Dynein at the kinetochore: Timing, Interactions and Functions

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Kinetochores are crucial for mitotic chromosome alignment and spindle assembly checkpoint (SAC) regulation.
• Cytoplasmic dynein is implicated in microtubule (MT) dynamics and SAC signaling, but its precise roles are under investigation.

Purpose of the Study:

• To review recent findings on the function of cytoplasmic dynein in mitosis.
• To elucidate dynein's contribution to microtubule interactions and chromosome movement.
• To present new models for dynein's role in regulating anaphase onset and SAC silencing.

Main Methods:

• Literature review of recent studies on kinetochore-microtubule interactions and dynein function.
• Analysis of experimental data implicating dynein in chromosome alignment and SAC signaling.
• Development of conceptual models based on current understanding of dynein's molecular mechanisms.

Main Results:

• Cytoplasmic dynein is essential for initial microtubule capture and monitoring MT attachments at kinetochores.
• Dynein contributes to chromosome movement during prometaphase and anaphase, and tension generation at metaphase.
• Recent work highlights dynein's role in timely SAC silencing and promoting anaphase onset.

Conclusions:

• Cytoplasmic dynein is a multifaceted motor protein critical for accurate chromosome segregation during mitosis.
• Understanding dynein's regulation of kinetochore-MT interactions and SAC signaling is key to comprehending cell division fidelity.
• New models proposed herein offer a framework for future research into dynein's diverse mitotic functions.