NM_000314.8:c.955_958delACTT

Variant names:

• chr10-87961041-GTACT-G
• rs146650273
• NM_000314.8:c.955_958delACTT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000314.8(PTEN):​c.955_958delACTT​(p.Thr319fs) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PTEN NM_000314.8 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:12 O:1
• Conservation: PhyloP100: 7.57

Genes affected

PTEN (HGNC:9588): (phosphatase and tensin homolog) This gene was identified as a tumor suppressor that is mutated in a large number of cancers at high frequency. The protein encoded by this gene is a phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase. It contains a tensin like domain as well as a catalytic domain similar to that of the dual specificity protein tyrosine phosphatases. Unlike most of the protein tyrosine phosphatases, this protein preferentially dephosphorylates phosphoinositide substrates. It negatively regulates intracellular levels of phosphatidylinositol-3,4,5-trisphosphate in cells and functions as a tumor suppressor by negatively regulating AKT/PKB signaling pathway. The use of a non-canonical (CUG) upstream initiation site produces a longer isoform that initiates translation with a leucine, and is thought to be preferentially associated with the mitochondrial inner membrane. This longer isoform may help regulate energy metabolism in the mitochondria. A pseudogene of this gene is found on chromosome 9. Alternative splicing and the use of multiple translation start codons results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Feb 2015]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-87961041-GTACT-G is Pathogenic according to our data. Variant chr10-87961041-GTACT-G is described in ClinVar as [Pathogenic]. Clinvar id is 71118.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-87961041-GTACT-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTEN	NM_000314.8	c.955_958delACTT	p.Thr319fs	frameshift_variant	Exon 8 of 9	ENST00000371953.8	NP_000305.3
PTEN	NM_001304717.5	c.1474_1477delACTT	p.Thr492fs	frameshift_variant	Exon 9 of 10		NP_001291646.4
PTEN	NM_001304718.2	c.364_367delACTT	p.Thr122fs	frameshift_variant	Exon 8 of 9		NP_001291647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTEN	ENST00000371953.8	c.955_958delACTT	p.Thr319fs	frameshift_variant	Exon 8 of 9	1	NM_000314.8	ENSP00000361021.3

Frequencies

GnomAD3 genomes Cov.: 31

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:12 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cowden syndrome 1 Pathogenic:3

Oct 02, 2023

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered pathogenic. This variant creates a termination codon and is predicted to result in premature protein truncation. -

Jul 26, 2023

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Criteria applied: PVS1,PS4,PM2_SUP -

Jul 24, 2014

Pathway Genomics

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided Pathogenic:3

-

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 23, 2020

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 17, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); Also known as c.950_953delTACT; This variant is associated with the following publications: (PMID: 26362251, 30675285, 35227301, 9288766, 23470840, 23335809, 24102544, 10400993, 24504448, 18347153, 9619835, 18066063, 26354773, 28852018, 28975465, 32003824, 31594918, 34937768, 29066084, 21194675, 37344881, 33924134, 12415190) -

PTEN hamartoma tumor syndrome Pathogenic:1

Dec 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Thr319*) in the PTEN gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PTEN are known to be pathogenic (PMID: 9467011, 21194675). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Cowden syndrome, Lhermitte-Duclos disease, Parkinson's disease, and Bannayan-Riley-Ruvalcaba syndrome (PMID: 9288766, 10400993, 23335809, 23470840, 24102544, 26362251, 28975465). This variant is also known as c.950_953delTACT. ClinVar contains an entry for this variant (Variation ID: 71118). For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Mar 31, 2022

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.955_958delACTT pathogenic mutation, located in coding exon 8 of the PTEN gene, results from a deletion of 4 nucleotides at nucleotide positions 955 to 958, causing a translational frameshift with a predicted alternate stop codon (p.T319*). This mutation has previously been described in multiple individuals with features of Cowden syndrome including breast cancer, endometrial cancer, thyroid cancer, trichilemmomas, gastrointestinal polyps, and macrocephaly (Rhei E et al. Cancer Res. 1997 Sep;57:3657-9; Kanaseki T et al. Pathobiology 2002;70:34-9; Busch RM et al. Genet. Med. 2013 Jul;15:548-53; Bubien V et al. J. Med. Genet. 2013 Apr;50:255-63; Tan MH et al. Am. J. Hum. Genet. 2011 Jan;88:42-56). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Cowden syndrome Pathogenic:1

Mar 19, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PTEN c.955_958delACTT (p.Thr319X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 251238 control chromosomes. c.955_958delACTT has been reported in the literature in individuals affected with Cowden Syndrome and associated cancers (Rhei_1997, Busch_2013, Chen_2014, Siraj_2017, etc). These data indicate that the variant is likely to be associated with disease. Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Ovarian neoplasm Pathogenic:1

Dec 01, 2018

German Consortium for Hereditary Breast and Ovarian Cancer, University Hospital Cologne

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Breast carcinoma Pathogenic:1

Aug 08, 2021

Medical Genetics Laboratory, Umraniye Training and Research Hospital, University of Health Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Macrocephaly-autism syndrome Pathogenic:1

Feb 23, 2023

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. This variant was predicted to result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant. The variant has been reported at least twice as pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000071118 / PMID: 9288766). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Neoplasm Other:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: -

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs146650273; hg19: chr10-89720798;