Abstract
Nucleated erythroid cells were incubated for 10 min in the presence of [5-3H]uridine, and the total RNA was isolated by three different extraction procedures. RNA containing globin messenger RNA sequences was purified from other cellular RNAs by selective hybridization to globin complementary DNA cellulose. Depending upon the extraction procedure employed, 0.4-0.6% of the radioactively-labeled total cellular RNA applied to the column annealed to globin complementary DNA cellulose. The annealed RNA was treated with formaldehyde and analyzed by formaldehyde/polyacrylamide gel electrophoresis. Mature globin mRNA and an RNA migrating at approximately 15 S were observed. No globin mRNA containing sequences larger than 20 S were present. The 15S RNA was partially resolved from mature globin mRNA by neutral sucrose density gradient centrifugation. The RNA isolated from the heavy region of this gradient migrated as 15 S in the formaldehyde/polyacrylamide gels and retained its ability to quantitatively anneal to globin complementary DNA cellulose. On the basis of these observations, we conclude that nucleated erythroid cells obtained from the spleens of anemic mice have a 15S RNA which contains globin mRNA sequences. The 15S RNA is not an aggregate and is a good candidate for a globin mRNA precursor.
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