dbSNP rs770213689: POT1:p.Tyr419Cys (chr7-124841086-T-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 0P and 0B.

The NM_015450.3(POT1):c.1256A>G(p.Tyr419Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000242 in 1,612,606 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

POT1
NM_015450.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 3.63

Variant links:

Genes affected

POT1 (HGNC:17284): (protection of telomeres 1) This gene is a member of the telombin family and encodes a nuclear protein involved in telomere maintenance. Specifically, this protein functions as a member of a multi-protein complex that binds to the TTAGGG repeats of telomeres, regulating telomere length and protecting chromosome ends from illegitimate recombination, catastrophic chromosome instability, and abnormal chromosome segregation. Increased transcriptional expression of this gene is associated with stomach carcinogenesis and its progression. Alternatively spliced transcript variants have been described. [provided by RefSeq, Jul 2008]

POT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POT1	NM_015450.3 link	c.1256A>G	p.Tyr419Cys	missense_variant	Exon 14 of 19	ENST00000357628.8	NP_056265.2	Q9NUX5-1A0A024R739

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POT1	ENST00000357628.8 link	c.1256A>G	p.Tyr419Cys	missense_variant	Exon 14 of 19	2	NM_015450.3	ENSP00000350249.3		Q9NUX5-1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

151986

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251074

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135714

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000240

AC:

AN:

1460620

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

726670

show subpopulations

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:

0.0000288

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000263

AC:

AN:

151986

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74242

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000415

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:2

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jun 23, 2022

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

DNA sequence analysis of the POT1 gene demonstrated a sequence change, c.1256A>G, in exon 14 that results in an amino acid change, p.Tyr419Cys. This sequence change has been described in the gnomAD database with a frequency of 0.0023% in the non-Finnish European subpopulation (dbSNP rs770213689). The p.Tyr419Cys change affects a moderately conserved amino acid residue located in a domain of the POT1 protein that is not known to be functional. The p.Tyr419Cys substitution appears to be benign using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL). This sequence change does not appear to have been previously described in individuals with POT1-related disorders. Due to insufficient evidences and the lack of functional studies, the clinical significance of the p.Tyr419Cys change remains unknown at this time. -

not provided

Uncertain:1

Sep 05, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in an individual with melanoma (Simonin-Wilmer et al., 2022); This variant is associated with the following publications: (PMID: 29641532, 36539277) -

Hereditary cancer-predisposing syndrome

Uncertain:1

Dec 18, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Y419C variant (also known as c.1256A>G), located in coding exon 10 of the POT1 gene, results from an A to G substitution at nucleotide position 1256. The tyrosine at codon 419 is replaced by cysteine, an amino acid with highly dissimilar properties. This alteration was identified in 1 of 2928 melanoma cases and 0 of 3298 controls (Simonin-Wilmer I et al. J Med Genet, 2023 Jul;60:692-696). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Tumor predisposition syndrome 3

Uncertain:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 419 of the POT1 protein (p.Tyr419Cys). This variant is present in population databases (rs770213689, gnomAD 0.004%). This variant has not been reported in the literature in individuals affected with POT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 574175). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt POT1 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.070

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.30

T;T;T

Eigen

Uncertain

0.26

Eigen_PC

Uncertain

0.28

FATHMM_MKL

Uncertain

0.90

LIST_S2

Benign

0.83

T;T;.

M_CAP

Benign

0.053

MetaRNN

Uncertain

0.60

D;D;D

MetaSVM

Benign

-0.73

MutationAssessor

Uncertain

2.4

M;.;.

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-2.0

N;D;.

REVEL

Uncertain

0.37

Sift

Benign

0.11

T;T;.

Sift4G

Uncertain

0.0080

D;D;D

Polyphen

0.71

P;.;.

Vest4

0.68

MVP

0.74

MPC

0.50

ClinPred

0.73

GERP RS

5.5

Varity_R

0.55

gMVP

0.59

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over