9-128632721-AAATT-A

Position:

• chr9-128632721-AAATT-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP6_Very_Strong BS2

The NM_001130438.3(SPTAN1):​c.7160+10_7160+13delTTAA variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000305 in 1,613,932 control chromosomes in the GnomAD database, including 3 homozygotes. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.00023 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00031 (3 hom.)
• Consequence: SPTAN1 NM_001130438.3 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 0.439

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP6: Variant 9-128632721-AAATT-A is Benign according to our data. Variant chr9-128632721-AAATT-A is described in ClinVar as [Likely_benign]. Clinvar id is 365181.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAd4 at 35 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPTAN1	NM_001130438.3	c.7160+10_7160+13delTTAA		intron_variant		ENST00000372739.7	NP_001123910.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPTAN1	ENST00000372739.7	c.7160+10_7160+13delTTAA		intron_variant		1	NM_001130438.3	ENSP00000361824.4

Frequencies

GnomAD3 genomes AF: 0.000230 AC: 35 AN: 152158 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00347

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.000283

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000310 AC: 78 AN: 251292 Hom.: 0 AF XY: 0.000309 AC XY: 42 AN XY: 135846

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00294

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.0000924

Gnomad NFE exome AF: 0.000150

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000313 AC: 457 AN: 1461656 Hom.: 3 AF XY: 0.000315 AC XY: 229 AN XY: 727130

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00690

Gnomad4 SAS exome AF: 0.000185

Gnomad4 FIN exome AF: 0.000188

Gnomad4 NFE exome AF: 0.000126

Gnomad4 OTH exome AF: 0.000215

GnomAD4 genome AF: 0.000230 AC: 35 AN: 152276 Hom.: 0 Cov.: 33 AF XY: 0.000201 AC XY: 15 AN XY: 74470

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.0000653

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00348

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.000283

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000130 Hom.: 0

Bravo AF: 0.000223

Asia WGS AF: 0.00173 AC: 6 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Apr 20, 2017

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Early Infantile Epileptic Encephalopathy, Autosomal Dominant Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Early infantile epileptic encephalopathy with suppression bursts Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 15, 2024

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Mar 01, 2024

SPTAN1: BS1 -

Developmental and epileptic encephalopathy, 5 Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 15, 2021

- -

Computational scores

Source: dbNSFP v4.3

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: rs554161838; hg19: chr9-131395000;