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- W2033201924 abstract "Myostatin is a paracrine/autocrine factor that inhibits muscle growth, and mutations that affect myostatin activity or expression produce dramatic increases in muscle mass in several species. However, at present it is less clear whether differences in myostatin expression or activity exist between species with differing body sizes. Here we demonstrate that mouse muscle expresses far greater levels of myostatin mRNA than cow. In addition, activity of a 1200 bp mouse myostatin promoter construct was significantly greater than that of a 1200 bp cow myostatin promoter construct in C(2)C(12) myotubes. In contrast, activity of reporter constructs flanked by one or both untranslated regions (UTRs) was not significantly different between the two species. Sequence analysis identified a number of promoter regions which differed between larger species (cow, pig, goat, sheep, human) and smaller (mouse, rat), including a TATA-box sequence, a CACCC box, two AT-rich regions (AT1 and AT2), and a palindromic sequence (PAL). We therefore used mutagenesis to alter the mouse sequence for each of these elements to that of the cow. Mutagenesis of the TATA, CACC, and AT1 sequences of the mouse to those of the cow significantly decreased activity of the mouse myostatin promoter compared to the wild type mouse promoter, while mutation of the AT2 and PAL sequences tended to increase promoter activity. Finally, the cow myostatin promoter was less responsive to FoxO signaling than the mouse myostatin promoter. Together these data support the hypothesis that differences in promoter activity between mouse and cow may contribute to differences in expression of the myostatin gene between these species." @default.
- W2033201924 created "2016-06-24" @default.
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- W2033201924 date "2008-08-01" @default.
- W2033201924 modified "2023-09-27" @default.
- W2033201924 title "Comparative functional analysis of the cow and mouse myostatin genes reveals novel regulatory elements in their upstream promoter regions" @default.
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- W2033201924 doi "https://doi.org/10.1016/j.cbpb.2008.05.002" @default.
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