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Related Experiment Videos

Retinoic acid receptor alpha1 variants, RARalpha1DeltaB and RARalpha1DeltaBC, define a new class of nuclear receptor

A Parrado1, G Despouy, R Kraïba

  • 1Laboratoire de Biologie Cellulaire Hématopoïétique, INSERM U00-03, Université D. Diderot-Paris VII, Institut d'Hématologie, Hôpital Saint-Louis, Paris, France. aparrado@ono.com

Nucleic Acids Research
|January 29, 2002
PubMed
Summary

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Researchers discovered a new variant of the retinoic acid receptor alpha 1 (RARalpha1) called RARalpha1DeltaBC. This variant lacks a DNA-binding domain but can still regulate gene transcription when partnered with retinoid X receptor alpha (RXRalpha).

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Retinoic acid (RA) signaling is crucial for gene transcription, mediated by retinoid X receptor (RXR) and retinoic acid receptor (RAR) heterodimers binding to retinoic acid response elements (RAREs).
  • RARalpha, a key receptor, exists in two isoforms (1 and 2) with distinct N-termini due to alternative splicing and promoter usage.

Purpose of the Study:

  • To identify and characterize novel splice variants of RARalpha1 in human B lymphocytes.
  • To investigate the functional properties of these variants, particularly their ability to interact with RXRalpha and regulate gene transcription.

Main Methods:

  • Isolation and sequencing of RARalpha1 splice variants from human B lymphocytes.
  • Functional assays to assess receptor binding, heterodimerization with RXRalpha, and transactivation of RAREs.

Related Experiment Videos

  • Use of specific RAR and RXR ligands to determine signaling pathways.

    • Main Results:

    • Two new RARalpha1 splice variants were identified: RARalpha1DeltaB (non-functional) and RARalpha1DeltaBC.
    • RARalpha1DeltaBC lacks the transactivation domain AF-1 and the DNA-binding domain but retains the ability to heterodimerize with RXRalpha.
    • The RXRalpha/RARalpha1DeltaBC heterodimer can transactivate the DR5 RARE, a function mediated by both RAR and RXR ligands, unlike the canonical RXRalpha/RARalpha1 heterodimer.
    • RARalpha1DeltaBC exhibits a heterogeneous tissue distribution with notable expression in myeloid cells.

    Conclusions:

    • RARalpha1DeltaBC represents a rare example of a functional nuclear receptor lacking a DNA-binding domain.
    • This variant plays a distinct role in RA signaling, particularly in myeloid cells, by forming a heterodimer with RXRalpha that responds to both RAR and RXR ligands.