NM_198253.3:c.2517G>A

Variant names:

• chr5-1268585-C-T
• rs140124989
• NM_198253.3:c.2517G>A

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_198253.3(TERT):​c.2517G>A​(p.Thr839Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00233 in 1,613,422 control chromosomes in the GnomAD database, including 16 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T839T) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0019 (2 hom., cov: 33)
  • Exomes 𝑓: 0.0024 (14 hom.)
• Consequence: TERT NM_198253.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:15
• Conservation: PhyloP100: -1.36
• Publications: 2 publications found

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 Gene-Disease associations (from GenCC):

• pulmonary fibrosis and/or bone marrow failure, Telomere-related, 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• dyskeratosis congenita, autosomal dominant 2

  Inheritance: AR, AD, SD, Unknown Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen, Laboratory for Molecular Medicine
• acute myeloid leukemia

  Inheritance: AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• dyskeratosis congenita

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Hoyeraal-Hreidarsson syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• melanoma, cutaneous malignant, susceptibility to, 9

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -19 ACMG points.

• BP4: Computational evidence support a benign effect (REVEL=0.176).
• BP6: Variant 5-1268585-C-T is Benign according to our data. Variant chr5-1268585-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 263107.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-1.36 with no splicing effect.
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00194 (295/152358) while in subpopulation SAS AF = 0.0058 (28/4828). AF 95% confidence interval is 0.00412. There are 2 homozygotes in GnomAd4. There are 165 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 2 AR,AD,SD,Unknown gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TERT	NM_198253.3	c.2517G>A	p.Thr839Thr	synonymous_variant	Exon 9 of 16	ENST00000310581.10	NP_937983.2
TERT	NM_001193376.3	c.2517G>A	p.Thr839Thr	synonymous_variant	Exon 9 of 15		NP_001180305.1
TERT	NR_149162.3	n.2414G>A		non_coding_transcript_exon_variant	Exon 7 of 13
TERT	NR_149163.3	n.2378G>A		non_coding_transcript_exon_variant	Exon 7 of 13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TERT	ENST00000310581.10	c.2517G>A	p.Thr839Thr	synonymous_variant	Exon 9 of 16	1	NM_198253.3	ENSP00000309572.5

Frequencies

GnomAD3 genomes AF: 0.00193 AC: 294 AN: 152240 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.000362

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00105

Gnomad ASJ AF: 0.00720

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00559

Gnomad FIN AF: 0.00715

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.00188

Gnomad OTH AF: 0.00191

GnomAD2 exomes AF: 0.00282 AC: 706 AN: 250212 AF XY: 0.00314

Gnomad AFR exome AF: 0.000186

Gnomad AMR exome AF: 0.000376

Gnomad ASJ exome AF: 0.00699

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00712

Gnomad NFE exome AF: 0.00202

Gnomad OTH exome AF: 0.00196

GnomAD4 exome AF: 0.00237 AC: 3460 AN: 1461064 Hom.: 14 Cov.: 31 AF XY: 0.00253 AC XY: 1841 AN XY: 726792

African (AFR) AF: 0.000269 AC: 9 AN: 33480

American (AMR) AF: 0.000403 AC: 18 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00784 AC: 205 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00786 AC: 678 AN: 86256

European-Finnish (FIN) AF: 0.00593 AC: 312 AN: 52636

Middle Eastern (MID) AF: 0.00659 AC: 38 AN: 5768

European-Non Finnish (NFE) AF: 0.00182 AC: 2026 AN: 1111982

Other (OTH) AF: 0.00288 AC: 174 AN: 60386

GnomAD4 genome AF: 0.00194 AC: 295 AN: 152358 Hom.: 2 Cov.: 33 AF XY: 0.00221 AC XY: 165 AN XY: 74496

African (AFR) AF: 0.000361 AC: 15 AN: 41588

American (AMR) AF: 0.00105 AC: 16 AN: 15308

Ashkenazi Jewish (ASJ) AF: 0.00720 AC: 25 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00580 AC: 28 AN: 4828

European-Finnish (FIN) AF: 0.00715 AC: 76 AN: 10622

Middle Eastern (MID) AF: 0.0102 AC: 3 AN: 294

European-Non Finnish (NFE) AF: 0.00188 AC: 128 AN: 68030

Other (OTH) AF: 0.00189 AC: 4 AN: 2116

Alfa AF: 0.00198 Hom.: 0

Bravo AF: 0.00134

Asia WGS AF: 0.00115 AC: 4 AN: 3478

EpiCase AF: 0.00196

EpiControl AF: 0.00202

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:15

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:4

-

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

TERT: BP4, BP7 -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

not specified Benign:2

-

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 19, 2015

Genetic Services Laboratory, University of Chicago

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dyskeratosis congenita, autosomal dominant 2 Benign:2

Mar 25, 2019

Johns Hopkins Genomics, Johns Hopkins University

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Dyskeratosis congenita Benign:2

Sep 21, 2016

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Oct 16, 2020

Sema4, Sema4

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Aplastic anemia Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Melanoma, cutaneous malignant, susceptibility to, 9 Benign:1

Feb 01, 2025

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Idiopathic Pulmonary Fibrosis;C3151443:Dyskeratosis congenita, autosomal dominant 2 Benign:1

Jan 29, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Pulmonary fibrosis and/or bone marrow failure, Telomere-related, 1 Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Acute myeloid leukemia Benign:1

Jul 07, 2023

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.096
BayesDel_noAF	Uncertain	0.12
CADD	Benign	0.15
DANN	Benign	0.95
PhyloP100		-1.4
Mutation Taster		=98/2	polymorphism

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

Other links and lift over

dbSNP: rs140124989; hg19: chr5-1268700; COSMIC: COSV104395555;