chr9-128598509-G-T

Variant names:

• chr9-128598509-G-T
• rs915019884
• NM_001130438.3:c.3519+5G>T

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 1P and 4B. PP3 BS2

The NM_001130438.3(SPTAN1):​c.3519+5G>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000939 in 1,597,116 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000097 (0 hom.)
• Consequence: SPTAN1 NM_001130438.3 splice_region, intron
• Scores: Splicing: ADA: 0.9982
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.35
• 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: PanelApp Australia, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, G2P, Ambry Genetics
• 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 -3 ACMG points.

• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
• BS2: High AC in GnomAdExome4 at 14 AD gene.

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.3519+5G>T		splice_region intron	N/A	NP_001123910.1	Q13813-2
	SPTAN1	NM_001375318.1		c.3555+5G>T		splice_region intron	N/A	NP_001362247.1
	SPTAN1	NM_001375310.1		c.3519+5G>T		splice_region intron	N/A	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.3519+5G>T		splice_region intron	N/A	ENSP00000361824.4	Q13813-2
	SPTAN1	ENST00000372731.8	TSL:1	c.3519+5G>T		splice_region intron	N/A	ENSP00000361816.4	Q13813-1
	SPTAN1	ENST00000358161.9	TSL:1	c.3459+5G>T		splice_region intron	N/A	ENSP00000350882.6	Q13813-3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152178 Hom.: 0 Cov.: 32

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

GnomAD4 exome AF: 0.00000969 AC: 14 AN: 1444938 Hom.: 0 Cov.: 28 AF XY: 0.00000975 AC XY: 7 AN XY: 718130

African (AFR) AF: 0.00 AC: 0 AN: 33400

American (AMR) AF: 0.00 AC: 0 AN: 42414

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25812

East Asian (EAS) AF: 0.00 AC: 0 AN: 39540

South Asian (SAS) AF: 0.00 AC: 0 AN: 83908

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52896

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5708

European-Non Finnish (NFE) AF: 0.0000127 AC: 14 AN: 1101302

Other (OTH) AF: 0.00 AC: 0 AN: 59958

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152178 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74338

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

American (AMR) AF: 0.00 AC: 0 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10616

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

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68052

Other (OTH) AF: 0.00 AC: 0 AN: 2094

Alfa AF: 0.0000312 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Developmental and epileptic encephalopathy (2)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.76
CADD	Benign	23
DANN	Benign	0.54
PhyloP100		2.3

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.75
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs915019884; hg19: chr9-131360788;