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Published on: August 4, 2019
Inherited PTEN mutations and the prediction of phenotype
Nicholas R Leslie1, Michel Longy2
1Institute of Biological Chemistry, Biophysics and Bioengineering, Nasmyth Building, Heriot Watt University, Edinburgh EH14 4AS, UK.
Abstract:
PTEN has been heavily studied due to its role as a tumour suppressor and as a core inhibitory component of the phosphoinositide 3-kinase (PI3K) signalling network. It is a broadly expressed phosphatase which displays complexity and diversity in both its functions and regulation and accordingly, in the laboratory numerous classes of functionally distinct mutations have been generated. Inherited loss of function mutations in the PTEN gene were originally identified in sufferers of Cowden disease, but later shown to associate with more diverse human pathologies, mostly relating to cell and tissue overgrowth, leading to the use of the broader term, PTEN Hamartoma Tumour Syndrome. Recent phenotypic analysis of clinical cohorts of PTEN mutation carriers, combined with laboratory studies of the consequences of these mutations implies that stable catalytically inactive PTEN mutants may lead to the most severe phenotypes, and conversely, that mutants retaining partial function associate more frequently with a milder phenotype, with autism spectrum disorder often being diagnosed. Future work will be needed to confirm and to refine these genotype-phenotype relationships and convert this developing knowledge into improved patient management and potentially treatment with emerging drugs which target the PI3K pathway.
Insights
Mutations in the PTEN gene, linked to PTEN Hamartoma Tumour Syndrome, can cause varying disease severity. Catalytically inactive PTEN mutants often lead to severe phenotypes, while those retaining partial function are associated with milder conditions like autism spectrum disorder.
Area of Science:
- Genetics
- Molecular Biology
- Oncology
Background:
- The PTEN gene is a crucial tumor suppressor and a key regulator of the phosphoinositide 3-kinase (PI3K) signaling pathway.
- PTEN protein, a broadly expressed phosphatase, exhibits complex functions and regulation, leading to diverse mutation classes.
- Inherited PTEN mutations are associated with Cowden disease and PTEN Hamartoma Tumour Syndrome, characterized by cell and tissue overgrowth.
Purpose of the Study:
- To investigate the relationship between PTEN mutation types and associated clinical phenotypes.
- To explore how different PTEN mutations influence disease severity and specific pathologies.
- To lay the groundwork for improved patient management and targeted therapies for PTEN-related disorders.
Main Methods:
- Analysis of clinical cohorts carrying PTEN mutations.
- Laboratory studies examining the functional consequences of PTEN mutations.
- Genotype-phenotype correlation studies.
Main Results:
- Stable, catalytically inactive PTEN mutants are linked to more severe clinical phenotypes.
- PTEN mutants retaining partial catalytic function are more frequently associated with milder phenotypes, including autism spectrum disorder.
- A spectrum of PTEN mutations correlates with a spectrum of disease severity.
Conclusions:
- PTEN genotype significantly influences phenotype severity in PTEN Hamartoma Tumour Syndrome.
- Understanding these genotype-phenotype relationships is crucial for clinical management.
- Emerging PI3K pathway inhibitors may offer therapeutic potential for patients with PTEN mutations.
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