Is ARF a tumor suppressor?

ARF (alternative reading frame) is a tumor suppressor protein that accumulates in the nucleolus in response to aberrant oncogenic/hyperproliferative signals and induces cell cycle arrest in G1/S or G2/M transition and apoptosis.

Do tumor suppressors repair mutations?

Tumor suppressor genes often function to restrain inappropriate cell growth and division, as well as to stimulate cell death to keep our cells in proper balance. In addition, some of these genes are involved in DNA repair processes, which help prevent the accumulation of mutations in cancer-related genes.

Do tumor suppressors repair DNA?

BRCA 1, BRCA 2, PARP-1: BRCA1 and BRCA2 are tumor suppressor genes that encode proteins involved in the repair of DNA double-strand breaks through the homologous recombination repair pathway.

Is p35 a tumor suppressor?

The TP53 gene provides instructions for making a protein called tumor protein p53 (or p53). This protein acts as a tumor suppressor, which means that it regulates cell division by keeping cells from growing and dividing (proliferating) too fast or in an uncontrolled way.

What does the ARF gene do?

The ARF protein is part of an ARF/MDM2/p53 signaling pathway that negatively regulates cell growth through the capacity of the p53 transcription factor to induce cell cycle arrest and/or apoptosis (Zhang et al., 2001). Expression of ARF increases p53 activity by interacting with the MDM2 protein.

How many types of tumor suppressors are there?

Tumor suppressor genes come in three main types. Each type has a different function: Telling cells to slow down and stop dividing. Repairing damage to cellular DNA that results from dividing and could lead to cancer.

How is ARF activated?

Studies suggest that p19ARF activates p53 by interfering with the ability of Mdm2 to antagonize p53 (35). In some settings, p19ARF sequesters Mdm2 in the nucleolus, allowing p53 to function unopposed in the nucleoplasm (36, 37).

What is ARF p53?

p53 and ARF are well-established tumor suppressor proteins that function together in the negative regulation of cancer. Recently, both of these proteins were found to play surprising roles in autophagy. Autophagy (“self-eating”) is a critical response of eukaryotic cells to metabolic and other stress.

What does ARF gene do?

Alternative reading frame (ARF) is a tumor suppressor protein that senses oncogenic and other stressogenic signals. It can trigger p53-dependent and -independent responses with cell cycle arrest and apoptosis induction being the most prominent ones.

What do ARF proteins do?

The ADP-ribosylation factor (ARF) small GTPases regulate vesicular traffic and organelle structure by recruiting coat proteins, regulating phospholipid metabolism and modulating the structure of actin at membrane surfaces.