Microtubule Polarity
Microtubule Polarity - Related Videos
12:20
Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
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Cited by 24 •
2014
Microtubules are inherently unstable polymers, and their switching between growth and shortening is stochastic and difficult to control. Here we describe protocols using segmented microtubules with photoablatable stabilizing caps. Depolymerization of segmented microtubules can be triggered with high temporal and spatial resolution, thereby assisting analysis of motions with the disassembling microtubule ends.
01:01
Group Polarization
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2020
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition. The phenomenon of group polarization explains many actions taken by groups that would not...
12:38
Use of Immunolabeling to Analyze Stable, Dynamic, and Nascent Microtubules in the Zebrafish Embryo
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Cited by 1 •
2017
Immunolabeling methods to analyze distinct populations of microtubules in the developing zebrafish brain are described here, which are broadly applicable to other tissues. The first protocol outlines an optimized method for immunolabeling stable and dynamic microtubules. The second protocol provides a method to image and quantify nascent microtubules specifically.
03:37
Molecular Shape and Polarity
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2020
Dipole Moment of a Molecule Polar covalent bonds connect two atoms with differing electronegativities, leaving one atom with a partial positive charge (δ+) and the other atom with a partial negative charge (δ–), as the electrons are pulled toward the more electronegative atom. This separation of charge gives rise to a bond dipole moment. The magnitude of a bond dipole moment is represented by the Greek letter mu (µ) and is given by the formula shown here, where Q is the magnitude of the...
01:35
Microtubules
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2026
There are three types of cytoskeletal structures in eukaryotic cells—microfilaments, intermediate filaments, and microtubules. With a diameter of about 25 nm, microtubules are the thickest of these fibers. Microtubules carry out a variety of functions that include cell structure and support, transport of organelles, cell motility (movement), and the separation of chromosomes during cell division.Microtubules are hollow tubes whose walls are made up of globular tubulin proteins. Each tubulin...
FAQs
Preferential tubulin addition and dissociation at the plus end gives microtubules dynamic instability, meaning their lengths can change through alternating growth and loss. Because these changes occur within a polarized polymer, they influence how the cytoskeleton reorganizes and how intracellular transport pathways are maintained or remodeled during cell organization.
Kinesin and dynein move cargo according to the orientation of microtubules, allowing polarity to determine the direction of vesicle and organelle movement. Their activity links the structural arrangement of the cytoskeleton to cargo distribution, so altered orientation can affect where materials and organelles are positioned inside a cell.
During cell division, microtubule polarity provides an organized framework associated with chromosome segregation. The directional arrangement of the polymers helps connect cytoskeletal organization with the movement and positioning required to distribute chromosomes. Studying this relationship clarifies how errors in cellular architecture may interfere with accurate division.
Polarity describes the structural directionality created by distinct plus and minus ends, whereas dynamic instability describes changes in microtubule length caused by tubulin addition and dissociation. They are related but not interchangeable: polarity establishes directional organization, while dynamic instability allows that organized system to change over time.
Investigations can connect microtubule orientation with vesicle movement, organelle positioning, chromosome segregation, and the function of cilia or flagella. These outcomes provide different readouts of cytoskeletal organization, allowing researchers to assess how directional microtubule arrangements shape transport, division, and specialized cellular structures.
Microtubule polarity helps organize the intracellular architecture that supports cell shape and migration. Its influence on transport and organelle positioning connects the cytoskeleton with broader changes in cell organization. In biology research, this makes polarity relevant for explaining how cells establish and maintain spatial structure while moving.
Neuronal development depends on organized cell architecture, and microtubule polarity contributes by guiding intracellular transport and supporting cell organization. Examining this relationship helps researchers connect cytoskeletal directionality with neuronal structure and development, while also providing context for studying developmental disorders associated with disrupted cellular organization.
Microtubule polarity is relevant to cancer research because it connects cytoskeletal organization with chromosome segregation, cell division, and intracellular transport. Drugs that disrupt microtubule dynamics can therefore be studied in relation to these processes. Polarity provides an organizing framework for interpreting how altered microtubule behavior affects cellular outcomes.