rs1554043095

chr5-1294557-CCCCCGCGGG-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM4

The NM_198253.3(TERT):c.320_328del(p.Ala107_Gly109del) variant causes a inframe deletion change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A107A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 34)
• Consequence: TERT NM_198253.3 inframe_deletion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.08

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 Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 12 uncertain in NM_198253.3
• PM4: Nonframeshift variant in NON repetitive region in NM_198253.3.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TERT	NM_198253.3	c.320_328del	p.Ala107_Gly109del	inframe_deletion	2/16	ENST00000310581.10
TERT	NM_001193376.3	c.320_328del	p.Ala107_Gly109del	inframe_deletion	2/15
TERT	NR_149162.3	n.399_407del		non_coding_transcript_exon_variant	2/13
TERT	NR_149163.3	n.399_407del		non_coding_transcript_exon_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TERT	ENST00000310581.10	c.320_328del	p.Ala107_Gly109del	inframe_deletion	2/16	1	NM_198253.3	P2
TERT	ENST00000334602.10	c.320_328del	p.Ala107_Gly109del	inframe_deletion	2/15	1		A2
TERT	ENST00000460137.6	c.320_328del	p.Ala107_Gly109del	inframe_deletion, NMD_transcript_variant	2/13	1
TERT	ENST00000656021.1	c.320_328del	p.Ala107_Gly109del	inframe_deletion, NMD_transcript_variant	2/17

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: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jan 11, 2016

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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: rs1554043095; hg19: chr5-1294672;