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Two novel RXR alpha isoforms from mouse testis

J Brocard1, P Kastner, P Chambon

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Collège de France, Illkirch, C.U. de Strasbourg, France.

Biochemical and Biophysical Research Communications
|December 4, 1996
PubMed
Summary
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Researchers discovered two new Retinoid X Receptor alpha (RXR alpha) variants, mRXR alpha 2 and mRXR alpha 3, in mouse testes. These variants suggest a specialized role for RXR alpha in sperm development.

Area of Science:

  • Molecular Biology
  • Reproductive Biology
  • Genetics

Background:

  • Retinoid X Receptor alpha (RXR alpha) is a key nuclear receptor involved in various biological processes.
  • Understanding RXR alpha isoforms is crucial for elucidating its diverse functions.

Purpose of the Study:

  • To identify and characterize novel RXR alpha isoforms in mouse testis.
  • To investigate the potential role of these isoforms in spermatogenesis.

Main Methods:

  • Isolation of mouse testis cDNA.
  • Sequence analysis to identify novel isoforms.
  • Expression analysis to determine tissue-specific and developmental regulation.

Main Results:

  • Two novel RXR alpha isoforms, mRXR alpha 2 and mRXR alpha 3, were isolated from mouse testis cDNA.

Related Experiment Videos

  • These isoforms encode a protein lacking 28 N-terminal amino acids compared to the major RXR alpha 1 isoform, with an altered N-terminal activation function (AF-1).
  • mRXR alpha 2 and mRXR alpha 3 are specifically expressed in the testis and significantly upregulated at puberty.

    • Conclusions:

    • The discovery of mRXR alpha 2 and mRXR alpha 3 adds to the molecular complexity of RXRs.
    • RXR alpha likely plays a specific and critical role during spermatogenesis, particularly in the transition to puberty.