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PTEN
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PTEN G129R
GenePTEN
Variantmissense
Amino Acid ChangeG129R
Transcript ID (GRCh37/hg19)ENST00000371953
Codon129
Exon5
Genomic Coordinates (GRCh37/hg19)10:89692901-89692901
COSMIC ID5092
Germline/Somatic?Somatic
Pertinent Negative In
Tumor TypePrimary Site
See All Pertinent Negatives

Interpretations

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Tier 2
PTEN
Variants
PTEN any deletion
PTEN G129R
Primary Sites
Brain
Tumor Types
Glioblastoma
Interpretation

PTEN is an obligate haplo-insufficient tumor suppressor gene and is mutated in a large number of cancers. It encodes a phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase. It negatively regulates intracellular levels of phosphatidylinositol-3,4,5-trisphosphate in cells and functions as a tumor suppressor by negatively regulating AKT/mTOR signaling pathway. Most PTEN mutations are loss-of-function mutations. Mono-allelic or bi-allelic loss of PTEN is found in a considerable fraction of tumors, including gliomas (75%). In glioblastoma, PTEN loss/deletion is associated with poor patient prognosis, and/or shorter disease-free survival. There are ongoing clinical trials investigating anti-tumor activity of agents in recurrent glioblastoma with this mutation.

Last updated: 2018-06-13 19:01:42 UTC
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Tier 2
PTEN
Variants
PTEN any missense
PTEN G165R
PTEN G129R
Primary Sites
Bladder
Tumor Types
Urothelial Carcinoma
Interpretation

PTEN is an obligate haplo-insufficient tumor suppressor gene and is mutated in a large number of cancers. It encodes a phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase. It negatively regulates intracellular levels of phosphatidylinositol-3,4,5-trisphosphate in cells and functions as a tumor suppressor by negatively regulating AKT/mTOR signaling pathway. PTEN mutations are loss-of-function mutations and occur in 3% of urothelial carcinomas. The above variants (R130Q and G165R) are predicted to result in loss of function based on preclinical in vitro studies. Whether PTEN alterations predict for responsiveness to mTORC1 inhibitors is less certain at this time.

Last updated: 2019-01-22 19:20:59 UTC
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Tier 2
PTEN
Variants
PTEN G129R
Primary Sites
Lung
Tumor Types
Adenocarcinoma
Interpretation

PTEN is a tumor suppressor gene, and loss of PTEN results in upregulation of the PI3K/ AKT pathway. Loss of PTEN is most commonly due to promoter hypermethylation, while homozygous deletion and nonsense mutations with loss of heterozygosity (LOH) may also occur. PTEN mutations may occur in multiple exons. Somatic mutations in PTEN have been found in 4--8% of non-small cell carcinomas (NSCLC) including adenocarcinomas and squamous cell carcinomas. In preclinical studies, PTEN loss is associated with decreased sensitivity of EGFR mutant lung tumors to EGFR TKIs. Clinical trials assessing the efficacy of PI3K inhibitors in PTEN loss are being explored. This particular variant is known to be oncogenic.

Last updated: 2019-03-11 16:33:09 UTC
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Disclaimer: You assume full responsibility for all risks associated with using this PMKB website. The Englander Institute for Precision Medicine at Weill Cornell Medicine makes no guarantee of the comprehensiveness, reliability or accuracy of the information on this website and assumes no responsibility for errors in the information associated with this web site. Healthcare providers and patients must integrate all clinical and laboratory findings as well as information from a variety of sources before deciding on appropriate clinical care options.


When using PMKB, please cite: Huang et al., JAMIA 2017


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