of the 5'-flanking region. S1 nuclease mapping analysis of the 5' end of the Na+/K(+)-ATPase mRNA indicated that the transcription initiation site was located 262 base pairs (bp) upstream of the translation initiation codon. The transcription initiation site of the Na+/K(+)-ATPase alpha 1 subunit gene was identical among six tissues of adult rat (kidney, brain, heart, thyroid, liver and lung). A TATA-box-like sequence (at position -32), two Sp1 factor binding sequences (-137, -56), an active transcription factor consensus binding sequence (-71) and two glucocorticoid-responsive element half consensus sequences (-750, -481) were found in the 5'-flanking region. The sequence of the first exon and the 5'-flanking region of the rat NKAA1 was 63% homologous to that of the horse equivalent. Maximum homology (82%) between the two genes was observed in the region from 361 bp upstream of the translation initiation site to the 3' end of the first exon. The TATA-like box, Sp1 binding site and the active transcriptional factor (ATF) consensus site in this region were conserved in both rat and horse.
Yagawa
Y
Y
Department of Biology, Jichi Medical School, Tochigi, Japan.
Kawakami
K
K
Nagano
K
K
D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D005091:Exons; D005260:Female; D005796:Genes; D008969:Molecular Sequence Data; D051381:Rats; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D000254:Sodium-Potassium-Exchanging ATPase / Q000235:genetics*; D014158:Transcription, Genetic
D000254:Sodium-Potassium-Exchanging ATPase