TRα2—An Untuned Second Fiddle or Fine‐Tuning Thyroid Hormone Action?

Georg Sebastian Hönes*, Nina Härting, Jens Mittag, Frank J. Kaiser

*Corresponding author for this work
1 Citation (Scopus)


Thyroid hormones (THs) control a wide range of physiological functions essential for me-tabolism, growth, and differentiation. On a molecular level, TH action is exerted by nuclear receptors (TRs), which function as ligand‐dependent transcription factors. Among several TR isoforms, the function of TRα2 remains poorly understood as it is a splice variant of TRα with an altered C‐ terminus that is unable to bind T3. This review highlights the molecular characteristics of TRα2, proposed mechanisms that regulate alternative splicing and indications pointing towards an antag-onistic function of this TR isoform in vitro and in vivo. Moreover, remaining knowledge gaps and major challenges that complicate TRα2 characterization, as well as future strategies to fully uncover its physiological relevance, are discussed.

Original languageEnglish
Article number6998
JournalInternational Journal of Molecular Sciences
Issue number13
Publication statusPublished - 01.07.2022

Research Areas and Centers

  • Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)

DFG Research Classification Scheme

  • 205-17 Endocrinology, Diabetology, Metabolism


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