rs774657340

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_198253.3(TERT):c.863C>T(p.Ala288Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000201 in 1,594,668 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A288G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

TERT
NM_198253.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:1

Conservation

PhyloP100: -0.0410

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 Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.041487217).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
TERT	NM_198253.3 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant	2/16	ENST00000310581.10
TERT	NM_001193376.3 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant	2/15
TERT	NR_149162.3 linkuse as main transcript	n.942C>T		non_coding_transcript_exon_variant	2/13
TERT	NR_149163.3 linkuse as main transcript	n.942C>T		non_coding_transcript_exon_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TERT	ENST00000310581.10 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant	2/16	1	NM_198253.3	P2	O14746-1
TERT	ENST00000334602.10 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant	2/15	1		A2	O14746-3
TERT	ENST00000460137.6 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant, NMD_transcript_variant	2/13	1			O14746-4
TERT	ENST00000656021.1 linkuse as main transcript	c.863C>T	p.Ala288Val	missense_variant, NMD_transcript_variant	2/17

Frequencies

GnomAD3 genomes

AF:

0.0000328

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000511

AC:

AN:

215472

Hom.:

AF XY:

0.0000340

AC XY:

AN XY:

117590

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000247

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000108

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000187

AC:

AN:

1442334

Hom.:

Cov.:

AF XY:

0.0000181

AC XY:

AN XY:

716464

show subpopulations

Gnomad4 AFR exome

AF:

0.0000303

Gnomad4 AMR exome

AF:

0.000372

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000836

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000272

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152334

Hom.:

Cov.:

AF XY:

0.0000268

AC XY:

AN XY:

74490

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000124

Hom.:

Bravo

AF:

0.0000718

ExAC

AF:

0.0000416

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jan 12, 2023	BP4, PP2 -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 12, 2022	In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign germline variant to our knowledge; This variant is associated with the following publications: (PMID: 35456430) -

Hereditary cancer-predisposing syndrome;C0265965:Dyskeratosis congenita

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 15, 2022

The p.A288V variant (also known as c.863C>T), located in coding exon 2 of the TERT gene, results from a C to T substitution at nucleotide position 863. The alanine at codon 288 is replaced by valine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Nov 19, 2021

- -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Jul 01, 2020

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -

TERT-related disorder

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 13, 2023

The TERT c.863C>T variant is predicted to result in the amino acid substitution p.Ala288Val. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.027% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/5-1294138-G-A). It has conflicting interpretations of likely benign and uncertain significance in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/539214). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 13, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.056

BayesDel_noAF

Benign

-0.32

Cadd

Benign

3.9

Dann

Benign

0.93

DEOGEN2

Benign

0.35

T;.

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.045

LIST_S2

Benign

0.72

T;T

M_CAP

Pathogenic

0.38

MetaRNN

Benign

0.041

T;T

MetaSVM

Uncertain

0.083

MutationAssessor

Benign

0.69

N;N

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Benign

0.32

PROVEAN

Benign

-0.79

N;N

REVEL

Benign

0.25

Sift

Benign

0.27

T;T

Sift4G

Benign

0.28

T;T

Polyphen

0.70

P;P

Vest4

0.10

MutPred

0.26

Gain of catalytic residue at A288 (P = 0.1185);Gain of catalytic residue at A288 (P = 0.1185);

MVP

0.43

MPC

1.1

ClinPred

0.033

GERP RS

0.18

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.037

gMVP

0.34

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