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. 1994 Oct 15;303(Pt 2):547–553. doi: 10.1042/bj3030547

Translation initiation on the insulin-like growth factor II leader 1 is developmentally regulated.

H Teerink 1, M A Kasperaitis 1, C H De Moor 1, H O Voorma 1, A A Thomas 1
PMCID: PMC1137362  PMID: 7980416

Abstract

The majority of cellular mRNAs have relatively short and unstructured 5' untranslated regions (UTRs) that allow efficient translation, such as the beta-globin mRNA. An exception to this rule is the group of growth factor mRNAs which, in general, have long 5' UTRs with a high G + C content. An example is insulin-like growth factor II (IGF-II), which is encoded by four mRNAs, arising from four different promoters. Transcripts having the human IGF-II leader 1 are only expressed in adult liver where IGF-II protein synthesis is solely under direction of this 5' UTR. We investigated the translational efficiency in vitro of this 5' UTR, linked to the chloramphenicol acetyltransferase (CAT) encoding region. As expected from the primary structure of IGF-II leader 1, translational efficiency was very low compared with beta-globin 5' UTR-CAT mRNA. Addition of cell extract from undifferentiated P19 embryonal carcinoma (EC) cells preferentially stimulated translation of an IGF-II 5' UTR RNA construct. No translational stimulation was found when cell extract from differentiated P19 EC cells was added. In contrast with the beta-globin 5' UTR, translation initiation on the IGF-II 5' UTR was not dependent on the presence of a cap structure. The results imply that only in undifferentiated P19 EC cells and not in their differentiated derivatives is a factor present that specifically stimulates IGF-II RNA translation, thereby suggesting translational regulation of IGF-II production during early embryonic development. A mechanism for translation initiation on the 5' UTR of IGF-II is discussed.

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