NM_002693.2(POLG):c.2369G>A (p.Arg790His) AND Progressive sclerosing poliodystrophy

Clinical significance:Uncertain significance (Last evaluated: Oct 1, 2018)

Review status:2 stars out of maximum of 4 stars

criteria provided, multiple submitters, no conflicts

Based on:
2 submissions [Details]
Record status:
current
Accession:
RCV000476234.3

Allele description [Variation Report for NM_002693.2(POLG):c.2369G>A (p.Arg790His)]

NM_002693.2(POLG):c.2369G>A (p.Arg790His)

Gene:
POLG:DNA polymerase gamma, catalytic subunit [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
15q26.1
Genomic location:
Preferred name:
NM_002693.2(POLG):c.2369G>A (p.Arg790His)
Other names:
p.R790H:CGT>CAT
HGVS:
  • NC_000015.10:g.89322799C>T
  • NG_008218.2:g.16997G>A
  • NM_002693.2:c.2369G>A
  • NP_002684.1:p.Arg790His
  • LRG_765t1:c.2369G>A
  • LRG_765:g.16997G>A
  • LRG_765p1:p.Arg790His
  • NC_000015.9:g.89866030C>T
Protein change:
R790H
Links:
dbSNP: rs191490663
NCBI 1000 Genomes Browser:
rs191490663
Molecular consequence:
  • NM_002693.2:c.2369G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Progressive sclerosing poliodystrophy (MTDPS4A)
Synonyms:
Alpers Syndrome; Mitochondrial DNA depletion syndrome 4A (Alpers type); Alpers-Huttenlocher Syndrome
Identifiers:
MedGen: C0205710; Orphanet: 726; OMIM: 203700

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Assertion and evidence details

Submission AccessionSubmitterReview Status
(Assertion method)
Clinical Significance
(Last evaluated)
OriginMethodCitations
SCV000543876Invitaecriteria provided, single submitter
Uncertain significance
(Jun 9, 2018)
germlineclinical testing

PubMed (2)
[See all records that cite these PMIDs]

SCV000886960Wong Mito Lab, Molecular and Human Genetics,Baylor College of Medicinecriteria provided, single submitter
Uncertain significance
(Oct 1, 2018)
germlineclinical testing

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

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Mitochondrial DNA polymerase gamma mutations: an ever expanding molecular and clinical spectrum.

Tang S, Wang J, Lee NC, Milone M, Halberg MC, Schmitt ES, Craigen WJ, Zhang W, Wong LJ.

J Med Genet. 2011 Oct;48(10):669-81. doi: 10.1136/jmedgenet-2011-100222. Epub 2011 Aug 31.

PubMed [citation]
PMID:
21880868

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11.

PubMed [citation]
PMID:
28492532
PMCID:
PMC5632818
See all PubMed Citations (3)

Details of each submission

From Invitae, SCV000543876.3

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (2)

Description

This sequence change replaces arginine with histidine at codon 790 of the POLG protein (p.Arg790His). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and histidine. This variant is present in population databases (rs191490663, ExAC 0.04%). This variant has been reported in heterozygous state in an individual affected with Alper's syndrome (PMID: 21880868). ClinVar contains an entry for this variant (Variation ID: 194376). Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, this variant is a rare missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

From Wong Mito Lab, Molecular and Human Genetics,Baylor College of Medicine, SCV000886960.1

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (1)

Description

The NM_002693.2:c.2369G>A (NP_002684.1:p.Arg790His) [GRCH38: NC_000015.10:g.89322799C>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.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Apr 17, 2019

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