G1-S regulators: key players in cell cycle control

G1-S regulators are essential components in the cell cycle, governing the critical checkpoint that regulates the progression from the G1 phase (Gap 1) to the S phase (Synthesis). This transition is crucial for cell growth and division, and its regulation is vital for maintaining cellular homeostasis and preventing uncontrolled cell proliferation, which can lead to cancer.

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Key players in G1-S transition

Cyclins: regulate the cell cycle by activating cyclin-dependent kinases (CDKs) such as CDK2, CDK4/6.
Cyclin-Dependent Kinases (CDKs): are enzymes that, when activated by cyclins, phosphorylate target proteins to promote cell cycle progression.
Retinoblastoma Proteins (Rb): acts as a critical tumor suppressor and is a key regulator of the G1-S transition.
E2F Transcription Factors: play a pivotal role in driving the expression of genes required for DNA synthesis.
CDKs Inhibitors: CKIs, such as p21 and p16, play an essential role in negatively regulating the cell cycle.
Anaphase Promoting Complex/Cyclosome (APC/C): particularly its co-activator CDH1, plays a role in maintaining cell cycle checkpoints by degrading cyclins and ensuring that cells do not prematurely enter S phase.

Mechanisms of regulation

The G1-S transition is characterized by intricate feedback loops involving CDKs, Rb, and E2Fs. For example:

The hyperphosphorylation of Rb leads to its inactivation, promoting E2F activity.
E2Fs can up regulate their own regulators while simultaneously down regulating inhibitors like p21, creating a positive feedback loop that reinforces progression into S phase.

The importance of G1-S regulators in cancer

Dysregulation of G1-S pathway can lead to various cancer. For instance, overexpression of cyclins or mutation in CDK genes can result in uncontrolled cell division. Understanding these regulatory mechanisms is crucial for developing targeted therapies in cancer treatment.

Interactions between G1-S regulators and pathways

G1-S components interact with several key signaling pathways that are crucial for cell cycle control and cancer biology:

p53 pathway
PI3K/AKT pathway
Rb pathway
Wnt pathway
Notch pathway

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G1-S regulators biomarker list

You can check the biomarker list included in this pathway, see below:

Species : Homo sapiens (human)

Human signaling pathway

Signaling Pathways	Product ref	Informations
G1-S Regulators	G1S1H1	Download biomarker list
G1-S Regulators	G1S2H1	Download biomarker list

Species : Mus musculus (mouse)

Mouse signaling pathway

Signaling Pathways	Product ref	Informations
G1-S Regulators	*******	Biomarker list in progress.

Species : Rattus norvegicus (rat)

Rat signaling pathway

Signaling Pathways	Product ref	Informations
G1-S Regulators	*******	Biomarker list in progress.

Species : Sus Scrofa (Pig)

Pig G1-S Regulators

Signaling Pathways	Product ref	Informations
G1-S Regulators	*******	Biomarker list in progress.

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Bibliography

1. Zhang X, et al. Intact regulation of G1/S transition renders esophageal squamous cell carcinoma sensitive to PI3Kα inhibitors. Signal Transduct Target Ther. (2023)12;8(1):153.

2. Hume S, et al. A unified model for the G1/S cell cycle transition. Nucleic Acids Res. (2020)9;48(22):12483–12501.

3. Rubin SM, et al. Integrating Old and New Paradigms of G1/S Control. Mol Cell. (2020)15;80(2):183-192.

4. DeVeale B, et al. G1/S restriction point coordinates phasic gene expression and cell differentiation. Nat Commun. (2022)27;13:3696.

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