NM_002693.3(POLG):c.1790G>A (p.Arg597Gln) AND Progressive sclerosing poliodystrophy

Germline classification:: Conflicting interpretations of pathogenicity (2 submissions)
Last evaluated:: Jan 22, 2024
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000699074.10

Allele description [Variation Report for NM_002693.3(POLG):c.1790G>A (p.Arg597Gln)]

NM_002693.3(POLG):c.1790G>A (p.Arg597Gln)

Gene:

POLG:DNA polymerase gamma, catalytic subunit [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

15q26.1

Genomic location:

Preferred name:

NM_002693.3(POLG):c.1790G>A (p.Arg597Gln)

Other names:

p.Arg597Gln

HGVS:

NC_000015.10:g.89325609C>T
NG_008218.2:g.14187G>A
NM_001126131.2:c.1790G>A
NM_002693.3:c.1790G>AMANE SELECT
NP_001119603.1:p.Arg597Gln
NP_002684.1:p.Arg597Gln
NP_002684.1:p.Arg597Gln
LRG_765t1:c.1790G>A
LRG_765:g.14187G>A
LRG_765p1:p.Arg597Gln
NC_000015.9:g.89868840C>T
NM_002693.2:c.1790G>A

Protein change:

R597Q

Links:

dbSNP: rs1001570418

NCBI 1000 Genomes Browser:

rs1001570418

Molecular consequence:

NM_001126131.2:c.1790G>A - missense variant - [Sequence Ontology: SO:0001583]
NM_002693.3:c.1790G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Progressive sclerosing poliodystrophy (MTDPS4A)
Synonyms:: Alpers disease; Alpers diffuse degeneration of cerebral gray matter with hepatic cirrhosis; Alpers progressive infantile poliodystrophy; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0008758; MedGen: C0205710; Orphanet: 726; OMIM: 203700

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000827769	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 22, 2024)	germline	clinical testing	PubMed (6) [See all records that cite these PMIDs] 35289132, 19251978, 20138553, 21880868, 27538604, 28492532
SCV000887148	Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine	criteria provided, single submitter (ACMG Guidelines, 2015)	Pathogenic (Oct 1, 2018)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000827769

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 22, 2024)

germline

clinical testing

PubMed (6)
[See all records that cite these PMIDs]

SCV000887148

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

criteria provided, single submitter

(ACMG Guidelines, 2015)

Pathogenic
(Oct 1, 2018)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Novel and recurrent nuclear gene variations in a cohort of Chinese progressive external ophthalmoplegia patients with multiple mtDNA deletions.

Hou Y, Zhao X, Xie Z, Yu M, Lv H, Zhang W, Yuan Y, Wang Z.

Mol Genet Genomic Med. 2022 May;10(5):e1921. doi: 10.1002/mgg3.1921. Epub 2022 Mar 15.

PubMed [citation]

PMID:: 35289132
PMCID:: PMC9034679

Novel POLG1 mutations associated with neuromuscular and liver phenotypes in adults and children.

Stewart JD, Tennant S, Powell H, Pyle A, Blakely EL, He L, Hudson G, Roberts M, du Plessis D, Gow D, Mewasingh LD, Hanna MG, Omer S, Morris AA, Roxburgh R, Livingston JH, McFarland R, Turnbull DM, Chinnery PF, Taylor RW.

J Med Genet. 2009 Mar;46(3):209-14. doi: 10.1136/jmg.2008.058180.

PubMed [citation]

PMID:: 19251978

See all PubMed Citations (7)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV000827769.7

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (6)

Description

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 597 of the POLG protein (p.Arg597Gln). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This missense change has been observed in individual(s) with progressive external ophthalmoplegia (PMID: 35289132). ClinVar contains an entry for this variant (Variation ID: 576551). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on POLG protein function. This variant disrupts the p.Arg597 amino acid residue in POLG. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 19251978, 20138553, 21880868, 27538604). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine, SCV000887148.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

The NM_002693.2:c.1790G>A (NP_002684.1:p.Arg597Gln) [GRCH38: NC_000015.10:g.89325609C>T] variant in POLG gene is interpretated to be a Pathogenic based on ACMG guidelines (PMID: 25741868). This variant meets the following evidence codes reported in the ACMG-guideline. PS1:This variation causes same amino-acid change as an established pathogenic variant. 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. PP1:This variant is co-segregated with Mitochondrial DNA depletion syndrome 4A (Alpers type) in multiple affected family members. 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 Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Nov 24, 2024

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