Characterization of the mouse insulin receptor gene promoter

E. Sibley, T. Kastelic, T. J. Kelly, M. D. Lane

Research output: Contribution to journalArticle

Abstract

The 5' flanking region of the mouse insulin proreceptor gene was isolated, and the 5' boundary of the minimal promoter was mapped. Genomic clones encompassing >30 kilobases of the gene contain the promoter and exons 1 and 2 interrupted by an ≃20-bilobase intron at the codon for amino acid 7 of the α subunit. The nucleotide sequence of a 1.3-kilobase fragment containing 766 base pairs of the 5' flanking region and the entire first exon was determined. Two major transcription start sites were mapped by S1 nuclease analysis to sites located 469 and 424 nucleotides upstream from the initiation codon for translation. The 5' terminus of an insulin proreceptor cDNA, isolated from a mouse 3T3-L1 adipocyte cDNA library, corresponds to the 3'-most major start site of transcription. The 5' deletion mutants of the 5' flanking region of the proreceptor gene, linked upstream of the bacterial chloramphenicol acetyltransferse reporter gene, were transfected into 3T3-L1 preadipocytes and assayed for promoter activity. The 5' boundary of the minimal promoter, which directs unexpectedly high levels of reporter gene expression, maps to a region 22 base pairs upstream from the 3'-most major transcription start site.

Original languageEnglish (US)
Pages (from-to)9732-9736
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume86
Issue number24
DOIs
StatePublished - Dec 1 1989

Keywords

  • 3T3-L1 cells
  • adipocyte
  • differentiation
  • preadipocyte

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Characterization of the mouse insulin receptor gene promoter'. Together they form a unique fingerprint.

  • Cite this