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. 1984 Nov;4(11):2321–2331. doi: 10.1128/mcb.4.11.2321

Expression of tissue-specific Ren-1 and Ren-2 genes of mice: comparative analysis of 5'-proximal flanking regions.

L J Field, W M Philbrick, P N Howles, D P Dickinson, R A McGowan, K W Gross
PMCID: PMC369061  PMID: 6392850

Abstract

All inbred strains of mice carry the Ren-1 structural gene, which encodes the renin-1 isozyme, the classical renin activity found in kidneys. In addition, some strains carry a second renin structural gene, Ren-2, which encodes the predominantly expressed submaxillary gland renin isozyme, renin-2. Ren-1 and Ren-2 exhibit markedly different patterns of tissue-specific expression. In an effort to understand the molecular basis for this differential expression, detailed analysis of the genomic sequences corresponding to the Ren-1 and Ren-2 genes, and the transcripts originating from these loci, was undertaken. Sequence analysis of regions proximal to the structural genes indicated the presence of eucaryotic consensus sequences for transcription. These sequence motifs were strongly conserved between Ren-1 and Ren-2. Approximately 150 bases upstream from the major transcription initiation site, significant differences between these genes were apparent, including the presence of a repetitive DNA element in the Ren-2 copy as well as other breaks in homology and sequence curiosities. Strong homology between Ren-1 and Ren-2 resumed at a point ca. 200 bases further upstream on Ren-1. S1 analysis of submaxillary gland and kidney RNA populations indicated that the majority of transcripts initiate at homologous positions on Ren-1 and Ren-2. On a per cell basis, the accumulation of Ren-1 transcripts in the kidney and Ren-2 transcripts in the submaxillary gland are probably equivalent. These results suggest that it is tissue-specific utilization of the homologous start sites that is critical to their differential patterns of expression. Models which can account for this observation are presented. Interestingly, we found a minor fraction of transcripts initiating 5' to the major transcription start site. These transcripts encoded an open reading frame which may add an additional 23 amino acids to the N-terminus of the renin precursor.

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Selected References

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