chr5-1294306-GG-AA

Position:

• chr5-1294306-GG-AA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_198253.3(TERT):​c.579_580delCCinsTT​(p.Arg194*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 34)
• Consequence: TERT NM_198253.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.189

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 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-1294306-GG-AA is Pathogenic according to our data. Variant chr5-1294306-GG-AA is described in ClinVar as [Pathogenic]. Clinvar id is 436993.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TERT	NM_198253.3	c.579_580delCCinsTT	p.Arg194*	stop_gained		ENST00000310581.10	NP_937983.2
TERT	NM_001193376.3	c.579_580delCCinsTT	p.Arg194*	stop_gained			NP_001180305.1
TERT	NR_149162.3	n.658_659delCCinsTT		non_coding_transcript_exon_variant	2/13
TERT	NR_149163.3	n.658_659delCCinsTT		non_coding_transcript_exon_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TERT	ENST00000310581.10	c.579_580delCCinsTT	p.Arg194*	stop_gained		1	NM_198253.3	ENSP00000309572.5
TERT	ENST00000334602.10	c.579_580delCCinsTT	p.Arg194*	stop_gained		1		ENSP00000334346.6
TERT	ENST00000460137.6	n.579_580delCCinsTT		non_coding_transcript_exon_variant	2/13	1		ENSP00000425003.1
TERT	ENST00000656021.1	n.579_580delCCinsTT		non_coding_transcript_exon_variant	2/17			ENSP00000499759.1

Frequencies

GnomAD3 genomes Cov.: 34

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 34

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Apr 03, 2017

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Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1554043041; hg19: chr5-1294421;