Characterization of a rat insulin-like growth factor I gene promoter

Rat IGF-I mRNAs contain one of two alternative 5-untranslated regions which are encoded by alternative exons (exons 1 and 2) and whose expression is controlled by alternative promoter elements. We investigated the ability of fragments of DNA which contain exon 1 and its 5-flanking region to regulate transcription of a luciferase reporter gene in transient transfection assays. Maximal promoter activity was obtained with a construct which contained 412 bp of 5-flanking region while constructs which contained 1120 and 1690 bp of 5-flanking region induced 50% less enzymatic activity. Mapping of transcription start sites by RNase protection assay demonstrated that native start sites were used by these constructs, although the relative use of different start sites was different from start site usage by the endogenous gene. These data demonstrate that the 5-flanking region of exon 1 is capable of regulating transcription of IGF-I mRNAs.

Biochemical and Biophysical Research Communications

Characterization of a rat insulin-like growth factor I gene promoter

Biochemical and Biophysical Research Communications

Characterization of a rat insulin-like growth factor I gene promoter.Lowe, William L.; Teasdale, Rebecca M.

Research output:Research – peer-review›Article

& Teasdale, RM 1992,, vol 189, no. 2, pp. 972-978. DOI:

Characterization of a rat insulin-like growth factor I gene promoter

Biochemical and Biophysical Research Communications

. 1992 Dec 15;189(2):972-978. Available from, DOI:

Characterization of a rat insulin-like growth factor I gene promoter

Biochemical and Biophysical Research Communications

. 1992 ; Vol. 189, No. 2. pp. 972-978

@article6e2ca21fe3b94e1baa201186ed699e06,

title = Characterization of a rat insulin-like growth factor I gene promoter,

abstract = Rat IGF-I mRNAs contain one of two alternative 5-untranslated regions which are encoded by alternative exons (exons 1 and 2) and whose expression is controlled by alternative promoter elements. We investigated the ability of fragments of DNA which contain exon 1 and its 5-flanking region to regulate transcription of a luciferase reporter gene in transient transfection assays. Maximal promoter activity was obtained with a construct which contained 412 bp of 5-flanking region while constructs which contained 1120 and 1690 bp of 5-flanking region induced 50% less enzymatic activity. Mapping of transcription start sites by RNase protection assay demonstrated that native start sites were used by these constructs, although the relative use of different start sites was different from start site usage by the endogenous gene. These data demonstrate that the 5-flanking region of exon 1 is capable of regulating transcription of IGF-I mRNAs.,

author = Lowe, William L. and Teasdale, Rebecca M.,

doi = 10.1016/0006-291X(92)92299-D,

journal = Biochemical and Biophysical Research Communications,

T1 – Characterization of a rat insulin-like growth factor I gene promoter

N2 – Rat IGF-I mRNAs contain one of two alternative 5-untranslated regions which are encoded by alternative exons (exons 1 and 2) and whose expression is controlled by alternative promoter elements. We investigated the ability of fragments of DNA which contain exon 1 and its 5-flanking region to regulate transcription of a luciferase reporter gene in transient transfection assays. Maximal promoter activity was obtained with a construct which contained 412 bp of 5-flanking region while constructs which contained 1120 and 1690 bp of 5-flanking region induced 50% less enzymatic activity. Mapping of transcription start sites by RNase protection assay demonstrated that native start sites were used by these constructs, although the relative use of different start sites was different from start site usage by the endogenous gene. These data demonstrate that the 5-flanking region of exon 1 is capable of regulating transcription of IGF-I mRNAs.

AB – Rat IGF-I mRNAs contain one of two alternative 5-untranslated regions which are encoded by alternative exons (exons 1 and 2) and whose expression is controlled by alternative promoter elements. We investigated the ability of fragments of DNA which contain exon 1 and its 5-flanking region to regulate transcription of a luciferase reporter gene in transient transfection assays. Maximal promoter activity was obtained with a construct which contained 412 bp of 5-flanking region while constructs which contained 1120 and 1690 bp of 5-flanking region induced 50% less enzymatic activity. Mapping of transcription start sites by RNase protection assay demonstrated that native start sites were used by these constructs, although the relative use of different start sites was different from start site usage by the endogenous gene. These data demonstrate that the 5-flanking region of exon 1 is capable of regulating transcription of IGF-I mRNAs.

JO – Biochemical and Biophysical Research Communications

T2 – Biochemical and Biophysical Research Communications

JF – Biochemical and Biophysical Research Communications

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