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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Expression and exon/intron organization of two medaka fish homologs of the mammalian guanylyl cyclase A.

Two cDNA clones (OlGC2 and OlGC7) and their genomic DNA clones encoding medaka fish homologs of mammalian natriuretic peptide receptor/membrane guanylyl cyclase A (GC-A) were isolated, and their complete nucleotide sequences were determined. The open reading frame predicts a protein of 1,063 amino acids for OlGC2 cDNA (4,283 bp), and one of 1,055 amino acids for OlGC7 cDNA (3,721 bp), respectively. Northern blot analyses demonstrated 4.7 kb OlGC2 transcripts in the kidney and gill, and 4.0 kb OlGC7 transcripts in the kidney, brain, and ovary, while RNase protection analyses revealed that both genes are expressed in various adult organs. Both the OlGC2 (about 33.0 kbp) and OlGC7 (about 44.3 kbp) genes consist of 22 exons with an exon/intron organization similar to those of the human GC-A gene (about 16.6 kbp) and medaka fish GC-B homolog gene (OlGC1, about 93 kbp). Intron 4 of OlGC2 contains two repeated sequence (RS) clusters, designated as RS1 (about 1 kbp) and RS2 (about 5 kbp), consisting of nucleotide 5'-AGCCTCTGCTCCTCCTTC-3'. In addition, many identical but variably sized nucleotide sequences were found in introns in OlGC1, OlGC2, OlGC6, and OlGC7. The OlGC2 and OlGC7 genes both have no apparent TATA box in the 5' flanking region upstream of the putative transcription initiation point, but several consensus sequences for cis-regulatory elements, including C/ EBP, CREB, NF-IL6, and Sp1 and AP-2, NF-IL6, c-Myb, and Sp1 are present in the 5'-flanking region of OlGC2 and OlGC7, respectively.[1]


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