Single-particle tracking

Single-particle tracking (SPT) is the observation of the motion of individual particles within a medium. The coordinates time series, which can be either in two dimensions (x, y) or in three dimensions (x, y, z), is referred to as a trajectory. The trajectory is typically analyzed using statistical methods to extract information about the underlying dynamics of the particle.[1][2][3] These dynamics can reveal information about the type of transport being observed (e.g., thermal or active), the medium where the particle is moving, and interactions with other particles. In the case of random motion, trajectory analysis can be used to measure the diffusion coefficient.

Principle of single-particle tracking: The rectangles represent frames from an image acquisition at times t = 0, 1, 2, ... The tracked particles are represented as red circles, and in the last frame, the reconstructed trajectories are shown as blue lines

Applications

In life sciences, single-particle tracking is broadly used to quantify the dynamics of molecules/proteins in live cells (of bacteria, yeast, mammalian cells and live Drosophila embryos).[4][5][6][7] It has been extensively used to study the transcription factor dynamics in live cells.[8][9][10] Furthermore, exogenous particles are employed as probes to assess the mechanical properties of the medium, a technique known as passive microrheology.[11] This technique has been applied to investigate the motion of lipids and proteins within membranes,[12][13] molecules in the nucleus [14] and cytoplasm,[15] organelles and molecules therein,[16] lipid granules,[17][18][19] vesicles, and particles introduced in the cytoplasm or the nucleus. Additionally, single-particle tracking has been extensively used in the study of reconstituted lipid bilayers,[20] intermittent diffusion between 3D and either 2D (e.g., a membrane) [21] or 1D (e.g., a DNA polymer) phases, and synthetic entangled actin networks.[22][23]

Methods

The most common type of particles used in single particle tracking are based either on scatterers, such as polystyrene beads or gold nanoparticles that can be tracked using bright field illumination, or fluorescent particles. For fluorescent tags, there are many different options with their own advantages and disadvantages, including quantum dots, fluorescent proteins, organic fluorophores, and cyanine dyes.

On a fundamental level, once the images are obtained, single-particle tracking is a two step process. First the particles are detected and then the localized different particles are connected in order to obtain individual trajectories.

Besides performing particle tracking in 2D, there are several imaging modalities for 3D particle tracking, including multifocal plane microscopy,[24] double helix point spread function microscopy,[25] and introducing astigmatism via a cylindrical lens or adaptive optics.

Brownian diffusion
Main article: Brownian motion

See also

References
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