rs140951453

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_StrongBP6BP7BS1BS2

The NM_198253.3(TERT):c.1849C>T(p.Leu617=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00108 in 1,613,780 control chromosomes in the GnomAD database, including 11 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. L617L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00086 ( 0 hom., cov: 34)

Exomes 𝑓: 0.0011 ( 11 hom. )

Consequence

TERT
NM_198253.3 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:8

Conservation

PhyloP100: 1.13

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.83).

BP6

Variant 5-1280259-G-A is Benign according to our data. Variant chr5-1280259-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 263104.We mark this variant Likely_benign, oryginal submissions are: {Benign=5, Likely_benign=3, Uncertain_significance=2}. Variant chr5-1280259-G-A is described in Lovd as [Likely_benign].

BP7

Synonymous conserved (PhyloP=1.13 with no splicing effect.

BS1

Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.0011 (1611/1461408) while in subpopulation MID AF= 0.00277 (16/5768). AF 95% confidence interval is 0.00174. There are 11 homozygotes in gnomad4_exome. There are 854 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome at 2 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
TERT	NM_198253.3 linkuse as main transcript	c.1849C>T	p.Leu617=	synonymous_variant	4/16	ENST00000310581.10
TERT	NM_001193376.3 linkuse as main transcript	c.1849C>T	p.Leu617=	synonymous_variant	4/15
TERT	NR_149162.3 linkuse as main transcript	n.1928C>T		non_coding_transcript_exon_variant	4/13
TERT	NR_149163.3 linkuse as main transcript	n.1928C>T		non_coding_transcript_exon_variant	4/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TERT	ENST00000310581.10 linkuse as main transcript	c.1849C>T	p.Leu617=	synonymous_variant	4/16	1	NM_198253.3	P2	O14746-1

Frequencies

GnomAD3 genomes

AF:

0.000860

AC:

131

AN:

152254

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000458

Gnomad ASJ

AF:

0.0112

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.00109

Gnomad OTH

AF:

0.000956

GnomAD3 exomes

AF:

0.00129

AC:

324

AN:

251240

Hom.:

AF XY:

0.00140

AC XY:

190

AN XY:

135878

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000636

Gnomad ASJ exome

AF:

0.0115

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.00101

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.00118

Gnomad OTH exome

AF:

0.00261

GnomAD4 exome

AF:

0.00110

AC:

1611

AN:

1461408

Hom.:

Cov.:

AF XY:

0.00117

AC XY:

854

AN XY:

727000

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.000693

Gnomad4 ASJ exome

AF:

0.0125

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000846

Gnomad4 FIN exome

AF:

0.0000189

Gnomad4 NFE exome

AF:

0.000931

Gnomad4 OTH exome

AF:

0.00209

GnomAD4 genome

AF:

0.000860

AC:

131

AN:

152372

Hom.:

Cov.:

AF XY:

0.000778

AC XY:

AN XY:

74522

show subpopulations

Gnomad4 AFR

AF:

0.0000962

Gnomad4 AMR

AF:

0.000457

Gnomad4 ASJ

AF:

0.0112

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00109

Gnomad4 OTH

AF:

0.000946

Alfa

AF:

0.00209

Hom.:

Bravo

AF:

0.000892

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00169

EpiControl

AF:

0.00225

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Mar 28, 2018	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2024	TERT: BP4, BP7 -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Aug 04, 2021	- -

Aplastic anemia

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Dyskeratosis congenita, autosomal dominant 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

Hereditary cancer-predisposing syndrome;C0265965:Dyskeratosis congenita

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 07, 2020

This alteration is classified as benign based on a combination of the following: 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. -

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

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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

Benign, criteria provided, single submitter

clinical testing

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Jul 07, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.83

Cadd

Benign

9.0

Dann

Benign

0.61

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