2-166303085-C-G

Position:

chr2-166303085-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001365536.1(SCN9A):c.901+5G>C variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000242 in 1,570,162 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

SCN9A
NM_001365536.1 splice_region, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 0.130

Variant links:

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]

SCN9A links:

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

SCN1A-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SCN9A	NM_001365536.1 link	c.901+5G>C		splice_region_variant, intron_variant		ENST00000642356.2	NP_001352465.1

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	UniProt
SCN9A	ENST00000642356.2 link	c.901+5G>C	splice_region_variant, intron_variant		NM_001365536.1	ENSP00000495601.1	Q15858-1
SCN9A	ENST00000303354.11 link	c.901+5G>C	splice_region_variant, intron_variant	5		ENSP00000304748.7	Q15858-1
SCN9A	ENST00000409672.5 link	c.901+5G>C	splice_region_variant, intron_variant	5		ENSP00000386306.1	Q15858-3
SCN9A	ENST00000645907.1 link	c.901+5G>C	splice_region_variant, intron_variant			ENSP00000495983.1	Q15858-4
SCN9A	ENST00000454569.6 link	c.901+5G>C	splice_region_variant, intron_variant	1		ENSP00000413212.2	A0A0C4DG82
SCN9A	ENST00000452182.2 link	c.901+5G>C	splice_region_variant, intron_variant	1		ENSP00000393141.2	H7C064

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152122

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000322

AC:

AN:

217228

Hom.:

AF XY:

0.0000342

AC XY:

AN XY:

116924

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:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000744

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000254

AC:

AN:

1418040

Hom.:

Cov.:

AF XY:

0.0000241

AC XY:

AN XY:

704928

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000324

Gnomad4 OTH exome

AF:

0.0000170

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152122

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74324

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000565

Hom.:

Bravo

AF:

0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 03, 2022

Unlikely to be causative of SCN9A-related neuropathic pain syndromes (AD) Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 04, 2023

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. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 573325). This variant has been observed in individual(s) with congenital insensitivity to pain (PMID: 25995458). This variant is present in population databases (rs756005334, gnomAD 0.007%). This sequence change falls in intron 7 of the SCN9A gene. It does not directly change the encoded amino acid sequence of the SCN9A protein. It affects a nucleotide within the consensus splice site. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Oct 27, 2021

Observed with a variant on the opposite allele (in trans) in a patient with insensitivity to pain in the published literature (PMID: 25995458); In silico analysis, which includes splice predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 30672368, 25995458) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.38

CADD

Benign

DANN

Benign

0.78

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

1.0

SpliceAI score (max)

0.71

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.71

Position offset: 5

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