rs41275900

Positions:

• chr9-128617772-G-A
• chr9-128617772-G-T

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The ENST00000372739.7(SPTAN1):​c.5478+12G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00138 in 1,613,634 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00071 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0015 (2 hom.)
• Consequence: SPTAN1 ENST00000372739.7 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:4
• Conservation: PhyloP100: -1.35

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]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.8).
• BP6: Variant 9-128617772-G-A is Benign according to our data. Variant chr9-128617772-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 139300.We mark this variant Likely_benign, oryginal submissions are: {Benign=3, Uncertain_significance=1, Likely_benign=1}. Variant chr9-128617772-G-A is described in Lovd as [Likely_benign].
• BS2: High AC in GnomAd4 at 108 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SPTAN1	NM_001130438.3	c.5478+12G>A		intron_variant		ENST00000372739.7	NP_001123910.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SPTAN1	ENST00000372739.7	c.5478+12G>A		intron_variant		1	NM_001130438.3	ENSP00000361824	P3

Frequencies

GnomAD3 genomes AF: 0.000710 AC: 108 AN: 152208 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000386

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.000864

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.000848

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00115

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000607 AC: 152 AN: 250248 Hom.: 0 AF XY: 0.000584 AC XY: 79 AN XY: 135360

Gnomad AFR exome AF: 0.000309

Gnomad AMR exome AF: 0.0000868

Gnomad ASJ exome AF: 0.000398

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00117

Gnomad NFE exome AF: 0.000991

Gnomad OTH exome AF: 0.000327

GnomAD4 exome AF: 0.00145 AC: 2126 AN: 1461308 Hom.: 2 Cov.: 38 AF XY: 0.00139 AC XY: 1009 AN XY: 726902

Gnomad4 AFR exome AF: 0.000478

Gnomad4 AMR exome AF: 0.0000671

Gnomad4 ASJ exome AF: 0.000497

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.00103

Gnomad4 NFE exome AF: 0.00179

Gnomad4 OTH exome AF: 0.000762

GnomAD4 genome AF: 0.000709 AC: 108 AN: 152326 Hom.: 0 Cov.: 33 AF XY: 0.000685 AC XY: 51 AN XY: 74496

Gnomad4 AFR AF: 0.000385

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.000864

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.000848

Gnomad4 NFE AF: 0.00115

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000296 Hom.: 0

Bravo AF: 0.000642

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Developmental and epileptic encephalopathy, 5 Uncertain:1 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 08, 2013	- -
Benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 15, 2021	- -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

May 15, 2013

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 with suppression bursts Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 01, 2024

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Dec 01, 2022

SPTAN1: BS1 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.80
CADD	Benign	0.70
DANN	Benign	0.54
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs41275900; hg19: chr9-131380051;