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. 1987 Jul 10;15(13):5051–5068. doi: 10.1093/nar/15.13.5051

Characterization of cDNA sequences corresponding to three distinct HMG-1 mRNA species in line CHO Chinese hamster cells and cell cycle expression of the HMG-1 gene.

K L Lee, B T Pentecost, J A D'Anna, R A Tobey, L R Gurley, G H Dixon
PMCID: PMC305947  PMID: 3601666

Abstract

We have isolated cDNA clones encoding the high mobility group (HMG) protein HMG-1 in line CHO Chinese hamster cells. The cDNA clones correspond to the three HMG-1 mRNA species detected on Northern blots. Three different polyadenylation sites are found to be used. The three mRNA species of sizes 1.05, 1.45 and 2.45 kb are generated by differential polyadenylation at sites 115 nucleotides, 513 nucleotides and 1515 nucleotides downstream from the stop codon. A perfectly conserved putative poly(A) signal AAUAAA is present upstream of only one of the three poly(A) sites. Two homologous but imperfect sequences exist upstream from the other two poly(A) sites. All three HMG-1 mRNA species maintain significant levels throughout the M, G1 and S phases of the cell cycle and the rate of large HMG protein (HMG-1 and HMG-2) synthesis increases approximately two-fold from G1 to S phase.

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Selected References

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