rs752876848

Positions:

• chr5-1294493-C-T

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 2P and 13B. PM2 BP4_Strong BP6_Very_Strong BP7

The NM_198253.3(TERT):​c.393G>A​(p.Leu131=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000349 in 1,434,584 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: TERT NM_198253.3 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 1.09

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]

ACMG classification

Verdict is Benign. Variant got -11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP6: Variant 5-1294493-C-T is Benign according to our data. Variant chr5-1294493-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 539285.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.09 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TERT	NM_198253.3	c.393G>A	p.Leu131=	synonymous_variant	2/16	ENST00000310581.10	NP_937983.2
TERT	NM_001193376.3	c.393G>A	p.Leu131=	synonymous_variant	2/15		NP_001180305.1
TERT	NR_149162.3	n.472G>A		non_coding_transcript_exon_variant	2/13
TERT	NR_149163.3	n.472G>A		non_coding_transcript_exon_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TERT	ENST00000310581.10	c.393G>A	p.Leu131=	synonymous_variant	2/16	1	NM_198253.3	ENSP00000309572	P2
TERT	ENST00000334602.10	c.393G>A	p.Leu131=	synonymous_variant	2/15	1		ENSP00000334346	A2
TERT	ENST00000460137.6	c.393G>A	p.Leu131=	synonymous_variant, NMD_transcript_variant	2/13	1		ENSP00000425003
TERT	ENST00000656021.1	c.393G>A	p.Leu131=	synonymous_variant, NMD_transcript_variant	2/17			ENSP00000499759

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.0000198 AC: 4 AN: 201686 Hom.: 0 AF XY: 0.00000887 AC XY: 1 AN XY: 112702

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000920

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: 0.0000112

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000349 AC: 5 AN: 1434584 Hom.: 0 Cov.: 35 AF XY: 0.00000281 AC XY: 2 AN XY: 712972

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000688

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: 9.04e-7

Gnomad4 OTH exome AF: 0.0000168

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

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

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 19, 2023

- -

Dyskeratosis congenita Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 22, 2022

This alteration is classified as likely 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	12
DANN	Benign	0.85

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

Other links and lift over

dbSNP: rs752876848; hg19: chr5-1294608;