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A conserved structural element in horse and mouse IGF2 genes binds a methylation sensitive factor

K Otte1, D Choudhury, M Charalambous

  • 1Department of Pathology, Swedish University of Agricultural Sciences, PO Box 7028, 75007 Uppsala, Sweden. ko213@mole.biol.cam.ac.uk

Nucleic Acids Research
|May 30, 1998
PubMed
Summary

Researchers cloned and characterized the equine Insulin-like Growth Factor 2 (IGF2) gene, revealing unique promoter activity and a novel conserved structural element potentially involved in imprinting mechanisms.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Comparative Genomics

Background:

  • The Insulin-like Growth Factor 2 (IGF2) gene plays a crucial role in growth and development.
  • Understanding equine IGF2 gene structure and regulation is important for comparative studies.

Purpose of the Study:

  • To clone and characterize the equine IGF2 gene.
  • To investigate the transcriptional regulation and potential imprinting mechanisms of equine IGF2.

Main Methods:

  • Gene cloning and characterization.
  • RNase protection analysis to determine promoter activity.
  • In silico prediction of structural elements and in vitro structural analysis.

Main Results:

  • The equine IGF2 gene spans 9 kb, smaller than the human counterpart, with conserved exons.

Related Experiment Videos

  • Two promoters (P2, P3) are active in fetal tissues, while only P3 is active in adult tissues, differing from human/rodent patterns.
  • A novel, conserved inverted repeat in the 3' region forms a stem-loop structure, binds a methylation-sensitive protein, and may be involved in imprinting.

    • Conclusions:

    • The equine IGF2 gene has a unique transcriptional regulation pattern.
    • A conserved inverted repeat in the 3' region is a potential key element in IGF2 imprinting mechanisms.
    • A developmentally regulated, methylation-sensitive protein interacts with this novel structural element.