Related Experiment Video
Updated: Jul 11, 2025
Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells NPCs
Published on: March 2, 2018
Cancer and Autism: How PTEN Mutations Degrade Function at the Membrane and Isoform Expression in the Human Brain
Hyunbum Jang1, Jiaye Chen2, Lilia M Iakoucheva3
1Computational Structural Biology Section, Frederick National Laboratory for Cancer Research in the Cancer Innovation Laboratory, National Cancer Institute, Frederick, MD 21702, USA.
Abstract:
Mutations causing loss of PTEN lipid phosphatase activity can promote cancer, benign tumors (PHTS), and neurodevelopmental disorders (NDDs). Exactly how they preferentially trigger distinct phenotypic outcomes has been puzzling. Here, we demonstrate that PTEN mutations differentially allosterically bias P loop dynamics and its connection to the catalytic site, affecting catalytic activity. NDD-related mutations are likely to sample conformations of the functional wild-type state, while sampled conformations for the strong, cancer-related driver mutation hotspots favor catalysis-primed conformations, suggesting that NDD mutations are likely to be weaker, and our large-scale simulations show why. Prenatal PTEN isoform expression data suggest exons 5 and 7, which harbor NDD mutations, as cancer-risk carriers. Since cancer requires more than a single mutation, our conformational and genomic analysis helps discover how same protein mutations can foster different clinical manifestations, articulates a role for co-occurring background latent driver mutations, and uncovers relationships of splicing isoform expression to life expectancy.
Insights
PTEN mutations can cause distinct diseases by altering protein dynamics. Cancer-linked mutations favor active states, while neurodevelopmental disorder mutations favor normal states, explaining varied clinical outcomes.
Area of Science:
- Molecular biology
- Genetics
- Biochemistry
Background:
- Mutations in the PTEN gene are linked to various conditions, including cancer, benign tumors (PTEN hamartoma tumor syndrome - PHTS), and neurodevelopmental disorders (NDDs).
- The precise mechanisms by which PTEN mutations lead to such diverse clinical presentations remain unclear.
Purpose of the Study:
- To investigate how PTEN mutations differentially influence protein dynamics and catalytic activity.
- To elucidate the molecular basis for distinct phenotypic outcomes (cancer vs. NDDs) arising from PTEN mutations.
Main Methods:
- Large-scale molecular dynamics simulations were employed to analyze PTEN protein conformations.
- Analysis of prenatal PTEN isoform expression data and genomic data.
- Conformational and genomic analyses were integrated to understand mutation impact.
Main Results:
- PTEN mutations allosterically bias P loop dynamics, affecting catalytic activity.
- NDD-associated mutations tend to sample conformations similar to the wild-type state.
- Cancer-associated mutation hotspots favor catalysis-primed conformations, indicating weaker NDD mutations.
- Exons 5 and 7, harboring NDD mutations, are identified as potential cancer-risk carriers.
- Splicing isoform expression is linked to patient life expectancy.
Conclusions:
- PTEN mutation-induced conformational changes explain the differential clinical manifestations of cancer and NDDs.
- The study highlights the role of co-occurring background mutations in disease development.
- Relationships between PTEN splicing isoforms and life expectancy are uncovered.
Related Concept Videos
03:03mTOR Signaling and Cancer Progression
The mTOR pathway or the...
01:22PI3K/mTOR/AKT Signaling Pathway
01:33Pleiotropy