chr17-63968091-G-T

Position:

• chr17-63968091-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000334.4(SCN4A):​c.968C>A​(p.Thr323Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,702 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SCN4A NM_000334.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.23

Genes affected

SCN4A (HGNC:10591): (sodium voltage-gated channel alpha subunit 4) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with 24 transmembrane domains and one or more regulatory beta subunits. They are responsible for the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. It is expressed in skeletal muscle, and mutations in this gene have been linked to several myotonia and periodic paralysis disorders. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.833

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN4A	NM_000334.4	c.968C>A	p.Thr323Lys	missense_variant	6/24	ENST00000435607.3	NP_000325.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SCN4A	ENST00000435607.3	c.968C>A	p.Thr323Lys	missense_variant	6/24	1	NM_000334.4	ENSP00000396320.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461702 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727136

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.010
CADD	Benign	21
DANN	Benign	0.96
DEOGEN2	Uncertain	0.75	D
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.45
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.45	T
M_CAP	Pathogenic	0.29	D
MetaRNN	Pathogenic	0.83	D
MetaSVM	Uncertain	0.36	D
MutationAssessor	Uncertain	2.1	M
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-2.3	N
REVEL	Uncertain	0.46
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.028	D
Polyphen		0.091	B
Vest4		0.59
MutPred		0.69		Gain of ubiquitination at T323 (P = 0.0121);
MVP		0.76
MPC		0.81
ClinPred		0.82	D
GERP RS		1.8
Varity_R		0.25
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs80338952; hg19: chr17-62045451;