NM_001330260.2(SCN8A):c.5659A>G (p.Thr1887Ala) AND Early infantile epileptic encephalopathy with suppression bursts

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jun 25, 2019
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:: RCV000793606.8

Allele description [Variation Report for NM_001330260.2(SCN8A):c.5659A>G (p.Thr1887Ala)]

NM_001330260.2(SCN8A):c.5659A>G (p.Thr1887Ala)

Gene:

SCN8A:sodium voltage-gated channel alpha subunit 8 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

12q13.13

Genomic location:

Preferred name:

NM_001330260.2(SCN8A):c.5659A>G (p.Thr1887Ala)

HGVS:

NC_000012.12:g.51807145A>G
NG_021180.3:g.222188A>G
NM_001177984.3:c.5536A>G
NM_001330260.2:c.5659A>GMANE SELECT
NM_001369788.1:c.5536A>G
NM_014191.4:c.5659A>G
NP_001171455.1:p.Thr1846Ala
NP_001317189.1:p.Thr1887Ala
NP_001356717.1:p.Thr1846Ala
NP_055006.1:p.Thr1887Ala
LRG_1389t1:c.5659A>G
LRG_1389t2:c.5659A>G
LRG_1389:g.222188A>G
LRG_1389p1:p.Thr1887Ala
LRG_1389p2:p.Thr1887Ala
NC_000012.11:g.52200929A>G
NM_014191.3:c.5659A>G

Protein change:

T1846A

Links:

dbSNP: rs1592174975

NCBI 1000 Genomes Browser:

rs1592174975

Molecular consequence:

NM_001177984.3:c.5536A>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001330260.2:c.5659A>G - missense variant - [Sequence Ontology: SO:0001583]
NM_001369788.1:c.5536A>G - missense variant - [Sequence Ontology: SO:0001583]
NM_014191.4:c.5659A>G - 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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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000932968	Invitae	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jun 25, 2019)	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

SCV000932968

Invitae

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jun 25, 2019)

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

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, SCV000932968.6

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

Description

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. 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: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SCN8A-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with alanine at codon 1887 of the SCN8A protein (p.Thr1887Ala). The threonine residue is highly conserved and there is a small physicochemical difference between threonine and alanine.

#	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: Feb 20, 2024

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