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RASSF tumor suppressor gene family: biological functions and regulation
Natalia Volodko1, Marilyn Gordon1, Mohamed Salla2
1Department of Pediatrics, Faculty of Medicine and Dentistry, 113 St. 87 Ave., University of Alberta, Edmonton, AB T6G 2E1, Canada.
Abstract:
Genetic changes through allelic loss and nucleic acid or protein modifications are the main contributors to loss of function of tumor suppressor proteins. In particular, epigenetic silencing of genes by promoter hypermethylation is associated with increased tumor severity and poor survival. The RASSF (Ras association domain family) family of proteins consists of 10 members, many of which are tumor suppressor proteins that undergo loss of expression through promoter methylation in numerous types of cancers such as leukemia, melanoma, breast, prostate, neck, lung, brain, colorectal and kidney cancers. In addition to their tumor suppressor function, RASSF proteins act as scaffolding agents in microtubule stability, regulate mitotic cell division, modulate apoptosis, control cell migration and cell adhesion, and modulate NFκB activity and the duration of inflammation. The ubiquitous functions of these proteins highlight their importance in numerous physiological pathways. In this review, we will focus on the biological roles of the RASSF family members and their regulation.
Insights
Ras association domain family (RASSF) proteins are crucial tumor suppressors. Their loss of function, often due to promoter methylation, impacts numerous cancers and cellular processes, highlighting their broad biological significance.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Tumor suppressor proteins often lose function due to genetic alterations or epigenetic silencing, particularly promoter hypermethylation, which correlates with cancer severity.
- The Ras association domain family (RASSF) comprises 10 proteins, many acting as tumor suppressors frequently silenced by methylation in various cancers like leukemia, melanoma, and lung cancer.
Purpose of the Study:
- To review the biological roles of RASSF family members.
- To discuss the regulatory mechanisms affecting RASSF proteins, focusing on epigenetic silencing.
Main Methods:
- Literature review of studies on RASSF protein function and regulation.
- Analysis of genetic and epigenetic alterations in cancer relevant to RASSF family members.
Main Results:
- RASSF proteins are involved in critical cellular functions including microtubule stability, cell division, apoptosis, migration, adhesion, and NFκB signaling.
- Loss of RASSF expression via promoter methylation is a common event in a wide spectrum of human cancers, indicating their role as key tumor suppressors.
Conclusions:
- RASSF proteins are vital in maintaining cellular homeostasis and preventing tumorigenesis.
- Dysregulation of RASSF proteins, especially through epigenetic mechanisms, contributes significantly to cancer development and progression.
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