10-87952116-A-G

Variant names:

• chr10-87952116-A-G
• rs587781784
• NM_000314.8:c.493-2A>G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM6_Strong PVS1 PM2

This summary comes from the ClinGen Evidence Repository: PTEN c.493-2A>G (IVS5-2A>G) meets criteria to be classified as pathogenic for PTEN Hamartoma Tumor syndrome in an autosomal dominant manner using modified ACMG criteria (Mester et al. 2018; manuscript in preparation). Please see a summary of the rules and criteria codes in the “PTEN ACMG Specifications Summary” document (assertion method column).PVS1: Null variant predicted to result in nonsense-mediated decay or causing truncation/frameshift at or 5’ to c.1121 (NM_000314.4).PM6_S: Two probands with presumed de novo occurrence (maternity/paternity not confirmed) in a patient with the disease and no family history. (Internal laboratory contributor(s) SCV000222118.9)PM2: Absent in large sequenced populations. LINK:https://erepo.genome.network/evrepo/ui/classification/CA000478/MONDO:0017623/003

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: PTEN NM_000314.8 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic reviewed by expert panel P:8 O:1
• Conservation: PhyloP100: 8.82

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 14 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM6: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTEN	NM_000314.8	c.493-2A>G		splice_acceptor_variant, intron_variant	Intron 5 of 8	ENST00000371953.8	NP_000305.3
PTEN	NM_001304717.5	c.1012-2A>G		splice_acceptor_variant, intron_variant	Intron 6 of 9		NP_001291646.4
PTEN	NM_001304718.2	c.-99-2A>G		splice_acceptor_variant, intron_variant	Intron 5 of 8		NP_001291647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTEN	ENST00000371953.8	c.493-2A>G		splice_acceptor_variant, intron_variant	Intron 5 of 8	1	NM_000314.8	ENSP00000361021.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460912 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726810

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Cowden syndrome 1 Pathogenic:3

Feb 06, 2025

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.493-2A>G intronic pathogenic mutation results from an A to G substitution two nucleotides upstream disruption of this splice site in the PTEN gene. This pathogenic mutation has been reported in multiple individuals with personal and/or family history consistent with PTEN hamartoma tumor syndrome (PHTS), including Cowden syndrome (PMID: 17526801, 28677221) ClinVar contains an entry for this variant (Variation ID: 141485). This variant is not present in population databases (gnomAD no frequency). In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site. For these reasons, this variant has been classified as Pathogenic. Studies have shown that disruption of this splice site results in skipping of exon 6 and introduces a premature termination codon (PMID: 28677221). The resulting mRNA is expected to undergo nonsensemediated decay. Pathogenic/likely pathogenic mutations in the PTEN gene cause PTEN-Hamartoma Tumor Syndrome. -

Oct 14, 2024

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered pathogenic. This variant occurs within a consensus splice junction and is predicted to result in abnormal mRNA splicing of either an out-of-frame exon or an in-frame exon necessary for protein stability and/or normal function. This variant has been reported in multiple individuals with clinical features of gene-specific disease [PMID: 28677221, 39301391, 35640862, 17526801, 19604110]. -

May 26, 2017

Cancer Genomic Medicine Translational Research Lab, Cleveland Clinic Genomic Medicine Institute

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

not provided Pathogenic:2 Other:1

-

MutSpliceDB: a database of splice sites variants effects on splicing, NIH

Significance: not provided

Review Status: no classification provided

Collection Method: research

- -

Dec 10, 2020

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Canonical splice site variant demonstrated to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease (Chen 2017); Not observed in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 28152038, 28677221, 30311380) -

Jul 08, 2022

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2, PS4_supporting, PVS1 -

PTEN hamartoma tumor syndrome Pathogenic:2

Jul 29, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects an acceptor splice site in intron 5 of the PTEN gene. RNA analysis indicates that disruption of this splice site induces altered splicing and may result in an absent or altered protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individuals with Cowden syndrome (PMID: 17526801, 28677221). ClinVar contains an entry for this variant (Variation ID: 141485). Studies have shown that disruption of this splice site results in skipping of exon 6, and produces a non-functional protein and/or introduces a premature termination codon (PMID: 28677221). For these reasons, this variant has been classified as Pathogenic. -

Oct 18, 2017

Clingen PTEN Variant Curation Expert Panel, Clingen

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

PTEN c.493-2A>G (IVS5-2A>G) meets criteria to be classified as pathogenic for PTEN Hamartoma Tumor syndrome in an autosomal dominant manner using modified ACMG criteria (Mester et al. 2018; manuscript in preparation). Please see a summary of the rules and criteria codes in the 'PTEN ACMG Specifications Summary' document (assertion method column). PVS1: Null variant predicted to result in nonsense-mediated decay or causing truncation/frameshift at or 5' to c.1121 (NM_000314.4). PM6_S: Two probands with presumed de novo occurrence (maternity/paternity not confirmed) in a patient with the disease and no family history. (Internal laboratory contributor(s) SCV000222118.9) PM2: Absent in large sequenced populations. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Oct 03, 2024

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.493-2A>G intronic pathogenic mutation results from an A to G substitution two nucleotides upstream from coding exon 6 in the PTEN gene. This pathogenic mutation has been reported in multiple individuals with personal and/or family history consistent with PTEN hamartoma tumor syndrome (PHTS), including Cowden syndrome (Ambry internal data). It has also been identified as de novo in two probands with clinical features of PHTS, but maternity and/or paternity were not confirmed (Internal communication with ClinGen PTEN Variant Curation Expert Panel). In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site. RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Chen HJ et al. Hum Mutat, 2017 Oct;38:1372-1377; Ambry internal data). Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.20
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Uncertain	0.96	D
GERP RS		5.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.93
SpliceAI score (max)		0.99		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.99		Position offset: 2

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

Publications

LitVar

Other links and lift over

dbSNP: rs587781784; hg19: chr10-89711873; COSMIC: COSV64297091; COSMIC: COSV64297091;