rs121909223

chr10-87933129-T-Achr10-87933129-T-Cchr10-87933129-T-G

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.370T>A(p.Cys124Ser) 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. 12/20 in silico tools predict a damaging 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. C124R) has been classified as Pathogenic.

• 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: 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 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 2447220
• PM1: In a hotspot region, there are 15 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 15 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 chr10-87933129-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 7817.Status of the report is reviewed_by_expert_panel, 3 stars.
• PP2: Missense variant where missense usually causes diseases, PTEN
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.986
• PP5: Variant 10-87933129-T-A is Pathogenic according to our data. Variant chr10-87933129-T-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 824108.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-87933129-T-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTEN	NM_000314.8	c.370T>A	p.Cys124Ser	missense_variant	5/9	ENST00000371953.8
PTEN	NM_001304717.5	c.889T>A	p.Cys297Ser	missense_variant	6/10
PTEN	NM_001304718.2	c.-381T>A		5_prime_UTR_variant	4/9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTEN	ENST00000371953.8	c.370T>A	p.Cys124Ser	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

Cowden syndrome 1 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München

Feb 10, 2020

- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 19, 2018

The p.C124S variant (also known as c.370T>A), located in coding exon 5 of the PTEN gene, results from a T to A substitution at nucleotide position 370. The cysteine at codon 124 is replaced by serine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. This same alteration, p.C124S, is also produced by a different nucleotide substitution at this codon, c.371G>C. The p.C124S (c.371G>C) alteration has been reported in multiple individuals with Cowden syndrome/Cowden-like syndrome (Tan MH et al. Am. J. Hum. Genet. 2011 Jan; 88(1):42-56; Rodríguez-Escudero I et al. Hum. Mol. Genet. 2011 Nov;20:4132-42; He X et al. J. Clin. Endocrinol. Metab. 2012 Nov;97:E2179-87). This alteration occurs in a catalytically active residue responsible for dephosphorylating the phospholipid second messenger phosphatidylinositol-3,4,5-trisphosphate (PIP3), which is critical for tumor suppressor function (Xiao Y et al. Cell. Signal. 2007 Jul; 19(7):1434-45; Chia JY et al. Biochim. Biophys. Acta. 2010 Sep; 1804(9):1785-95). Further, functional analysis have shown p.C124S results in ablation of the tumor suppressor activity of PTEN (Myers MP et al. Proc. Natl. Acad. Sci. U.S.A., 1998 Nov;95:13513-8; Rodríguez-Escudero I et al. Hum. Mol. Genet. 2011 Nov;20:4132-42). 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	0.59	D
BayesDel_noAF	Pathogenic	0.61
Cadd	Pathogenic	32
Dann	Uncertain	0.99
DEOGEN2	Pathogenic	0.96	D
Eigen	Pathogenic	0.91
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.86	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Pathogenic	3.8	H
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-9.8	D
REVEL	Pathogenic	0.97
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.88
MutPred		0.86		Gain of disorder (P = 5e-04);
MVP		0.99
MPC		2.6
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.98
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs121909223; hg19: chr10-89692886; COSMIC: COSV64288968;