chr7-124892313-T-C

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_015450.3(POT1):c.77A>G(p.Tyr26Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000013 in 1,544,122 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y26N) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 7.2e-7 ( 0 hom. )

Consequence

POT1
NM_015450.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 5.47

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

pulmonary fibrosis and/or bone marrow failure syndrome, telomere-related, 8
Inheritance: AD Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
tumor predisposition syndrome 3
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
glioma susceptibility 9
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
thyroid gland carcinoma
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
cerebroretinal microangiopathy with calcifications and cysts 3
Inheritance: AR Classification: LIMITED Submitted by: G2P, Ambry Genetics

POT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POT1	NM_015450.3 link	c.77A>G	p.Tyr26Cys	missense_variant	Exon 6 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.77A>G	p.Tyr26Cys	missense_variant	Exon 6 of 19	2	NM_015450.3	ENSP00000350249.3		Q9NUX5-1

Frequencies

GnomAD3 genomes

AF:

0.00000660

AC:

AN:

151480

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000148

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

7.18e-7

AC:

AN:

1392642

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

691558

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

28664

American (AMR)

AF:

0.00

AC:

AN:

29448

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

24222

East Asian (EAS)

AF:

0.00

AC:

AN:

34678

South Asian (SAS)

AF:

0.0000133

AC:

AN:

75074

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52804

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5560

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1084708

Other (OTH)

AF:

0.00

AC:

AN:

57484

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00000660

AC:

AN:

151480

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

73998

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

41366

American (AMR)

AF:

0.00

AC:

AN:

15112

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3454

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000148

AC:

AN:

67602

Other (OTH)

AF:

0.00

AC:

AN:

2076

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.275

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Tumor predisposition syndrome 3

Uncertain:1

Sep 18, 2023

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 26 of the POT1 protein (p.Tyr26Cys). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. 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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt POT1 protein function. ClinVar contains an entry for this variant (Variation ID: 475102). This missense change has been observed in individual(s) with clinical features of POT1-related conditions (Invitae). -

Hereditary cancer-predisposing syndrome

Uncertain:1

Jul 28, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.Y26C variant (also known as c.77A>G), located in coding exon 2 of the POT1 gene, results from an A to G substitution at nucleotide position 77. The tyrosine at codon 26 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.37

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Uncertain

0.13

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.90

D;D;D

Eigen

Uncertain

0.31

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.87

LIST_S2

Benign

0.85

D;.;D

M_CAP

Benign

0.034

MetaRNN

Uncertain

0.73

D;D;D

MetaSVM

Benign

-0.81

MutationAssessor

Benign

2.0

M;.;.

PhyloP100

5.5

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-5.6

D;D;.

REVEL

Uncertain

0.43

Sift

Benign

0.091

T;T;.

Sift4G

Benign

0.086

T;.;.

Polyphen

0.49

P;.;.

Vest4

0.89

MutPred

0.57

Loss of phosphorylation at Y26 (P = 0.1779);Loss of phosphorylation at Y26 (P = 0.1779);Loss of phosphorylation at Y26 (P = 0.1779);

MVP

0.87

MPC

2.2

ClinPred

0.96

GERP RS

5.7

Varity_R

0.80

gMVP

0.87

Mutation Taster

=27/73

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over