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Expression, Subcellular Localization, and Mechanistic Analysis of Intellectual Disability Syndrome Protein ABBA.

Aqsa Jabeen1,2, Pushpa Khanal1,2,3, Emilia Toissalo1,2

  • 1Minerva Foundation Institute for Medical Research, Helsinki, Finland.

Molecular Neurobiology
|December 8, 2025
PubMed
Summary
This summary is machine-generated.

A mutation in the MTSS2 gene affects ABBA protein, crucial for brain development. ABBA is vital in inhibitory neurons, promoting dendritic spine formation and potentially impacting intellectual disability syndromes.

Keywords:
ABBA/MTSS2Arp2/3 complexDendritic spinesI-BAR domain proteinInhibitory neuronsRAC1

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Missense mutations in the MTSS2 gene are linked to intellectual disability syndromes.
  • The MTSS2 gene encodes the I-BAR domain protein ABBA (also known as Mtss1l/Mtss2).
  • Understanding ABBA's cellular role is key to elucidating MTSS2 mutation effects in the brain.

Purpose of the Study:

  • To investigate the cellular expression and subcellular localization of the ABBA protein in the brain.
  • To gain insights into cellular processes potentially affected in patients with MTSS2 mutations.
  • To explore ABBA's role in neurodevelopmental processes, particularly spinogenesis.

Main Methods:

  • Immunohistochemistry to determine ABBA expression in specific neuronal populations.
  • Live-cell imaging to observe ABBA dynamics during membrane protrusion formation.
  • Overexpression studies in neurons to assess ABBA's impact on dendritic spine density.

Main Results:

  • ABBA is highly expressed in GABAergic inhibitory neurons, including hippocampal parvalbumin-positive interneurons.
  • Subcellularly, ABBA localizes to the edges of membrane protrusions, suggesting roles in cell migration and spinogenesis.
  • ABBA overexpression enhances dendritic spine density, and live imaging shows it facilitates spine initiation by clustering on the plasma membrane.

Conclusions:

  • ABBA plays a significant role in facilitating membrane protrusion formation, including dendritic filopodia and lamellipodia.
  • ABBA's function in inhibitory neurons and spine formation provides insights into neurodevelopmental disorders associated with MTSS2 mutations.
  • ABBA acts as a more general facilitator of protrusion formation compared to its homolog MIM.