Molecular mechanisms of nucleotide-sequence rearrangements in cDNA clones of human fibroblast interferon mRNA

Gene
G VolckaertW Fiers

Abstract

The characterization and nucleotide sequencing of cDNA clones of human fibroblast interferon (HFIF) mRNA (Derynck et al., 1980) revealed two types of structural inversions :(i) an inverted repeat of a 3'-proximal segment at the 5'end, or (ii) an inverted 5'-terminal segment. Based on the nucleotide sequence of these inverted clones, we have deduced molecular mechanisms to explain how the rearrangements could have arisen. We propose that the usual small 3'-terminal hairpin does not form after the reverse transcription produces the first cDNA strand. Instead, base pairing occurs between the 3'-terminal segment and the more distal region of the first cDNA strand, forming a much larger hairpin loop. Second-strand synthesis followed by either nicking or unfolding of the loop structure and continuation of the polymerase reaction would lead to the observed types of inversions. The 5'-truncated clone, pHFIF-1, whose new 5'-terminal sequence diverges from that of the corresponding region in the mRNA, can also be explained by such a mechanism.

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