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NM_020988.3(GNAO1):c.58G>A (p.Glu20Lys) AND Early infantile epileptic encephalopathy with suppression bursts

Germline classification:
Likely pathogenic (1 submission)
Last evaluated:
Feb 1, 2022
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
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:
RCV001217249.7

Allele description [Variation Report for NM_020988.3(GNAO1):c.58G>A (p.Glu20Lys)]

NM_020988.3(GNAO1):c.58G>A (p.Glu20Lys)

Gene:
GNAO1:G protein subunit alpha o1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
16q13
Genomic location:
Preferred name:
NM_020988.3(GNAO1):c.58G>A (p.Glu20Lys)
HGVS:
  • NC_000016.10:g.56192293G>A
  • NG_042800.1:g.5955G>A
  • NM_020988.3:c.58G>AMANE SELECT
  • NM_138736.3:c.58G>A
  • NP_066268.1:p.Glu20Lys
  • NP_620073.2:p.Glu20Lys
  • NC_000016.9:g.56226205G>A
  • NM_020988.2:c.58G>A
Protein change:
E20K
Links:
dbSNP: rs2036182701
NCBI 1000 Genomes Browser:
rs2036182701
Molecular consequence:
  • NM_020988.3:c.58G>A - missense variant - [Sequence Ontology: SO:0001583]
  • NM_138736.3:c.58G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:
Early infantile epileptic encephalopathy with suppression bursts (EIEE)
Synonyms:
Early infantile epileptic encephalopathy; Ohtahara syndrome; Developmental and epileptic encephalopathy
Identifiers:
MONDO: MONDO:0100062; MedGen: C0393706; Orphanet: 1934; OMIM: PS308350

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV001389083Invitae
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Likely pathogenic
(Feb 1, 2022) 		germlineclinical testing

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

Help

Summary from all submissions

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

Citations

PubMed

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. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]
PMID:
28492532
PMCID:
PMC5632818

Details of each submission

From Invitae, SCV001389083.5

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

Description

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 946388). This missense change has been observed in individual(s) with clinical features of GNAO1-related conditions (Invitae). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 20 of the GNAO1 protein (p.Glu20Lys).

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

Last Updated: May 1, 2024