The functional intronless S-adenosylmethionine decarboxylase gene of the mouse (Amd-2) is linked to the ornithine decarboxylase gene (Odc) on Chromosome 12 and is present in distantly related species of the genus Mus |
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Authors: | Kent Persson Olle Heby Franklin G Berger |
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Institution: | Department of Cellular and Developmental Biology, Ume? University, S-901 87 Ume?, Sweden, SE Department of Biological Sciences, University of South Carolina, Columbia, South Carolina 29208, USA, US
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Abstract: | S-Adenosylmethionine decarboxylase (AdoMetDC) is a key enzyme in the biosynthesis of polyamines. We have previously identified
a mouse AdoMetDC gene that exhibits the hallmarks of a retroposon; that is, it has no introns, is flanked by direct repeats,
and has a poly(dA) tract at its 3′-end. This gene, termed Amd-2, is not a processed pseudogene; rather, it is transcribed in a variety of mouse tissues and encodes a functional enzyme. In
the current report, we present the sequence of a 6.7-kb genomic segment of the Amd-2 locus. Several sequences of interest, including an intercisternal A particle (IAP) element, a transposon-related sequence,
and several expressed sequence tags (ESTs), were found within or near Amd-2. We also show, through analysis of an interspecific backcross, that Amd-2 is located on Chr 12, tightly linked to the gene (Odc) that encodes ornithine decarboxylase, another key enzyme in polyamine synthesis. Finally, we show that Amd-2 is present among several divergent species of the genus Mus. Thus, the integration event that generated Amd-2 may have occurred early during Mus evolution.
Received: 1 December 1998 / Accepted: 31 March 1999 |
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