rs727503468
Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate
The NM_198253.3(TERT):c.2225G>A(p.Arg742His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,810 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Consequence
NM_198253.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 4 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
TERT | NM_198253.3 | c.2225G>A | p.Arg742His | missense_variant | Exon 6 of 16 | ENST00000310581.10 | NP_937983.2 | |
TERT | NM_001193376.3 | c.2225G>A | p.Arg742His | missense_variant | Exon 6 of 15 | NP_001180305.1 | ||
TERT | NR_149162.3 | n.2304G>A | non_coding_transcript_exon_variant | Exon 6 of 13 | ||||
TERT | NR_149163.3 | n.2268G>A | non_coding_transcript_exon_variant | Exon 6 of 13 |
Ensembl
Frequencies
GnomAD3 genomes Cov.: 33
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461810Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2AN XY: 727206
GnomAD4 genome Cov.: 33
ClinVar
Submissions by phenotype
not provided Uncertain:2
- -
Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28099038, 25393420, 30995915) -
Pulmonary fibrosis Pathogenic:1
Leukocyte telomere length (by qPCR) less than 10th percentile age-adjusted -
not specified Uncertain:1
The Arg742His variant in TERT has not been previously identified in individuals with pulmonary disease or in large population studies. Computation tools (bioche mical amino acid properties, conservation, AlignGVGD, PolyPhen-2, and SIFT) do n ot provide strong support for or against an impact to the protein. In summary, a dditional information is needed to fully assess the clinical significance of the Arg742His variant. -
Idiopathic Pulmonary Fibrosis;C3151443:Dyskeratosis congenita, autosomal dominant 2 Uncertain:1
This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 742 of the TERT protein (p.Arg742His). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with pulmonary fibrosis and inherited bone marrow failure syndrome (PMID: 28099038, 30995915, 33718801). ClinVar contains an entry for this variant (Variation ID: 165378). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TERT protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Dyskeratosis congenita Uncertain:1
The p.R742H variant (also known as c.2225G>A), located in coding exon 6 of the TERT gene, results from a G to A substitution at nucleotide position 2225. The arginine at codon 742 is replaced by histidine, an amino acid with highly similar properties. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at