Centrioles without microtubules: a new morphological type of centriole

Biology Open
Rustem E UzbekovChristophe Bressac

Abstract

The centrosome is the organizing center of microtubules in the cell, the basis for the origin of cilia and flagella and a site for the concentration of a regulatory proteins multitude. The centrosome comprises two centrioles surrounded by pericentriolar material. Centrioles in the cells of different organisms can contain nine triplets, doublets or singlets of microtubules. Here, we show that in somatic cells of male wasp larvae Anisopteromalus calandrae, centrioles do not contain microtubules and are composed of nine electron-dense prongs, which together form a cogwheel structure. These microtubule-free centrioles can be the platform for procentriole formation and form microtubule-free cilia-like structures. In nymph and imago cells centrioles have a microtubule triplet structure. Our study describes how centriole structure differs in a development-stage-dependent and a cell-type-dependent manner. The discovery of a centriole without microtubules casts a new light on the centriole formation process and the evolution of this organelle.

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Citations

Sep 22, 2020·The EMBO Journal·Sergey NazarovPierre Gönczy
May 28, 2020·Cells·Alain DebecTimothy L Megraw
Sep 30, 2020·Cells·Rustem E Uzbekov, Tomer Avidor-Reiss
Feb 8, 2019·Journal of Nanobiotechnology·Anastasiia GaraninaRustem Uzbekov
Jan 19, 2021·Seminars in Cell & Developmental Biology·Swadhin Chandra Jana

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electron microscopy

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