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Differential gene regulation by the SRC family of coactivators

Hua Zhang1, Xia Yi, Xiaojing Sun

  • 1Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100083, China.

Genes & Development
|July 17, 2004
PubMed

Insights

Steroid receptor coactivators (SRCs) exhibit distinct recruitment patterns on gene promoters, influencing temporal gene transcription. This differential recruitment may contribute to breast cancer development.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Cancer Biology

Background:

  • Steroid receptor coactivators (SRCs) are crucial for nuclear receptor-mediated transcription.
  • While SRC knockout mice show varied phenotypes, molecular evidence for functional specificity among SRC family members (SRC-1, GRIP1, AIB1) is lacking.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying functional specificity of SRC coactivators.
  • To elucidate the differential recruitment of SRCs to gene promoters and their role in temporal gene regulation.
  • To explore the potential involvement of AIB1 in breast cancer carcinogenesis.

Main Methods:

  • Investigated SRC coactivator recruitment to hormone-responsive elements (HREs) and non-HREs.
  • Analyzed SRC recruitment as monomers or heterodimers (AIB1:GRIP1, AIB1:SRC-1).
  • Correlated AIB1 and c-myc overexpression in ER+ breast carcinoma samples.

Main Results:

  • SRC coactivators (AIB1:GRIP1 or AIB1:SRC-1) are recruited via heterodimerization to HRE-containing promoters.
  • GRIP1 or SRC-1 is recruited as a monomer to non-HRE promoters, dependent on cellular protein abundance.
  • SRC proteins contribute to the temporal regulation of gene transcription, with non-HRE genes activated earlier than HRE genes.
  • A positive correlation between AIB1/c-myc overexpression was observed in ER+ breast carcinoma.

Conclusions:

  • SRC coactivators display distinct recruitment mechanisms (monomeric vs. heterodimeric) based on promoter type (HRE vs. non-HRE).
  • SRC coactivators play a significant role in the temporal control of gene transcription.
  • AIB1 overexpression, potentially in conjunction with c-myc, may contribute to breast cancer development.

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