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Am J Physiol Renal Physiol 266: F155-F161, 1994;
0363-6127/94 $5.00
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AJP - Renal Physiology, Vol 266, Issue 1 155-F161, Copyright © 1994 by American Physiological Society

ARTICLES

Spatially restricted expression of set mRNA in developing rat kidney

E. G. Kim, M. E. Choi and B. J. Ballermann
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.

A somatic translocation event fusing the novel gene set to the putative oncogene can has been implicated in the development of acute nonlymphocytic leukemia in humans. In this study, full-length cDNAs highly homologous with human set were cloned from a rat neonatal kidney library. The expression pattern of set mRNA was then examined in developing rat kidney. Two groups of set cDNAs (alpha and beta) with different translation initiation sites and open reading frames of 867 and 831 bp, respectively, were found. The predicted protein products are 33,385 and 32,085 Da in size and contain approximately 30% acidic residues, over half of them clustered at the COOH terminal, thus forming a long acidic tail. No signal peptide or membrane-spanning domains were identified, suggesting an intracellular protein product. By ribonuclease protection assay, both alpha and beta variants of set were expressed in kidney. On Northern blots of total kidney RNA, 3.0- and 2.2-kb mRNAs hybridized with the labeled set cDNA probe. Expression of both transcripts was four- to eightfold greater in neonatal compared with adult rat kidney. When neonatal rat kidneys were examined for set mRNA expression by in situ hybridization with 35S-labeled riboprobe, expression was densely localized in the cortical region of morphogenesis over primitive nephron structures, including S-shaped bodies. Thus mRNA for Set, a putative intracellular protein involved in leukemogenesis, is expressed in kidney.(ABSTRACT TRUNCATED AT 250 WORDS)


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