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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.
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Pathogenetics of the RASopathies.

William E Tidyman¹, Katherine A Rauen²

¹Division of Behavioral and Developmental Pediatrics, Department of Pediatrics UC Davis MIND Institute, Sacramento, CA 95817, USA.

Human Molecular Genetics

|July 15, 2016

Summary

RASopathies are genetic disorders caused by mutations affecting the Ras/mitogen-activated protein kinase (MAPK) pathway, leading to developmental abnormalities. These common malformation syndromes share a common biochemical phenotype of pathway activation.

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Area of Science:

Genetics
Molecular Biology
Developmental Biology

Background:

RASopathies are a group of genetic syndromes resulting from germline mutations in genes regulating the Ras/mitogen-activated protein kinase (MAPK) pathway.
These syndromes affect over 1 in 1,000 individuals, representing a prevalent category of malformation syndromes.
The Ras/MAPK pathway is crucial for cellular processes like growth, differentiation, and apoptosis, and its dysregulation impacts development.

Purpose of the Study:

To define RASopathies as a group of genetic disorders.
To elucidate the common underlying biochemical phenotype of Ras/MAPK pathway activation in RASopathies.
To understand how diverse pathogenetic mechanisms lead to overlapping clinical features.

Main Methods:

Review of existing literature on RASopathies and the Ras/MAPK pathway.
Analysis of pathogenetic mechanisms impacting Ras/MAPK pathway regulation.
Identification of common biochemical phenotypes across different RASopathies.

Main Results:

RASopathies arise from germline mutations affecting Ras/MAPK pathway components or regulators.
Diverse mechanisms, including alterations in GTPases, kinases, and phosphatases, converge on Ras/MAPK pathway activation.
This common pathway activation explains the overlapping phenotypic features observed in various RASopathies.

Conclusions:

RASopathies are characterized by germline mutations leading to Ras/MAPK pathway dysregulation.
The common biochemical phenotype of Ras/MAPK pathway activation underlies the shared developmental alterations in these syndromes.
Understanding these mechanisms is key to comprehending the pathogenesis of RASopathies.