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Multiple components of a complex androgen-dependent enhancer.

A J Adler1, A Scheller, Y Hoffman

  • 1Department of Human Genetics, University of Michigan Medical School, Ann Arbor 48109-0618.

Molecular Endocrinology (Baltimore, Md.)
|November 1, 1991
PubMed
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The sex-limited protein (Slp) gene enhancer in male mice requires a hormone response element (HRE) and accessory sequences for androgen regulation. Cooperative interactions between these elements ensure precise hormonal control of gene expression.

Area of Science:

  • Molecular Endocrinology
  • Gene Regulation
  • Steroid Hormone Action

Background:

  • The sex-limited protein (Slp) gene is specifically expressed in adult male mice.
  • Understanding the regulatory mechanisms of Slp gene expression is crucial for deciphering male-specific biological processes.

Purpose of the Study:

  • To identify and characterize the regulatory elements responsible for androgen-dependent enhancer activity of the Slp gene.
  • To elucidate the molecular interactions that mediate the response to androgens.

Main Methods:

  • Transient transfection assays were used to assess enhancer activity.
  • Chloramphenicol acetyltransferase (CAT) reporter gene expression was measured.
  • In vitro binding assays were performed to study protein-DNA interactions.

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Main Results:

  • A 160-basepair fragment upstream of the Slp gene acts as an androgen-dependent enhancer.
  • A consensus hormone response element (HRE) is necessary but not sufficient for induction.
  • Cooperative interactions between the HRE and an accessory sequence significantly augment androgen response.
  • Additional elements, including degenerate HREs, modulate enhancer activity in a cell-specific manner.

Conclusions:

  • The Slp gene enhancer exhibits complex regulation involving multiple interacting elements.
  • Cooperative binding and cell-specific factors contribute to precise androgen responsiveness.
  • This intricate regulatory mechanism ensures specificity and fine-tuning of gene expression in response to hormone levels.