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Microtubule Formation01:23

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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Microtubules as a versatile reference standard for expansion microscopy.

Rajdeep Chowdhury1,2, Tiago Mimoso3, Abed Alrahman Chouaib4

  • 1Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Göttingen, Germany.

Communications Biology
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This summary is machine-generated.

Microtubules are proposed as ideal structures for validating expansion microscopy (ExM) techniques. This study details methods for using microtubules at various scales to assess ExM resolution and precision.

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Area of Science:

  • Biotechnology
  • Microscopy
  • Cell Biology

Background:

  • Expansion microscopy (ExM) is advancing, requiring standardized validation methods.
  • Current ExM validation structures lack consensus, hindering technique development.

Purpose of the Study:

  • To propose and validate microtubules as a universal standard for ExM validation.
  • To establish protocols for using microtubules across different ExM resolution scales.

Main Methods:

  • Immunostaining of cellular microtubules for validation of techniques with <50 nm resolution.
  • In vitro assembly and imaging of microtubules for validation of techniques with ~10 nm resolution.
  • Labeling tubulin peptide chains and analyzing single tubulin molecules for nanometer-scale techniques.

Main Results:

  • Microtubule diameter is suitable for validating ExM resolutions.
  • Protocols for in vitro microtubule assembly and cellular extraction are presented.
  • Multiple methods demonstrate microtubule utility for ExM validation.

Conclusions:

  • Microtubules offer a versatile and reliable structure for ExM validation.
  • The proposed methods support the standardization of ExM technology assessment.
  • Microtubules are valuable for validating ExM and related super-resolution imaging technologies.