2-166228969-C-A

Variant names:

• chr2-166228969-C-A
• rs121908913
• NM_001365536.1:c.3928G>T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_001365536.1(SCN9A):​c.3928G>T​(p.Val1310Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SCN9A NM_001365536.1 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 7.91

Genes affected

SCN9A (HGNC:10597): (sodium voltage-gated channel alpha subunit 9) This gene encodes a voltage-gated sodium channel which plays a significant role in nociception signaling. Mutations in this gene have been associated with primary erythermalgia, channelopathy-associated insensitivity to pain, and paroxysmal extreme pain disorder. [provided by RefSeq, Aug 2009]

SCN1A-AS1 (HGNC:54069): (SCN1A and SCN9A antisense RNA 1)

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.968
• PP5: Variant 2-166228969-C-A is Pathogenic according to our data. Variant chr2-166228969-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 6359.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-166228969-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN9A	NM_001365536.1	c.3928G>T	p.Val1310Phe	missense_variant	Exon 22 of 27	ENST00000642356.2	NP_001352465.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN9A	ENST00000642356.2	c.3928G>T	p.Val1310Phe	missense_variant	Exon 22 of 27		NM_001365536.1	ENSP00000495601.1
SCN9A	ENST00000303354.11	c.3928G>T	p.Val1310Phe	missense_variant	Exon 22 of 27	5		ENSP00000304748.7
SCN9A	ENST00000409672.5	c.3895G>T	p.Val1299Phe	missense_variant	Exon 22 of 27	5		ENSP00000386306.1
SCN9A	ENST00000645907.1	c.3895G>T	p.Val1299Phe	missense_variant	Exon 22 of 27			ENSP00000495983.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1457762 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 724922

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Generalized epilepsy with febrile seizures plus, type 7;C2752089:Neuropathy, hereditary sensory and autonomic, type 2A Pathogenic:1

Jun 21, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change results in a protein channel with altered properties (PMID: 21115638, 18599537). This sequence change replaces valine with phenylalanine at codon 1299 of the SCN9A protein (p.Val1299Phe). The valine residue is highly conserved and there is a small physicochemical difference between valine and phenylalanine. This variant is not present in population databases (ExAC no frequency). This variant has been reported to segregate with paroxysmal extreme pain disorder in families (PMID: 17145499, Invitae). ClinVar contains an entry for this variant (Variation ID: 6359). -

not provided Pathogenic:1

Nov 01, 2019

CeGaT Center for Human Genetics Tuebingen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Paroxysmal extreme pain disorder Pathogenic:1

Dec 07, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.58
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	.;D;.;.;D;.
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.94
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;.;D;D;D;D
M_CAP	Pathogenic	0.82	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.7	.;H;.;.;H;H
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-4.8	D;D;.;.;.;D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	D;D;.;.;.;D
Sift4G	Pathogenic	0.0	D;D;.;.;.;D
Vest4		0.98
MutPred		0.84		Gain of loop (P = 0.1069);.;Gain of loop (P = 0.1069);.;.;.;
MVP		0.96
MPC		0.64
ClinPred		1.0	D
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.95
gMVP		0.98

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: rs121908913; hg19: chr2-167085479;