rs781083220

Variant names:

• chr9-128618029-A-G
• rs781083220
• NM_001130438.3:c.5521A>G
• SPTAN1 p.Ile1841Val

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Moderate BS1

The NM_001130438.3(SPTAN1):​c.5521A>G​(p.Ile1841Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000805 in 1,613,936 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. I1841I) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000082 (0 hom.)
• Consequence: SPTAN1 NM_001130438.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.90
• Publications: 0 publications found

Genes affected

SPTAN1 (HGNC:11273): (spectrin alpha, non-erythrocytic 1) Spectrins are a family of filamentous cytoskeletal proteins that function as essential scaffold proteins that stabilize the plasma membrane and organize intracellular organelles. Spectrins are composed of alpha and beta dimers that associate to form tetramers linked in a head-to-head arrangement. This gene encodes an alpha spectrin that is specifically expressed in nonerythrocytic cells. The encoded protein has been implicated in other cellular functions including DNA repair and cell cycle regulation. Mutations in this gene are the cause of early infantile epileptic encephalopathy-5. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Sep 2010]

SPTAN1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 5

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, G2P, PanelApp Australia, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• genetic developmental and epileptic encephalopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• neuronopathy, distal hereditary motor, autosomal dominant 11

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• spastic paraplegia 91, autosomal dominant, with or without cerebellar ataxia

  Inheritance: AD Classification: STRONG Submitted by: PanelApp Australia
• infantile spasms

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary spastic paraplegia

  Inheritance: AR Classification: LIMITED Submitted by: PanelApp Australia

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.18315664).
• BS1: Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.00000821 (12/1461804) while in subpopulation MID AF = 0.000521 (3/5758). AF 95% confidence interval is 0.000142. There are 0 homozygotes in GnomAdExome4. There are 4 alleles in the male GnomAdExome4 subpopulation. Median coverage is 34. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001130438.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTAN1	NM_001130438.3	MANE Select	c.5521A>G	p.Ile1841Val	missense	Exon 43 of 57	NP_001123910.1	Q13813-2
	SPTAN1	NM_001375318.1		c.5557A>G	p.Ile1853Val	missense	Exon 44 of 59	NP_001362247.1
	SPTAN1	NM_001375310.1		c.5521A>G	p.Ile1841Val	missense	Exon 43 of 58	NP_001362239.1	A0A994J6W3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPTAN1	ENST00000372739.7	TSL:1 MANE Select	c.5521A>G	p.Ile1841Val	missense	Exon 43 of 57	ENSP00000361824.4	Q13813-2
	SPTAN1	ENST00000372731.8	TSL:1	c.5506A>G	p.Ile1836Val	missense	Exon 42 of 56	ENSP00000361816.4	Q13813-1
	SPTAN1	ENST00000358161.9	TSL:1	c.5446A>G	p.Ile1816Val	missense	Exon 41 of 55	ENSP00000350882.6	Q13813-3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152132 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

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

GnomAD2 exomes AF: 0.0000119 AC: 3 AN: 251306 AF XY: 0.00000736

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000821 AC: 12 AN: 1461804 Hom.: 0 Cov.: 34 AF XY: 0.00000550 AC XY: 4 AN XY: 727196

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.000521 AC: 3 AN: 5758

European-Non Finnish (NFE) AF: 0.00000719 AC: 8 AN: 1111974

Other (OTH) AF: 0.0000166 AC: 1 AN: 60378

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152132 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74312

African (AFR) AF: 0.00 AC: 0 AN: 41430

American (AMR) AF: 0.00 AC: 0 AN: 15264

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4820

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68030

Other (OTH) AF: 0.00 AC: 0 AN: 2086

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000189

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Early-infantile DEE (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	22
DANN	Benign	0.48
DEOGEN2	Benign	0.082	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.0091
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.80	T
M_CAP	Benign	0.010	T
MetaRNN	Benign	0.18	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	-1.3	N
PhyloP100		8.9
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.17	N
REVEL	Uncertain	0.30
Sift	Benign	1.0	T
Sift4G	Benign	1.0	T
Varity_R		0.070
gMVP		0.14
Mutation Taster		=63/37	polymorphism

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs781083220;

hg19: chr9-131380308;