rs372911506

Variant names:

• chr15-89327230-C-T
• rs372911506
• NM_002693.3:c.1370G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM1 BP4_Moderate

The NM_002693.3(POLG):​c.1370G>A​(p.Arg457Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000167 in 1,614,114 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R457W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: POLG NM_002693.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 3.75

Genes affected

POLG (HGNC:9179): (DNA polymerase gamma, catalytic subunit) Mitochondrial DNA polymerase is heterotrimeric, consisting of a homodimer of accessory subunits plus a catalytic subunit. The protein encoded by this gene is the catalytic subunit of mitochondrial DNA polymerase. The encoded protein contains a polyglutamine tract near its N-terminus that may be polymorphic. Defects in this gene are a cause of progressive external ophthalmoplegia with mitochondrial DNA deletions 1 (PEOA1), sensory ataxic neuropathy dysarthria and ophthalmoparesis (SANDO), Alpers-Huttenlocher syndrome (AHS), and mitochondrial neurogastrointestinal encephalopathy syndrome (MNGIE). Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM1: In a helix (size 33) in uniprot entity DPOG1_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_002693.3
• BP4: Computational evidence support a benign effect (MetaRNN=0.14373922).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
POLG	NM_002693.3	c.1370G>A	p.Arg457Gln	missense_variant	Exon 7 of 23	ENST00000268124.11	NP_002684.1
POLG	NM_001126131.2	c.1370G>A	p.Arg457Gln	missense_variant	Exon 7 of 23		NP_001119603.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
POLG	ENST00000268124.11	c.1370G>A	p.Arg457Gln	missense_variant	Exon 7 of 23	1	NM_002693.3	ENSP00000268124.5

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152234 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000482

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000318 AC: 8 AN: 251470 AF XY: 0.0000294

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000164 AC: 24 AN: 1461880 Hom.: 0 Cov.: 33 AF XY: 0.0000193 AC XY: 14 AN XY: 727238

Gnomad4 AFR exome AF: 0.000209 AC: 7 AN: 33480

Gnomad4 AMR exome AF: 0.00 AC: 0 AN: 44724

Gnomad4 ASJ exome AF: 0.00 AC: 0 AN: 26136

Gnomad4 EAS exome AF: 0.0000504 AC: 2 AN: 39700

Gnomad4 SAS exome AF: 0.0000580 AC: 5 AN: 86258

Gnomad4 FIN exome AF: 0.00 AC: 0 AN: 53412

Gnomad4 NFE exome AF: 0.00000629 AC: 7 AN: 1112006

Gnomad4 Remaining exome AF: 0.0000497 AC: 3 AN: 60396

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152234 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74370

Gnomad4 AFR AF: 0.0000482 AC: 0.0000482369 AN: 0.0000482369

Gnomad4 AMR AF: 0.00 AC: 0 AN: 0

Gnomad4 ASJ AF: 0.00 AC: 0 AN: 0

Gnomad4 EAS AF: 0.000193 AC: 0.00019253 AN: 0.00019253

Gnomad4 SAS AF: 0.00 AC: 0 AN: 0

Gnomad4 FIN AF: 0.00 AC: 0 AN: 0

Gnomad4 NFE AF: 0.00 AC: 0 AN: 0

Gnomad4 OTH AF: 0.00 AC: 0 AN: 0

Alfa AF: 0.000109 Hom.: 0

Bravo AF: 0.0000378

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.0000330 AC: 4

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Progressive sclerosing poliodystrophy Uncertain:2

Oct 01, 2018

Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NM_002693.2:c.1370G>A (NP_002684.1:p.Arg457Gln) [GRCH38: NC_000015.10:g.89327230C>T] variant in POLG gene is interpretated to be a Uncertain Significance 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. Based on the evidence criteria codes applied, the variant is suggested to be Uncertain Significance. -

Jul 12, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 457 of the POLG protein (p.Arg457Gln). This variant is present in population databases (rs372911506, gnomAD 0.01%). This missense change has been observed in individual(s) with asymmetric ataxia, depression, memory loss, epilepsy, and axonal neuropathy (PMID: 29278894). ClinVar contains an entry for this variant (Variation ID: 576988). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -

not provided Uncertain:1

Aug 04, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 29278894, 34194468) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.22
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Benign	0.20	T;T
Eigen	Benign	-0.068
Eigen_PC	Benign	0.032
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.94	.;D
M_CAP	Benign	0.065	D
MetaRNN	Benign	0.14	T;T
MetaSVM	Benign	-0.29	T
MutationAssessor	Benign	0.69	N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.090	N;N
REVEL	Benign	0.26
Sift	Benign	0.50	T;T
Sift4G	Benign	0.37	T;T
Polyphen		0.76	P;P
Vest4		0.33
MVP		0.90
MPC		0.25
ClinPred		0.051	T
GERP RS		3.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.13
gMVP		0.20
Mutation Taster		=86/14	polymorphism

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: rs372911506; hg19: chr15-89870461;