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RNF216 affects the stability of STAU2 in the hypothalamus.

Han Yang1,2,3,4, Yong Zhu5, Xin Li2,3,4

  • 1Department of Clinical Laboratory, The Affiliated Zhuzhou Hospital Xiangya Medical College, Central South University, Zhuzhou, China.

Development, Growth & Differentiation
|July 13, 2023
PubMed
Summary

Ring finger protein 216 (RNF216) deficiency increases Staufen2 (STAU2) levels, impacting GnRH signaling and gonadal development in idiopathic hypogonadotropic hypogonadism (IHH). STAU2 may be a therapeutic target for IHH.

Keywords:
GnRH signal pathwayRNF216STAU2protein stability

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Genetics

Background:

  • Idiopathic hypogonadotropic hypogonadism (IHH) is a rare disorder of gonadal failure due to gonadotropin-releasing hormone (GnRH) deficiency.
  • RNF216 variants are implicated in IHH, but the underlying molecular mechanisms remain unclear.

Purpose of the Study:

  • To investigate the role of Ring finger protein 216 (RNF216) in the pathogenesis of IHH.
  • To elucidate the interaction between RNF216 and Staufen2 (STAU2) in the context of GnRH regulation.

Main Methods:

  • Investigated RNF216-STAU2 interaction and STAU2 stability via the ubiquitin-proteasome pathway.
  • Analyzed STAU2 and RNA levels in the hypothalamus of RNF216 knockout (RNF216-/-) and wild-type (WT) mice using Western blotting and RNA sequencing.
  • Assessed signaling pathway activities including GnRH signaling and ovarian steroidogenesis.

Main Results:

  • RNF216 interacts with STAU2 and regulates its stability through ubiquitination.
  • STAU2 levels are elevated in the hypothalamus of RNF216-/- mice compared to WT mice.
  • Deletion of RNF216 downregulates prolactin signaling, neuroactive ligand-receptor interaction, GnRH signaling, and ovarian steroidogenesis.

Conclusions:

  • RNF216 deficiency disrupts STAU2 homeostasis, leading to impaired GnRH secretion and gonadal development.
  • STAU2 emerges as a potential therapeutic target for treating IHH.
  • Further research is required to confirm the link between STAU2 and the observed signaling pathway dysregulation in IHH.