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The Ras Gene

The Ras Gene

The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...

Renewal of Skin Epidermal Stem Cells

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular cells,...

The Ras Gene

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...

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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...

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Related Experiment Video

Updated: Jun 6, 2026

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods

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Published on: July 17, 2019

Ras and Raf pathways in epidermis development and carcinogenesis.

F Kern¹, T Niault, M Baccarini

¹University of Vienna, Center for Molecular Biology, Max F. Perutz Laboratories, Doktor-Bohr-Gasse 9, A-1030 Vienna, Austria.

British Journal of Cancer

|November 18, 2010

Summary

Ras and Raf signaling pathways are crucial for skin cell renewal and cancer. Raf-1 specifically restrains keratinocyte differentiation, enabling the growth and persistence of Ras-driven skin tumors.

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Area of Science:

Dermatology
Oncology
Molecular Biology

Background:

The epidermis renews itself through balanced keratinocyte proliferation and differentiation.
Disruptions in signaling pathways controlling these processes can lead to skin cancer (carcinogenesis).

Purpose of the Study:

To review the roles of Ras and its downstream effector Raf in epidermal homeostasis and skin tumor development.
To highlight the specific role of Raf-1 in maintaining Ras-driven skin tumors.

Main Methods:

Literature review focusing on Ras, Raf, and Raf-1 signaling in epidermal biology and cancer.
Analysis of molecular mechanisms underlying keratinocyte proliferation, differentiation, and oncogenesis.

Main Results:

Ras oncogenes are critical in skin neoplasia.
Raf-1 acts as a key regulator by inhibiting keratinocyte differentiation.
This inhibition by Raf-1 is essential for the development and maintenance of Ras-driven skin tumors.

Conclusions:

Dysregulation of Ras-Raf signaling, particularly Raf-1's role in suppressing differentiation, is a critical factor in skin carcinogenesis.
Targeting these pathways may offer therapeutic strategies for skin neoplasms.