Cell cycle regulation and RNA polymerase II.

Area of Science:

• Molecular Biology
• Cell Biology
• Neuroscience

Background:

• Cell cycle progression and RNA polymerase II (RNAP II) transcription share common molecular machinery.
• RNAP II activity is dynamically regulated throughout the cell cycle, influencing gene expression.
• Phosphorylation of the RNAP II largest subunit's carboxyl-terminal domain (CTD) is a key regulatory mechanism.

Purpose of the Study:

• To explore the intricate relationship between cell cycle regulation and RNAP II transcription.
• To identify key kinases involved in cell cycle-dependent CTD phosphorylation.
• To understand the role of these regulatory events in DNA damage response and neurodegenerative diseases like Alzheimer's.

Main Methods:

• Review and synthesis of existing literature on RNAP II, cell cycle kinases, and CTD phosphorylation.
• Analysis of the involvement of cyclin-dependent kinases (cdks) such as cdk1, cdk7, cdk8, and cdk9.
• Examination of other implicated kinases including casein kinase II (CKII) and c-abl.

Main Results:

• Multiple cdks and other kinases directly modulate RNAP II CTD phosphorylation in a cell cycle-dependent manner.
• RNAP II stalling at DNA lesions contributes to p53 accumulation and DNA damage response pathways.
• Aberrant activation of mitotic cdks in postmitotic neurons, leading to RNAP II-LS phosphorylation, is implicated in Alzheimer's disease pathology.

Conclusions:

• Cell cycle control is integral to RNAP II transcriptional regulation via CTD modifications.
• Dysregulation of these pathways has significant implications for cellular responses to DNA damage and neurological disorders.
• Targeting cell cycle-related kinases may offer therapeutic avenues for diseases involving transcriptional dysregulation.