rs796052913
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PP3_StrongPP5
The NM_002693.3(POLG):āc.3509T>Gā(p.Leu1170Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,858 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1170P) has been classified as Uncertain significance.
Frequency
Consequence
NM_002693.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
POLG | NM_002693.3 | c.3509T>G | p.Leu1170Arg | missense_variant | 22/23 | ENST00000268124.11 | |
POLGARF | NM_001406557.1 | c.*2781T>G | 3_prime_UTR_variant | 22/23 | |||
POLG | NM_001126131.2 | c.3509T>G | p.Leu1170Arg | missense_variant | 22/23 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
POLG | ENST00000268124.11 | c.3509T>G | p.Leu1170Arg | missense_variant | 22/23 | 1 | NM_002693.3 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251478Hom.: 0 AF XY: 0.00 AC XY: 0AN XY: 135914
GnomAD4 exome AF: 0.00000684 AC: 10AN: 1461858Hom.: 0 Cov.: 32 AF XY: 0.0000110 AC XY: 8AN XY: 727230
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Progressive sclerosing poliodystrophy Pathogenic:1Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | 3billion | Sep 01, 2022 | The variant is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: <0.001%). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.89; 3Cnet: 0.87). However, the evidence of pathogenicity is insufficient at this time. Therefore, this variant is classified as uncertain significance according to the recommendation of ACMG/AMP guideline. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine | Oct 01, 2018 | The NM_002693.2:c.3509T>G (NP_002684.1:p.Leu1170Arg) [GRCH38: NC_000015.10:g.89317510A>C] variant in POLG gene is interpretated to be a Likely Pathogenic based on ACMG guidelines (PMID: 25741868). This variant meets the following evidence codes reported in the ACMG-guideline. PM2:This variant is absent in key population databases. PM3:Detected in trans with a pathogenic variant for Mitochondrial DNA depletion syndrome 4A (Alpers type) which is a recessive disorder. PP2:This is a missense variant in POLG with a low rate of benign and high rate of pathogenic missense variations. PP3:Computational evidence/predictors indicate the variant has deleterious effect on POLG structure, function, or protein-protein interaction. PP4:Patient's phenotype or family history is highly specific for POLG. Based on the evidence criteria codes applied, the variant is suggested to be Likely Pathogenic. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Oct 13, 2022 | This sequence change replaces leucine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1170 of the POLG protein (p.Leu1170Arg). This variant is present in population databases (rs796052913, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with POLG-related conditions. ClinVar contains an entry for this variant (Variation ID: 206618). 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 POLG 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. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at