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Subcellular Fractionation

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The homogenate obtained after cell lysis contains various membrane-bound organelles that can be further separated into pure fractions by subcellular fractionation. These isolates are used to study specific cellular components, analyze localized protein activity, and are even employed in diagnostics. Fractionation is typically achieved using centrifugation methods, the most common being density-gradient and differential centrifugation.
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The real number system cannot represent the square root of a negative number, which restricts solutions for certain equations, such as quadratics with negative discriminants. To address this, the complex number system was developed, introducing the imaginary unit i, where i = √(-1). This extension allows for the representation of all roots, including those involving negative radicands.A complex number is written in the form x + yi, where x and y are real numbers. Here, x represents the...
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Related Experiment Video

Updated: Jan 29, 2026

Modulation of Tau Subcellular Localization as a Tool to Investigate the Expression of Disease-related Genes
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The CNTNAP2-CASK complex modulates GluA1 subcellular distribution in interneurons.

Ruoqi Gao1, Colleen R Zaccard1, Lauren P Shapiro1

  • 1Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, 60611 IL, USA.

Neuroscience Letters
|February 20, 2019
PubMed
Summary
This summary is machine-generated.

Contactin-associated protein-like 2 (CNTNAP2) and calcium/calmodulin-dependent serine protein kinase (CASK) interact with GluA1 in interneurons. Disrupting either CNTNAP2 or CASK affects GluA1 levels and localization, offering insights into neurodevelopmental disorders.

Keywords:
AMPA receptorsAutism spectrum disordersCntnap2DendritesExcitatory-inhibitory balanceLanguage disordersMechanismNeuropsychiatric disordersSchizophreniaStructured illumination microscopy

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Homochronic Transplantation of Interneuron Precursors into Early Postnatal Mouse Brains
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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • GABAergic interneurons are implicated in neurodevelopmental disorders like autism and epilepsy.
  • Dysregulation of 2-amino-3-(3-hydroxy-5-methyl-isoxazol-4-yl) propanoic acid receptors (AMPARs) in interneurons is underexplored.
  • Contactin-associated protein-like 2 (CNTNAP2) and calcium/calmodulin-dependent serine protein kinase (CASK) are linked to neurodevelopmental disorders and glutamate receptor trafficking.

Purpose of the Study:

  • To investigate the interaction between CNTNAP2, CASK, and AMPAR subunit GluA1 in mature interneurons.
  • To elucidate the role of CNTNAP2 and CASK in regulating GluA1 localization and levels within interneurons.

Main Methods:

  • Biochemical techniques to confirm protein interactions in mouse brain.
  • Structured illumination microscopy (SIM) to visualize tripartite colocalization of CNTNAP2, CASK, and GluA1.
  • shRNA technology to assess the impact of CNTNAP2 and CASK knockdown on GluA1.

Main Results:

  • CNTNAP2, CASK, and GluA1 were confirmed to interact and colocalize in a tripartite manner in mature interneurons.
  • Knockdown of either CNTNAP2 or CASK led to similar alterations in GluA1 levels and localization.
  • These findings suggest a coordinated role for CNTNAP2 and CASK in regulating GluA1 in interneurons.

Conclusions:

  • CNTNAP2 and CASK play a crucial role in regulating GluA1 in interneurons.
  • The findings provide molecular insights into the pathophysiology of neurodevelopmental disorders linked to interneuron dysfunction.
  • This study highlights a potential therapeutic target for conditions involving excitatory/inhibitory imbalance.