2-166406295-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_002976.4(SCN7A):c.4334A>G(p.Asn1445Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000577 in 1,612,992 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000058 ( 0 hom. )

Consequence

SCN7A
NM_002976.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.186

Variant links:

Genes affected

SCN7A (HGNC:10594): (sodium voltage-gated channel alpha subunit 7) This gene encodes one of the many voltage-gated sodium channel proteins. For proper functioning of neurons and muscles during action potentials, voltage-gated sodium channels direct sodium ion diffusion for membrane depolarization. This sodium channel protein has some atypical characteristics; the similarity between the human and mouse proteins is lower compared to other orthologous sodium channel pairs. Also, the S4 segments, which sense voltage changes, have fewer positive charged residues that in other sodium channels; domain 4 has fewer arginine and lysine residues compared to other sodium channel proteins. Several alternatively spliced transcript variants exist, but the full-length natures of all of them remain unknown. [provided by RefSeq, Dec 2011]

SCN7A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.08986378).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCN7A	NM_002976.4 linkuse as main transcript	c.4334A>G	p.Asn1445Ser	missense_variant	26/26	ENST00000643258.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
SCN7A	ENST00000643258.1 linkuse as main transcript	c.4334A>G	p.Asn1445Ser	missense_variant	26/26		NM_002976.4	P1
SCN7A	ENST00000441411.2 linkuse as main transcript	c.4334A>G	p.Asn1445Ser	missense_variant	25/25	1		P1
SCN7A	ENST00000424326.5 linkuse as main transcript	c.*2139A>G		3_prime_UTR_variant, NMD_transcript_variant	26/26	1

Frequencies

GnomAD3 genomes

AF:

0.0000527

AC:

AN:

151888

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000194

Gnomad SAS

AF:

0.00145

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000113

AC:

AN:

248456

Hom.:

AF XY:

0.000185

AC XY:

AN XY:

134784

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000883

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.0000582

AC:

AN:

1461104

Hom.:

Cov.:

AF XY:

0.0000867

AC XY:

AN XY:

726856

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000504

Gnomad4 SAS exome

AF:

0.000858

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.0000994

GnomAD4 genome

AF:

0.0000527

AC:

AN:

151888

Hom.:

Cov.:

AF XY:

0.0000809

AC XY:

AN XY:

74168

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000194

Gnomad4 SAS

AF:

0.00145

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ExAC

AF:

0.000124

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 10, 2023

The c.4334A>G (p.N1445S) alteration is located in exon 25 (coding exon 24) of the SCN7A gene. This alteration results from a A to G substitution at nucleotide position 4334, causing the asparagine (N) at amino acid position 1445 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.076

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.25

Cadd

Benign

9.2

Dann

Uncertain

0.99

DEOGEN2

Uncertain

0.73

D;D;D;D;D

Eigen

Benign

-0.47

Eigen_PC

Benign

-0.42

FATHMM_MKL

Benign

0.42

M_CAP

Benign

0.033

MetaRNN

Benign

0.090

T;T;T;T;T

MetaSVM

Uncertain

0.38

MutationAssessor

Benign

1.4

L;L;L;L;L

MutationTaster

Benign

0.97

PrimateAI

Benign

0.29

Sift4G

Uncertain

0.051

T;T;T;.;.

Polyphen

0.25

B;B;B;B;B

Vest4

0.057

MutPred

0.56

Gain of disorder (P = 0.0545);Gain of disorder (P = 0.0545);Gain of disorder (P = 0.0545);Gain of disorder (P = 0.0545);Gain of disorder (P = 0.0545);

MVP

0.83

MPC

0.037

ClinPred

0.13

GERP RS

2.7

Varity_R

0.35

gMVP

0.58

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over