10-87957938-CT-CTT

Variant names:

• chr10-87957938-C-CT
• rs1060500115
• NM_000314.8:c.723dupT

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.723dupT​(p.Glu242fs) variant causes a frameshift, stop gained 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: 32)
• Consequence: PTEN NM_000314.8 frameshift, stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.62

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 10-87957938-C-CT is Pathogenic according to our data. Variant chr10-87957938-C-CT is described in ClinVar as [Pathogenic]. Clinvar id is 404149.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTEN	NM_000314.8	c.723dupT	p.Glu242fs	frameshift_variant, stop_gained	Exon 7 of 9	ENST00000371953.8	NP_000305.3
PTEN	NM_001304717.5	c.1242dupT	p.Glu415fs	frameshift_variant, stop_gained	Exon 8 of 10		NP_001291646.4
PTEN	NM_001304718.2	c.132dupT	p.Glu45fs	frameshift_variant, stop_gained	Exon 7 of 9		NP_001291647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTEN	ENST00000371953.8	c.723dupT	p.Glu242fs	frameshift_variant, stop_gained	Exon 7 of 9	1	NM_000314.8	ENSP00000361021.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cowden syndrome 1 Pathogenic:1

Sep 29, 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. -

PTEN hamartoma tumor syndrome Pathogenic:1

Dec 29, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 404149). This premature translational stop signal has been observed in individuals with clinical features of PTEN hamartoma tumor syndrome (PMID: 16952599, 29510612). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Glu242*) 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). -

Hereditary cancer-predisposing syndrome Pathogenic:1

May 13, 2022

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.723dupT pathogenic mutation, located in coding exon 7 of the PTEN gene, results from a duplication of T at nucleotide position 723, causing a translational frameshift with a predicted alternate stop codon (p.E242*). This mutation was reported as de novo in a patient with a clinical diagnosis of Bannayan-Riley-Ruvalcaba syndrome (BRRS), with features including macrocephaly, axillary lipoma, and thyroid multinodular goiter (Buisson P et al. J Pediatr Surg. 2006;41(9):1601-3). This mutation has also been reported in a patient diagnosed with simultaneous breast cancer, dermatofibrosarcoma protuberans, and follicular thyroid cancer at age 29 who was also found to have multiple gastrointestinal polyps (Won HS et al. Cancer Res Treat, 2018 Feb;:). 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. -

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: rs1060500115; hg19: chr10-89717695;