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IL1RAPL1 knockout mice show spine density decrease, learning deficiency, hyperactivity and reduced anxiety-like

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The IL-1 receptor accessory protein-like 1 (IL1RAPL1) gene impacts intellectual disability and autism. Its absence reduces neuron spine density, affecting memory, behavior, and anxiety levels in mice.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • IL-1 receptor accessory protein-like 1 (IL1RAPL1) is linked to nonsyndromic intellectual disability and autism spectrum disorder.
  • IL1RAPL1 plays a role in excitatory synapse formation via interaction with PTPδ.

Purpose of the Study:

  • To investigate the functional consequences of IL1RAPL1 deficiency on neuronal structure and behavior.
  • To elucidate the role of IL1RAPL1 in learning, memory, behavioral flexibility, and anxiety-related behaviors.

Main Methods:

  • Generation and behavioral analysis of IL1RAPL1 knockout mice.
  • Assessment of cortical neuron spine density.
  • Evaluation of spatial learning, working memory, remote fear memory, and behavioral flexibility using T-maze and rotarod tests.
  • Measurement of locomotor activity and anxiety-like behaviors in open-field and elevated plus maze tests.

Main Results:

  • IL1RAPL1 knockout mice exhibited significantly reduced cortical neuron spine density.
  • Mild impairments in spatial reference and working memories, and remote fear memory were observed.
  • Behavioral flexibility was slightly reduced, while performance on the rotarod test was enhanced.
  • Knockout mice showed consistently high locomotor activity and decreased anxiety-like behaviors.

Conclusions:

  • IL1RAPL1 deficiency leads to decreased spine density and impacts multiple cognitive and behavioral domains.
  • The study highlights IL1RAPL1's crucial role in synaptic plasticity, learning, memory, and behavioral regulation.
  • Findings provide insights into the neurobiological underpinnings of intellectual disability and autism associated with IL1RAPL1.