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Related Concept Videos

Centrosome Duplication02:25

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Centrosome Duplication02:25

Centrosome Duplication

The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...

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Forebrain Eml1 depletion reveals early centrosomal dysfunction causing subcortical heterotopia.

Donia Zaidi1,2,3, Kaviya Chinnappa1,2,3, Berfu Nur Yigit4

  • 1Institut du Fer à Moulin , Paris, France.

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|September 24, 2024
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Mutations in EML1 cause subcortical heterotopia by disrupting microtubule regulation in radial glia. Restoring microtubule function corrects cell positioning and reduces malformations, clarifying a key developmental mechanism.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Subcortical heterotopia is a brain malformation linked to epilepsy and intellectual disability.
  • Mutations in Echinoderm microtubule-associated protein like 1 (EML1) are known causes of subcortical heterotopia.
  • Abnormal radial glia positioning precedes heterotopia formation, but the mechanisms are unclear.

Purpose of the Study:

  • To investigate the early cellular mechanisms underlying EML1 mutation-induced subcortical heterotopia.
  • To elucidate the role of EML1 in radial glia positioning and cortical development.

Main Methods:

  • Utilized a forebrain conditional Eml1 mutant mouse model.
  • Examined primary cilia, centrosomes, microtubule dynamics, and cell cycle kinetics in radial glia.
  • Assessed the impact of rescuing microtubule formation in mutant embryonic brains.

Main Results:

  • EML1 mutations altered primary cilia and centrosomes in radial glia.
  • Abnormal microtubule dynamics and cell cycle kinetics were observed in mutant radial glia.
  • Restoring microtubule formation significantly reduced radial glia delamination and heterotopia volume.

Conclusions:

  • EML1 is crucial for microtubule regulation, which is essential for proper radial glia positioning.
  • This study establishes a causal link between EML1 function, microtubule dynamics, and cell positioning in cortical development.
  • The findings provide a new model for understanding subcortical heterotopia pathogenesis.