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Functionally distinct groups of inherited PTEN mutations in autism and tumour syndromes
Laura Spinelli1, Fiona M Black2, Jonathan N Berg2
1Institute of Biological Chemistry, Biophysics and Bioengineering, School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, UK Division of Cell Signalling and Immunology, College of Life Sciences, University of Dundee, Dundee, UK.
Background:
Germline mutations in the phosphatase PTEN are associated with diverse human pathologies, including tumour susceptibility, developmental abnormalities and autism, but any genotype-phenotype relationships are poorly understood.
Methods:
We have studied the functional consequences of seven PTEN mutations identified in patients diagnosed with autism and macrocephaly and five mutations from severe tumour bearing sufferers of PTEN hamartoma tumour syndrome (PHTS).
Results:
All seven autism-associated PTEN mutants investigated retained the ability to suppress cellular AKT signalling, although five were highly unstable. Observed effects on AKT also correlated with the ability to suppress soma size and the length and density of dendritic spines in primary neurons. Conversely, all five PTEN mutations from severe cases of PHTS appeared to directly and strongly disrupt the ability to inhibit AKT signalling.
Conclusions:
Our work implies that alleles causing incomplete loss of PTEN function are more commonly linked to autism than to severe PHTS cases.
Insights
Germline mutations in phosphatase PTEN (phosphatase and tensin homolog) are linked to autism and PTEN hamartoma tumor syndrome (PHTS). Incomplete PTEN loss of function is more common in autism than severe PHTS.
Area of Science:
- Genetics and Molecular Biology
- Developmental Biology
- Cancer Biology
Background:
- Germline mutations in the PTEN gene are linked to various human conditions, including cancer predisposition, developmental issues, and autism.
- The precise genotype-phenotype correlations for PTEN mutations remain unclear.
- PTEN (phosphatase and tensin homolog) plays a critical role in cellular signaling and growth regulation.
Purpose of the Study:
- To investigate the functional consequences of specific PTEN mutations found in patients with autism and macrocephaly.
- To compare these with PTEN mutations identified in individuals with severe PTEN hamartoma tumor syndrome (PHTS).
- To elucidate genotype-phenotype relationships in PTEN-associated disorders.
Main Methods:
- Functional analysis of seven PTEN mutations from autism/macrocephaly patients and five from severe PHTS patients.
- Assessment of PTEN mutants' ability to suppress cellular AKT signaling.
- Evaluation of PTEN mutant stability and effects on neuronal soma size and dendritic spine morphology.
Main Results:
- Autism-associated PTEN mutants generally retained AKT signaling suppression, though five showed instability.
- Observed AKT suppression correlated with effects on soma size and dendritic spine density in neurons.
- PTEN mutations from severe PHTS cases strongly disrupted AKT signaling inhibition.
Conclusions:
- The study suggests that PTEN alleles leading to incomplete loss of function are more frequently associated with autism.
- Conversely, severe PHTS cases may be linked to PTEN mutations causing a more complete disruption of function.
- Understanding these functional differences is key to diagnosing and treating PTEN-related disorders.
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