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ANKK1 Is a Wnt/PCP Scaffold Protein for Neural F-ACTIN Assembly.

Laura Domínguez-Berzosa1,2, Lara Cantarero1,2, María Rodríguez-Sanz1

  • 1Laboratory of Neurogenetics and Molecular Medicine, Center for Genomic Sciences in Medicine, Institut de Recerca Sant Joan de Déu, 08950 Barcelona, Spain.

International Journal of Molecular Sciences
|October 16, 2024
PubMed
Summary

The Ankyrin Repeat and Kinase Domain containing I (ANKK1) gene interacts with synaptic proteins to influence neural development and F-ACTIN assembly. This research suggests a brain structural basis for ANKK1 TaqIA polymorphism-associated phenotypes.

Keywords:
ANKK1F-ACTINFARP1TaqIAWnt/PCPaddictions

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • The TaqIA polymorphism is linked to ANKK1 (RIP-kinase) and DRD2 (dopamine receptor D2).
  • ANKK1 function is poorly understood, hindering interpretation of TaqIA's role in psychiatric disorders.
  • SH-SY5Y neuroblastoma models are utilized to investigate ANKK1's cellular mechanisms.

Purpose of the Study:

  • To elucidate the molecular function of ANKK1 in neuronal development.
  • To investigate ANKK1's interaction with synaptic proteins and pathways.
  • To explore the structural basis of TaqIA polymorphism-associated phenotypes.

Main Methods:

  • Investigated ANKK1 interactions with FARP1 (a RhoGEF) in SH-SY5Y neuroblastoma cells.
  • Analyzed protein colocalization in F-ACTIN-rich structures.
  • Examined the impact of ANKK1 and FARP1 knockdown on RhoGTPases and neural differentiation.
  • Studied ANKK1's interaction with WGEF (another Wnt/PCP GEF).

Main Results:

  • ANKK1 interacts with FARP1, a GEF for RAC1 and RhoA, and they colocalize in F-ACTIN structures.
  • Both ANKK1 and FARP1 activate the Wnt/PCP pathway; ANKK1 promotes neuritogenesis and spine outgrowth.
  • Knockdown of ANKK1 or FARP1 affects RhoGTPase expression and neural differentiation.
  • ANKK1 regulates WGEF interaction with RhoA, with altered interactions during neuronal differentiation.

Conclusions:

  • ANKK1 plays a crucial role in neuronal maturation, migration, and spine outgrowth via F-ACTIN assembly.
  • ANKK1 interacts with FARP1 and WGEF to bidirectionally control F-ACTIN dynamics.
  • These findings provide a potential brain structural explanation for phenotypes associated with the ANKK1 TaqIA polymorphism.