NM_001330260.2(SCN8A):c.689C>T (p.Thr230Ile) AND Early infantile epileptic encephalopathy with suppression bursts

Germline classification:: Uncertain significance (1 submission)
Last evaluated:: Jan 1, 2024
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:: RCV003589869.2

Allele description [Variation Report for NM_001330260.2(SCN8A):c.689C>T (p.Thr230Ile)]

NM_001330260.2(SCN8A):c.689C>T (p.Thr230Ile)

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.689C>T (p.Thr230Ile)

HGVS:

NC_000012.12:g.51689079C>T
NG_021180.3:g.104122C>T
NM_001177984.3:c.706+230C>T
NM_001330260.2:c.689C>TMANE SELECT
NM_001369788.1:c.689C>T
NM_014191.4:c.706+230C>T
NP_001317189.1:p.Thr230Ile
NP_001356717.1:p.Thr230Ile
LRG_1389t1:c.689C>T
LRG_1389t2:c.706+230C>T
LRG_1389:g.104122C>T
LRG_1389p1:p.Thr230Ile
NC_000012.11:g.52082863C>T

Protein change:

T230I

Molecular consequence:

NM_001177984.3:c.706+230C>T - intron variant - [Sequence Ontology: SO:0001627]
NM_014191.4:c.706+230C>T - intron variant - [Sequence Ontology: SO:0001627]
NM_001330260.2:c.689C>T - missense variant - [Sequence Ontology: SO:0001583]
NM_001369788.1:c.689C>T - 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
SCV004263051	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jan 1, 2024)	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

SCV004263051

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jan 1, 2024)

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 Labcorp Genetics (formerly Invitae), Labcorp, SCV004263051.1

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

Description

The SCN8A gene has multiple clinically relevant transcripts. This variant occurs in alternate transcript NM_001330260.1, and corresponds to NM_014191.3:c.706+230C>T in the primary transcript. This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 230 of the SCN8A protein (p.Thr230Ile). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SCN8A-related conditions. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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

Last Updated: Sep 29, 2024

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