Abstract
The insulin-like growth factors (IGF) I and II are single-chain serum proteins of 70 and 67 amino acids, respectively, which are synthesized by the liver and possibly other tissues1–4. They are probably required for normal fetal and postnatal growth and development5–11. They also stimulate the growth of cultured cells, possibly by controlling the progression through the G1 phase of the cell cycle12. In contrast to IGF-II whose concentration does not vary during postnatal development, the serum levels of IGF-I increase several-fold to adult levels during puberty13. The serum concentration of IGF-I is a sensitive monitor of growth hormone levels and is decreased in individuals with growth hormone deficiency and elevated in those with growth hormone-secreting tumours8,14. As a first step in studying the biosynthesis of these proteins and elucidating their role(s) in normal development and in tumorigenesis, we have isolated and sequenced cDNAs prepared from adult human liver mRNA which encode the precursors to IGF-I and -II. We report here the sequence of a cDNA encoding a 180-amino acid protein which is the precursor to IGF-II.
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Bell, G., Merryweather, J., Sanchez-Pescador, R. et al. Sequence of a cDNA clone encoding human preproinsulin-like growth factor II. Nature 310, 775–777 (1984). https://doi.org/10.1038/310775a0
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DOI: https://doi.org/10.1038/310775a0
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