rs778187343

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP6

The NM_198253.3(TERT):c.887A>C(p.His296Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000191 in 1,575,612 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 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. H296Y) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000072 ( 0 hom., cov: 34)

Exomes 𝑓: 0.00020 ( 0 hom. )

Consequence

TERT
NM_198253.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6B:2

Conservation

PhyloP100: -0.942

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 -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.10802415).

BP6

Variant 5-1293999-T-G is Benign according to our data. Variant chr5-1293999-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 268080.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=5, Likely_benign=1, Benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
TERT	NM_198253.3 linkuse as main transcript	c.887A>C	p.His296Pro	missense_variant	2/16	ENST00000310581.10
TERT	NM_001193376.3 linkuse as main transcript	c.887A>C	p.His296Pro	missense_variant	2/15
TERT	NR_149162.3 linkuse as main transcript	n.966A>C		non_coding_transcript_exon_variant	2/13
TERT	NR_149163.3 linkuse as main transcript	n.966A>C		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.887A>C	p.His296Pro	missense_variant	2/16	1	NM_198253.3	P2	O14746-1
TERT	ENST00000334602.10 linkuse as main transcript	c.887A>C	p.His296Pro	missense_variant	2/15	1		A2	O14746-3
TERT	ENST00000460137.6 linkuse as main transcript	c.887A>C	p.His296Pro	missense_variant, NMD_transcript_variant	2/13	1			O14746-4
TERT	ENST00000656021.1 linkuse as main transcript	c.887A>C	p.His296Pro	missense_variant, NMD_transcript_variant	2/17

Frequencies

GnomAD3 genomes

AF:

0.0000723

AC:

AN:

152066

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:

0.000162

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000483

AC:

AN:

186408

Hom.:

AF XY:

0.0000493

AC XY:

AN XY:

101390

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000111

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000204

AC:

290

AN:

1423546

Hom.:

Cov.:

AF XY:

0.000179

AC XY:

126

AN XY:

705704

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000249

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000260

Gnomad4 OTH exome

AF:

0.0000678

GnomAD4 genome

AF:

0.0000723

AC:

AN:

152066

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74268

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:

0.000162

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000100

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.0000672

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Sep 20, 2019

- -

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. -

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

Oct 31, 2018

- -

Dyskeratosis congenita, autosomal dominant 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 20, 2022

In silico analysis supports that this missense variant does not alter protein structure/function; Published functional studies demonstrate intracellular protein synthesis similar to wild type (Donati et al., 2017); Observed in an individual with hepatocellular carcinoma and in a blood sample from an individual with myelodysplastic syndrome but where germline reference tissue was unavailable for testing (Donati et al., 2017; Reilly et al., 2021); This variant is associated with the following publications: (PMID: 28677271, 34019641) -

Hepatocellular carcinoma

Uncertain:1

Uncertain significance, no assertion criteria provided

case-control

Metabolic Liver Diseases Lab, Fondazione IRCCS Ca Granda Policlinico, University of Milan

Jun 01, 2016

- -

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 27, 2024

- -

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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.064

BayesDel_addAF

Uncertain

0.022

BayesDel_noAF

Benign

-0.21

Cadd

Benign

1.8

Dann

Benign

0.23

DEOGEN2

Uncertain

0.54

D;.

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.020

LIST_S2

Benign

0.50

T;T

M_CAP

Pathogenic

0.47

MetaRNN

Benign

0.11

T;T

MetaSVM

Uncertain

-0.064

MutationAssessor

Benign

0.55

N;N

MutationTaster

Benign

1.0

N;N;N;N

PrimateAI

Benign

0.34

PROVEAN

Benign

-1.0

N;N

REVEL

Uncertain

0.29

Sift

Benign

0.29

T;T

Sift4G

Benign

0.21

T;T

Polyphen

0.16

B;B

Vest4

0.12

MVP

0.63

MPC

1.5

ClinPred

0.058

GERP RS

-2.1

Varity_R

0.054

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