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Related Concept Videos

Microtubule Associated Proteins (MAPs)01:42

Microtubule Associated Proteins (MAPs)

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Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
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Related Experiment Video

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Author Spotlight: Exploring Cell Migration and Gene Roles in the Developing Brain
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Author Spotlight: Exploring Cell Migration and Gene Roles in the Developing Brain

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FMRP regulates postnatal neuronal migration via MAP1B.

Salima Messaoudi1, Ada Allam1, Julie Stoufflet1,2

  • 1Sorbonne Université, CNRS UMR8246, Inserm U1130, Institut de Biologie Paris Seine (IBPS), Neuroscience Paris Seine (NPS), Paris, France.

Elife
|May 17, 2024
PubMed
Summary
This summary is machine-generated.

Fragile X syndrome (FXS) impairs neuronal migration due to FMRP absence. Restoring microtubule-associated protein 1B (MAP1B) function rescues these developmental defects.

Keywords:
FMRPMAP1Bcytoskeletonfragile X messenger ribonucleoproteinfragile X syndromemicrotubule-associated protein 1Bmouseneuronal migrationneuroscience

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Fragile X syndrome (FXS) is the leading inherited intellectual disability and a primary genetic cause of autism spectrum disorder.
  • FXS arises from the lack of the fragile X messenger ribonucleoprotein (FMRP).
  • The function of FMRP in neuronal migration, a critical brain development process, is not well understood.

Purpose of the Study:

  • To investigate the role of FMRP in neuronal migration during brain development.
  • To identify FMRP targets involved in regulating neuronal migration.
  • To elucidate the molecular mechanisms by which FMRP influences neuronal migration.

Main Methods:

  • Live imaging of postnatal rostral migratory stream (RMS) neurons in Fmr1-null mice.
  • RNA-interference-induced knockdown of Fmr1 and MAP1B.
  • Analysis of neuronal migration, centrosomal movement, and microtubule cytoskeleton structure.

Main Results:

  • Absence of FMRP causes delayed neuronal migration and altered trajectories in Fmr1-null mice.
  • These migratory defects are cell-autonomous and linked to centrosomal movement issues.
  • Microtubule-associated protein 1B (MAP1B) was identified as a key FMRP target, and its knockdown rescued migratory defects.
  • FMRP absence disrupts the microtubule cage around the nucleus, a defect rescued by MAP1B knockdown.

Conclusions:

  • FMRP plays a crucial role in orchestrating neuronal migration.
  • FMRP collaborates with MAP1B to regulate the microtubular cytoskeleton during neuronal migration.
  • These findings reveal a novel neurodevelopmental function for FMRP in brain development and FXS pathogenesis.