NM_198253.3:c.3329C>T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_198253.3(TERT):c.3329C>T(p.Thr1110Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000862 in 1,611,632 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000092 ( 0 hom. )

Consequence

TERT
NM_198253.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:5O:1

Conservation

PhyloP100: 0.0350

Variant links:

Genes affected

TERT (HGNC:11730): (telomerase reverse transcriptase) Telomerase is a ribonucleoprotein polymerase that maintains telomere ends by addition of the telomere repeat TTAGGG. The enzyme consists of a protein component with reverse transcriptase activity, encoded by this gene, and an RNA component which serves as a template for the telomere repeat. Telomerase expression plays a role in cellular senescence, as it is normally repressed in postnatal somatic cells resulting in progressive shortening of telomeres. Deregulation of telomerase expression in somatic cells may be involved in oncogenesis. Studies in mouse suggest that telomerase also participates in chromosomal repair, since de novo synthesis of telomere repeats may occur at double-stranded breaks. Alternatively spliced variants encoding different isoforms of telomerase reverse transcriptase have been identified; the full-length sequence of some variants has not been determined. Alternative splicing at this locus is thought to be one mechanism of regulation of telomerase activity. [provided by RefSeq, Jul 2008]

TERT links:

ENSG00000287486 (HGNC:):

ENSG00000287486 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a region_of_interest CTE (size 196) in uniprot entity TERT_HUMAN there are 17 pathogenic changes around while only 4 benign (81%) in NM_198253.3

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.893

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TERT	NM_198253.3 link	c.3329C>T	p.Thr1110Met	missense_variant	Exon 16 of 16	ENST00000310581.10	NP_937983.2	O14746-1
TERT	NM_001193376.3 link	c.3140C>T	p.Thr1047Met	missense_variant	Exon 15 of 15		NP_001180305.1	O14746-3
TERT	NR_149162.3 link	n.3037C>T		non_coding_transcript_exon_variant	Exon 13 of 13
TERT	NR_149163.3 link	n.3001C>T		non_coding_transcript_exon_variant	Exon 13 of 13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TERT	ENST00000310581.10 link	c.3329C>T	p.Thr1110Met	missense_variant	Exon 16 of 16	1	NM_198253.3	ENSP00000309572.5		O14746-1

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152228

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000330

AC:

AN:

242766

Hom.:

AF XY:

0.0000454

AC XY:

AN XY:

132168

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000564

Gnomad SAS exome

AF:

0.000100

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000274

Gnomad OTH exome

AF:

0.000172

GnomAD4 exome

AF:

0.0000918

AC:

134

AN:

1459404

Hom.:

Cov.:

AF XY:

0.0000896

AC XY:

AN XY:

725848

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000117

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000106

Gnomad4 OTH exome

AF:

0.0000663

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152228

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74352

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000580

Hom.:

Bravo

AF:

0.0000340

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000496

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:5Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Sep 19, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in individuals with shortened telomeres and personal history of idiopathic pulmonary fibrosis or thrombocytopenia in published literature (Armanios et al., 2007; Gutierrez-Rodrigues et al., 2019); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 23716176, 21520174, 20301779, 17392301, 28373299, 17825470, 23618685, 31426295, 30523342, 34019641) -

Nov 12, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The TERT c.3329C>T; p.Thr1110Met variant (rs199422306, ClinVar Variation ID: 39122) is reported in the literature in individuals affected with idiopathic pulmonary fibrosis or thrombocytopenia and these individuals also had shortened telomeres compared to controls (Armanios 2007, Gutierrez-Rodrigues 2019). Additionally, this variant was found in a patient with myelodysplastic syndrome however the variant was not confirmed to be germline (Reilly 2021). This variant is found in the general population with an overall allele frequency of 0.003% (9/274,156 alleles) in the Genome Aggregation Database (v2.1.1). Computational analyses are uncertain whether this variant is neutral or deleterious (REVEL: 0.509). In vitro functional analyses demonstrate decreased telomere elongation activity compared to wildtype (Armanios 2007, Reilly 2021). However, given the lilmited clinical and functional data, the significance of this variant is uncertain at this time. References: Armanios MY et al. Telomerase mutations in families with idiopathic pulmonary fibrosis. N Engl J Med. 2007 Mar 29;356(13):1317-26. PMID: 17392301. Gutierrez-Rodrigues F et al. Pathogenic TERT promoter variants in telomere diseases. Genet Med. 2019 Jul;21(7):1594-1602. PMID: 30523342. Reilly CR et al. The clinical and functional effects of TERT variants in myelodysplastic syndrome. Blood. 2021 Sep 9;138(10):898-911. PMID: 34019641. -

Pulmonary fibrosis

Pathogenic:1

Jun 09, 2022

Garcia Pulmonary Genetics Research Laboratory, Columbia University Irving Medical Center

Significance: Likely risk allele

Review Status: no assertion criteria provided

Collection Method: research

Leukocyte telomere length (by qPCR) less than 10th percentile age-adjusted -

Idiopathic Pulmonary Fibrosis;C3151443:Dyskeratosis congenita, autosomal dominant 2

Uncertain:1

Dec 02, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 1110 of the TERT protein (p.Thr1110Met). This variant is present in population databases (rs199422306, gnomAD 0.01%). This missense change has been observed in individual(s) with idiopathic pulmonary fibrosis and telomeropathies (PMID: 17392301, 30523342, 34019641). ClinVar contains an entry for this variant (Variation ID: 39122). 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 TERT protein function with a negative predictive value of 95%. Experimental studies have shown that this missense change affects TERT function (PMID: 17392301). 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. -

Aplastic anemia;C0023467:Acute myeloid leukemia;C3151443:Dyskeratosis congenita, autosomal dominant 2;C3553617:Pulmonary fibrosis and/or bone marrow failure, Telomere-related, 1;C3554574:Melanoma, cutaneous malignant, susceptibility to, 9;C4551974:Dyskeratosis congenita, autosomal dominant 1;C5561926:Interstitial lung disease 2

Uncertain:1

Aug 04, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dyskeratosis congenita, autosomal dominant 2

Uncertain:1

Mar 11, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Interstitial lung disease 2

Other:1

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Uncertain

0.032

BayesDel_noAF

Uncertain

0.010

CADD

Benign

9.8

DANN

Uncertain

0.98

DEOGEN2

Benign

0.37

T;.

Eigen

Benign

-0.59

Eigen_PC

Benign

-0.73

FATHMM_MKL

Benign

0.030

LIST_S2

Benign

0.75

T;T

M_CAP

Uncertain

0.25

MetaRNN

Pathogenic

0.89

D;D

MetaSVM

Uncertain

0.16

MutationAssessor

Benign

0.0

N;.

PrimateAI

Benign

0.38

PROVEAN

Benign

-0.40

N;N

REVEL

Uncertain

0.51

Sift

Benign

0.092

T;T

Sift4G

Benign

0.076

T;D

Polyphen

0.96

D;P

Vest4

0.65

MutPred

0.71

Loss of glycosylation at T1110 (P = 0.0303);.;

MVP

0.90

MPC

1.6

ClinPred

0.044

GERP RS

2.0

Varity_R

0.027

gMVP

0.15

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

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