NM_000314.8:c.752_753delGTinsTG

Variant names:

• chr10-87957970-GT-TG
• rs1114167664
• NM_000314.8:c.752_753delGTinsTG

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP2 PP3 PP5_Moderate

The NM_000314.8(PTEN):​c.752_753delGTinsTG​(p.Gly251Val) variant causes a missense 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 Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTEN NM_000314.8 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• 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 Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a strand (size 21) in uniprot entity PTEN_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_000314.8
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the PTEN gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 209 curated pathogenic missense variants (we use a threshold of 10). The gene has 22 curated benign missense variants. Gene score misZ: 3.4883 (above the threshold of 3.09). Trascript score misZ: 4.1129 (above the threshold of 3.09). GenCC associations: The gene is linked to Lhermitte-Duclos disease, Bannayan-Riley-Ruvalcaba syndrome, Proteus syndrome, macrocephaly-autism syndrome, Cowden syndrome 1, Cowden disease, Proteus-like syndrome, leiomyosarcoma, activated PI3K-delta syndrome, PTEN hamartoma tumor syndrome, glioma susceptibility 2, renal cell carcinoma.
• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
• PP5: Variant 10-87957970-GT-TG is Pathogenic according to our data. Variant chr10-87957970-GT-TG is described in ClinVar as [Likely_pathogenic]. Clinvar id is 428249.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTEN	NM_000314.8	c.752_753delGTinsTG	p.Gly251Val	missense_variant		ENST00000371953.8	NP_000305.3
PTEN	NM_001304717.5	c.1271_1272delGTinsTG	p.Gly424Val	missense_variant			NP_001291646.4
PTEN	NM_001304718.2	c.161_162delGTinsTG	p.Gly54Val	missense_variant			NP_001291647.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTEN	ENST00000371953.8	c.752_753delGTinsTG	p.Gly251Val	missense_variant		1	NM_000314.8	ENSP00000361021.3

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Oct 02, 2017

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.G251V variant (also known as c.752_753delGTinsTG), located in coding exon 7 of the PTEN gene, results from a substitution of the GT at nucleotide positions 752 and 753 with TG. The glycine at codon 251 is replaced by valine, an amino acid with dissimilar properties. This alteration has been identified in an individual with features of Cowden syndrome (Ambry internal data). Another alteration at the same codon, p.G251C, was reported to have reduced relative phosphatase activity against the Ins(1,3,4,5)P4 phosphoinositide similar to that of the null mutant in an in vitro functional assay (Han SY et al. Cancer Res., 2000 Jun;60:3147-51). Based on internal structural analysis, p.G251V is in a hotspot region and disrupts the local structure more than other nearby pathogenic variants (Han SY et al. Cancer Res., 2000 Jun;60:3147-51; Lee JO et al. Cell, 1999 Oct;99:323-34). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD) (Lek M et al. Nature, 2016 08;536:285-91). This amino acid position is highly conserved in available vertebrate species. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1114167664; hg19: chr10-89717727;