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Dax-1 and steroid receptor RNA activator (SRA) function as transcriptional coactivators for steroidogenic factor 1 in

Bin Xu1, Wei-Hsiung Yang, Isabelle Gerin

  • 1Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan Medical School, Ann Arbor, Michigan 48109-5678, USA. bxu@umich.edu

Molecular and Cellular Biology
|February 4, 2009
PubMed

Insights

Steroidogenic factor 1 (SF-1) and Dax-1 act as coactivators in adrenal development and steroidogenesis. Dax-1

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Steroidogenic factor 1 (SF-1) is crucial for adrenal development and steroidogenesis.
  • Dax-1 typically represses SF-1 target genes, but its loss-of-function mutations paradoxically cause adrenal hypoplasia, suggesting a complex role.

Purpose of the Study:

  • To investigate the paradoxical role of Dax-1 in SF-1-mediated gene regulation.
  • To elucidate the coactivator functions of Dax-1 and steroid receptor RNA activator (SRA) in steroidogenesis.

Main Methods:

  • Investigated Dax-1's function as an SF-1 coactivator.
  • Examined the interaction of SF-1 and Dax-1 with the RNA coactivator SRA and the coactivator TIF2.
  • Utilized knockdown experiments for SRA and Dax-1 in adrenal and Leydig cells to assess effects on gene expression.

Main Results:

  • Dax-1 functions as a dosage-dependent SF-1 coactivator.
  • Both SF-1 and Dax-1 bind to the RNA coactivator SRA; TIF2 synergistically coactivates SF-1 with Dax-1.
  • SRA knockdown abolishes Dax-1 coactivation, reducing steroidogenic gene expression (StAR, MC2R). Dax-1 knockdown downregulates CYP11A1 and StAR.

Conclusions:

  • Reveals novel coactivator functions for SRA and Dax-1 in regulating steroidogenesis.
  • Highlights the complex, context-dependent roles of Dax-1 in adrenal and steroidogenic biology.

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