2-165294010-TAAAAAAAAAAAAAAAAAA-TAAAAAAAAAAA

Variant names:

• chr2-165294010-TAAAAAAA-T
• rs67417831
• NM_001040142.2:c.-51-1741_-51-1735delAAAAAAA

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1 BS2

The NM_001040142.2(SCN2A):​c.-51-1741_-51-1735delAAAAAAA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000517 in 151,010 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.000036 (0 hom., cov: 0)
  • Exomes 𝑓: 0.00080 (0 hom.)
• Consequence: SCN2A NM_001040142.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.328
• Publications: 0 publications found

Genes affected

SCN2A (HGNC:10588): (sodium voltage-gated channel alpha subunit 2) Voltage-gated sodium channels are transmembrane glycoprotein complexes composed of a large alpha subunit with four repeat domains, each of which is composed of six membrane-spanning segments, and one or more regulatory beta subunits. Voltage-gated sodium channels function in the generation and propagation of action potentials in neurons and muscle. This gene encodes one member of the sodium channel alpha subunit gene family. Allelic variants of this gene are associated with seizure disorders and autism spectrum disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2016]

SCN2A Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• developmental and epileptic encephalopathy, 11

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• intellectual disability

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• episodic ataxia, type 9

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• seizures, benign familial infantile, 3

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• benign familial infantile epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• benign familial neonatal-infantile seizures

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Dravet syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• malignant migrating partial seizures of infancy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BS1: Variant frequency is greater than expected in population afr. GnomAdExome4 allele frequency = 0.000799 (76/95100) while in subpopulation AFR AF = 0.00148 (4/2706). AF 95% confidence interval is 0.000646. There are 0 homozygotes in GnomAdExome4. There are 41 alleles in the male GnomAdExome4 subpopulation. This position passed quality control check.
• BS2: High AC in GnomAdExome4 at 76 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCN2A	NM_001040142.2	c.-51-1741_-51-1735delAAAAAAA		intron_variant	Intron 1 of 26	ENST00000375437.7	NP_001035232.1
SCN2A	NM_001371246.1	c.-51-1741_-51-1735delAAAAAAA		intron_variant	Intron 1 of 26	ENST00000631182.3	NP_001358175.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCN2A	ENST00000375437.7	c.-51-1762_-51-1756delAAAAAAA		intron_variant	Intron 1 of 26	5	NM_001040142.2	ENSP00000364586.2
SCN2A	ENST00000631182.3	c.-51-1762_-51-1756delAAAAAAA		intron_variant	Intron 1 of 26	5	NM_001371246.1	ENSP00000486885.1
SCN2A	ENST00000424833.5	c.-51-1762_-51-1756delAAAAAAA		intron_variant	Intron 1 of 10	1		ENSP00000406454.2
SCN2A	ENST00000283256.10	c.-176_-170delAAAAAAA		upstream_gene_variant		1		ENSP00000283256.6

Frequencies

GnomAD3 genomes AF: 0.0000358 AC: 2 AN: 55910 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000663

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00158

GnomAD4 exome AF: 0.000799 AC: 76 AN: 95100 Hom.: 0 AF XY: 0.000898 AC XY: 41 AN XY: 45638

African (AFR) AF: 0.00148 AC: 4 AN: 2706

American (AMR) AF: 0.00 AC: 0 AN: 160

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 748

East Asian (EAS) AF: 0.00 AC: 0 AN: 444

South Asian (SAS) AF: 0.000463 AC: 1 AN: 2158

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 42

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 238

European-Non Finnish (NFE) AF: 0.000798 AC: 68 AN: 85184

Other (OTH) AF: 0.000877 AC: 3 AN: 3420

GnomAD4 genome AF: 0.0000358 AC: 2 AN: 55910 Hom.: 0 Cov.: 0 AF XY: 0.0000822 AC XY: 2 AN XY: 24320

African (AFR) AF: 0.00 AC: 0 AN: 13598

American (AMR) AF: 0.00 AC: 0 AN: 3356

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 1982

East Asian (EAS) AF: 0.000663 AC: 1 AN: 1508

South Asian (SAS) AF: 0.00 AC: 0 AN: 864

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 298

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 48

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 33118

Other (OTH) AF: 0.00158 AC: 1 AN: 634

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.33

Splicing

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

Other links and lift over

dbSNP: rs67417831; hg19: chr2-166150520;