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Related Concept Videos

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Destabilization of Microtubules

The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
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Related Experiment Video

Updated: Jul 2, 2026

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
08:57

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Published on: July 30, 2014

Disruption of dynactin complex function in intellectual disability.

Yuxiang Pan1,2, Huijuan Li3, Mingchun Liao1,4

  • 1Guangdong Institute of Intelligence Science and Technology, Hengqin, Zhuhai 519031, China.

Proceedings of the National Academy of Sciences of the United States of America
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Intellectual disability (ID) is linked to harmful variants in DCTN4, a dynactin complex protein. This dysfunction disrupts neuronal development and synaptic function, revealing a new cause of ID.

Keywords:
JIP3dynactinintellectual disabilitylysosome transportneurodevelopment

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Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Intellectual disability (ID) affects millions globally, characterized by impaired cognition.
  • The dynactin complex is crucial for intracellular trafficking and neuronal homeostasis.
  • Previous research has not fully elucidated the genetic causes of ID related to dynactin function.

Purpose of the Study:

  • To investigate the role of dynactin subunit 4 (DCTN4) variants in intellectual disability.
  • To explore the impact of DCTN4 dysfunction on neuronal development and synaptic function.
  • To identify novel disease mechanisms underlying intellectual disability.

Main Methods:

  • Identification of deleterious DCTN4 variants in ID pedigrees.
  • Generation and analysis of DCTN4-deficient and variant mice models.
  • Assessment of neuronal positioning, progenitor cell apoptosis, cognitive function, and dendritic development.
  • Investigation of dynactin complex subunit levels and DCTN4-JIP3 complex disruption.
  • Analysis of DCTN2 variants in relation to neuronal positioning.

Main Results:

  • Deleterious DCTN4 variants were identified in individuals with ID.
  • DCTN4 ablation in mice led to abnormal neuronal positioning and neural progenitor cell death.
  • Mice with ID-linked DCTN4 variants exhibited cognitive deficits and impaired dendritic development.
  • DCTN4 deficiency reduced dynactin complex subunit levels, impacting synaptic function.
  • Disruption of the DCTN4-JIP3 complex impaired lysosomal transport and neuronal development.
  • Variants in DCTN2 also disrupted neuronal positioning, highlighting dynactin's role.

Conclusions:

  • Dysfunctional dynactin complex, particularly DCTN4 variants, represents a novel disease mechanism in intellectual disability.
  • DCTN4 is critical for proper neuronal positioning, progenitor cell survival, and synaptic development.
  • The dynactin complex plays a vital role in neurodevelopment and the pathogenesis of ID.