10-87933161-G-T

Position:

• chr10-87933161-G-T

Variant summary

Our verdict is Pathogenic. Variant got 27 ACMG points: 27P and 0B. PS1_Very_Strong PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_000314.8(PTEN):​c.402G>T​(p.Met134Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M134?) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTEN NM_000314.8 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.53

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 27 ACMG points.

• PS1: Transcript NM_000314.8 (PTEN) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar as 619908
• PM1: In a hotspot region, there are 12 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 13 uncertain in NM_000314.8
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-87933160-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 427588.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant where missense usually causes diseases, PTEN
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.94
• PP5: Variant 10-87933161-G-T is Pathogenic according to our data. Variant chr10-87933161-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 428267.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTEN	NM_000314.8	c.402G>T	p.Met134Ile	missense_variant	5/9	ENST00000371953.8
PTEN	NM_001304717.5	c.921G>T	p.Met307Ile	missense_variant	6/10
PTEN	NM_001304718.2	c.-349G>T		5_prime_UTR_variant	4/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTEN	ENST00000371953.8	c.402G>T	p.Met134Ile	missense_variant	5/9	1	NM_000314.8	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Quest Diagnostics Nichols Institute San Juan Capistrano

May 18, 2018

- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 29, 2016

The p.M134I variant (also known as c.402G>T), located in coding exon 5 of the PTEN gene, results from a G to T substitution at nucleotide position 402. The methionine at codon 134 is replaced by isoleucine, an amino acid with highly similar properties. Based on internal structural analysis, this variant is anticipated to result in a significant decrease in structural stability (Lee JO et al. Cell. 1999 Oct; 99:323-334). In addition, p.M134I was described to segregate with several individuals of a family presenting with macrocephaly, hypotonia, and learning disabilities, without other signs of PTEN Hamartoma Tumor Syndrome and in particular malignant tumors, even in adulthood (Busa T et al. Gene 2013 Jan; 512(2):194-7. Busa T et al. Eur. J. Paediatr. Neurol. 2015 Mar; 19(2):188-92). This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. To date, this alteration has been detected with an allele frequency of approximately 0.001% (greater than 200000 alleles tested) in our clinical cohort. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	D
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.37	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Uncertain	0.31	D
MutationAssessor	Benign	1.9	L
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.92	D
PROVEAN	Uncertain	-3.9	D
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.98	D
Vest4		0.89
MutPred		0.70		Gain of catalytic residue at L139 (P = 0.0438);
MVP		0.99
MPC		2.3
ClinPred		0.99	D
GERP RS		5.2
Varity_R		0.95
gMVP		0.99

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: rs1114167676; hg19: chr10-89692918; COSMIC: COSV64295066;