Abstract
The rat gene encoding oncomodulin (OM), a small calcium-binding protein, is under the control of a solo LTR derived from an endogenous intracisternal A-particle. The latter sequence is the only OM promoter analyzed so far. In order to study cell-type-specific OM expression in a species lacking LTR sequences in the OM locus, we initially synthesized an OM cDNA from mouse placenta. By sequencing, we found a 137-bp-long 5′ leader region that differed markedly from its rat counterpart but had high similarity to several mouse genomic sequences. Primers specific to this sequence in addition with primers specific for an exon 2/intron 2 sequence were used to screen a mouse ES cell line genomic P1 library. One positive clone contained the whole OM gene, including intron 1 of 25 kb and a 5′ flanking region of 27 kb lacking an LTR. The region upstream of exon 1 contains no TATA or CCAAT boxes but has a homopurine/homopyrimidine stretch of 102 bp as well as a (CA)22 repeat. The latter sequence is polymorphic and was therefore, used to map the OM gene to the distal end of the long arm of mouse Chromosome (Chr) 5 by interspecific backcross analysis. Additonally we localized the OM gene by in situ hybridization to the region G1-3 on Chr 5, confirming the genetic linkage results. Finally, the OM gene was found to be structurally conserved and to exist in a single copy in mammals.
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Staubli, F., Klein, A., Rentsch, J.M. et al. Structure and chromosomal localization of the mouse oncomodulin gene. Mammalian Genome 6, 769–777 (1995). https://doi.org/10.1007/BF00539001
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DOI: https://doi.org/10.1007/BF00539001