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XB-ART-17562
Nucleic Acids Res 1996 Oct 15;2420:4078-83. doi: 10.1093/nar/24.20.4078.
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Regulated nuclear polyadenylation of Xenopus albumin pre-mRNA.

Rao MN , Chernokalskaya E , Schoenberg DR .


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Cytoplasmic regulation of the length of poly(A) on mRNA is a well-characterized process involved in translational control during development. In contrast, there is no direct in vivo evidence for regulation of the length of poly(A) added during nuclear pre-mRNA processing in somatic cells. We previously reported that Xenopus serum albumin [Schoenberg et al. (1989) Mol. Endocrinol. 3, 805-815] and transferrin [Pastori et al. (1992) J. Steroid Biochem. Mol. Biol. 42, 649-657], mRNA have exceptionally short poly(A) tails ranging from 12 to 17 residues, whereas vitellogenin mRNA has long poly(A). An RT-PCR protocol was adapted to determine the length of poly(A) added onto pre-mRNA, defined here as that species bearing the terminal intron. Using this assay we show that vitellogenin pre-mRNA has the same long poly(A) tail as mature vitellogenin mRNA. In contrast, albumin pre-mRNA has the same short poly(A) as found on fully-processed albumin mRNA. These results indicate that the short poly(A) tail on albumin mRNA results from regulation of poly(A) addition during nuclear 3' processing.

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Species referenced: Xenopus
Genes referenced: tbx2 tf

References [+] :
Baurén, Splicing of Balbiani ring 1 gene pre-mRNA occurs simultaneously with transcription. 1994, Pubmed