An estrogen receptor alpha activity indicator model in mice

Genesis. 2009 Dec;47(12):815-24. doi: 10.1002/dvg.20572.


Estrogen receptor alpha (ERalpha), plays essential roles in the female reproduction. To investigate the dynamic changes in ERalpha activity in vivo, we have developed an ER Alpha Activity Indicator (ERAAI) mouse. This ERAAI mouse harbors both a modified ERalpha Bacterial Artificial Chromosome (BAC) clone and a reporter gene which is regulated specifically by the modified receptor. The ERalpha modification (Gal4-ERalpha) consists replacing the DNA binding domain (DBD) of ERalpha with the DBD of yeast Gal4 transcription factor. This reporter transgene consisting of a humanized renilla Green Fluorescent Protein (hrGFP) sequence controlled by the Upstream Activating Sequences for the Gal4 gene (UAS(G)) was inserted into the modified ERalpha BAC clone. Expression of Gal4-ERalpha and hrGFP reliably recapitulates endogenous ERalpha expression and activity in the estrogen target tissues in response to estrogen stimulation. Therefore, the ERAAI mouse represents a novel animal model to investigate dynamic ERalpha activity in vivo.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Binding Sites / genetics
  • Biomarkers / analysis*
  • Blotting, Northern
  • Blotting, Western
  • Chromosomes, Artificial, Bacterial / genetics
  • DNA-Binding Proteins / genetics
  • DNA-Binding Proteins / metabolism
  • Estrogen Receptor alpha / genetics*
  • Estrogen Receptor alpha / metabolism
  • Estrogens / pharmacology
  • Female
  • Gene Expression / drug effects
  • Gene Expression Profiling
  • Green Fluorescent Proteins / genetics
  • Green Fluorescent Proteins / metabolism
  • Humans
  • Immunohistochemistry
  • Male
  • Mice
  • Mice, Transgenic
  • Models, Animal*
  • Ovariectomy
  • Recombinant Fusion Proteins / genetics
  • Recombinant Fusion Proteins / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism
  • Transcription Factors / genetics
  • Transcription Factors / metabolism


  • Biomarkers
  • DNA-Binding Proteins
  • Estrogen Receptor alpha
  • Estrogens
  • GAL4 protein, S cerevisiae
  • Recombinant Fusion Proteins
  • Saccharomyces cerevisiae Proteins
  • Transcription Factors
  • Green Fluorescent Proteins