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#MTOC

2 public questions tagged with this topic.

Cytoskeleton

Which cellular structure serves as the microtubule-organizing center (MTOC) for cilia and flagella?

Basal bodies serve as dedicated microtubule-organizing centers for ciliary and flagellar assembly, derived from centrioles through maturation and membrane docking. Each barrel consists of nine triplet microtubules with distal and subdistal appendages that anchor to the plasma membrane and recruit intraflagellar transport proteins. They template the nine doublet microtubules of the axoneme via transition zone proteins that establish ciliary gate function, ensuring selective entry of tubulin and dynein arms. Unlike the pericentriolar centrosome that nucleates interphase radial arrays and mitotic

Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Ch 17; basal body templates cilia/flagella as MTOC.

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Cytoskeleton

Which structure serves as the nucleation site for microtubule polymerization in animal cells?

Cytoplasmic microtubule arrays need defined origin to orient trafficking and establish cell polarity and division symmetry. In animal cells primary microtubule organizing center is centrosome positioned near nucleus serving as focal nucleation point and signaling hub. Ultrastructurally centrosome comprises pair of cylindrical centrioles surrounded by amorphous pericentriolar material enriched in coiled coil proteins pericentrin Cep192 and gamma tubulin ring complexes gamma TuRC. Centrioles provide 9 fold symmetry scaffold stabilized by polyglutamylated triplets while PCM concentrates nucleatio

Ref: Doxsey, Nat Rev Mol Cell Biol 2001: Centrosome as nucleation site for microtubule polymerization organization.

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