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. 1981 Jul;78(7):4073–4077. doi: 10.1073/pnas.78.7.4073

Introduction by molecular cloning of artifactual inverted sequences at the 5' terminus of the sense strand of bovine parathyroid hormone cDNA.

C A Weaver, D F Gordon, B Kemper
PMCID: PMC319728  PMID: 6170060

Abstract

To study the structure and function of the gene for parathyroid hormone, we obtained recombinant plasmids containing bovine parathyroid hormone cDNA. The nucleotide sequence at the 5' terminus (relative to the sense strand) of the cDNA insert in a recombinant plasmid, pPTHi4, was different from that previously reported for the bovine parathyroid hormone cDNA insert of another recombinant plasmid, pPTHm1 [Kronenberg, H. M., McDevitt, B. F., Majzoub, J. A., Nathans, J., Sharp, P. A., Potts, J. T., Jr. & Rich, A. (1979) Proc. Natl. Acad. Sci. USA 76, 4981-4985]. The first 50 nucleotides of the pPTHm1 insert were an inverted complement of nucleotides 2-51 of the pPTHi4 insert. the cDNA insert of another plasmid, pPTHi8, contained a sequence identical to nucleotides 2-51 of the pPTHi4 insert but also contained an additional 42 bases at the 5' terminus. The first 41 bases of the pPTHi8 insert were an inverted repeat of an internal sequence of the pPTHi4 insert corresponding to nucleotides 184-224. Restriction endonuclease analysis of pPTHi8 indicated that the internal sequence corresponding to this region was retained. The nucleotide sequence of a restriction fragment hybridized to parathyroid hormone mRNA and extended toward the 5' terminus of the mRNA with reverse transcriptase confirmed that the sequence at the 5' terminus of the pPTHi4 insert was an accurate copy of the parathyroid hormone mRNA sequence. These data suggest that two types of sequence rearrangements may occur at the 5' terminus, as occurred in pPTHm1, and (ii) an inverted repeat of an internal sequence, as occurred in pPTHi8.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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