20-33443551-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_003098.3(SNTA1):c.70G>A(p.Gly24Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000239 in 1,336,544 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000024 ( 2 hom. )

Consequence

SNTA1
NM_003098.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 0.200

Publications

1 publications found

Variant links:

Genes affected

SNTA1 (HGNC:11167): (syntrophin alpha 1) Syntrophins are cytoplasmic peripheral membrane scaffold proteins that are components of the dystrophin-associated protein complex. This gene is a member of the syntrophin gene family and encodes the most common syntrophin isoform found in cardiac tissues. The N-terminal PDZ domain of this syntrophin protein interacts with the C-terminus of the pore-forming alpha subunit (SCN5A) of the cardiac sodium channel Nav1.5. This protein also associates cardiac sodium channels with the nitric oxide synthase-PMCA4b (plasma membrane Ca-ATPase subtype 4b) complex in cardiomyocytes. This gene is a susceptibility locus for Long-QT syndrome (LQT) - an inherited disorder associated with sudden cardiac death from arrhythmia - and sudden infant death syndrome (SIDS). This protein also associates with dystrophin and dystrophin-related proteins at the neuromuscular junction and alters intracellular calcium ion levels in muscle tissue. [provided by RefSeq, Jan 2013]

SNTA1 Gene-Disease associations (from GenCC):

long QT syndrome 12
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
long QT syndrome
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

SNTA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

BP4

Computational evidence support a benign effect (MetaRNN=0.06368342).

BS2

High AC in GnomAdExome4 at 29 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNTA1	NM_003098.3 link	c.70G>A	p.Gly24Ser	missense_variant	Exon 1 of 8	ENST00000217381.3	NP_003089.1	Q13424-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNTA1	ENST00000217381.3 link	c.70G>A	p.Gly24Ser	missense_variant	Exon 1 of 8	1	NM_003098.3	ENSP00000217381.2		Q13424-1

Frequencies

GnomAD3 genomes

AF:

0.0000199

AC:

AN:

150662

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000661

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000483

GnomAD2 exomes

AF:

0.0000290

AC:

AN:

68942

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000777

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000534

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000245

AC:

AN:

1185882

Hom.:

Cov.:

AF XY:

0.0000207

AC XY:

AN XY:

580684

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

24536

American (AMR)

AF:

0.0000910

AC:

AN:

21976

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19110

East Asian (EAS)

AF:

0.000170

AC:

AN:

23570

South Asian (SAS)

AF:

0.00

AC:

AN:

52176

European-Finnish (FIN)

AF:

0.00

AC:

AN:

25608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3274

European-Non Finnish (NFE)

AF:

0.00000206

AC:

AN:

968940

Other (OTH)

AF:

0.000450

AC:

AN:

46692

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000199

AC:

AN:

150662

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73542

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41288

American (AMR)

AF:

0.0000661

AC:

AN:

15130

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3440

East Asian (EAS)

AF:

0.000193

AC:

AN:

5168

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10068

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67440

Other (OTH)

AF:

0.000483

AC:

AN:

2070

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000567

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Feb 19, 2016

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:provider interpretation

- -

Jul 11, 2025

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis suggests that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

not specified

Uncertain:1

Jul 09, 2018

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: SNTA1 c.70G>A (p.Gly24Ser) results in a non-conservative amino acid change located in the Pleckstrin homology domain (IPR001849) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4.4e-05 in 68340 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.70G>A in individuals affected with Arrhythmia and no experimental evidence demonstrating its impact on protein function have been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Long QT syndrome

Uncertain:1

May 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 24 of the SNTA1 protein (p.Gly24Ser). This variant is present in population databases (rs786205847, gnomAD 0.06%). This variant has not been reported in the literature in individuals affected with SNTA1-related conditions. ClinVar contains an entry for this variant (Variation ID: 190933). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The serine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype

Uncertain:1

Nov 30, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.G24S variant (also known as c.70G>A), located in coding exon 1 of the SNTA1 gene, results from a G to A substitution at nucleotide position 70. The glycine at codon 24 is replaced by serine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. The evidence for this gene-disease relationship is limited; therefore, the clinical significance of this alteration is unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.42

BayesDel_noAF

Benign

-0.48

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.22

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.37

FATHMM_MKL

Benign

0.38

LIST_S2

Benign

0.68

M_CAP

Uncertain

0.14

MetaRNN

Benign

0.064

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.0

PhyloP100

0.20

PrimateAI

Pathogenic

0.89

PROVEAN

Benign

-0.30

REVEL

Benign

0.041

Sift

Pathogenic

0.0

Sift4G

Benign

0.080

Polyphen

0.18

Vest4

0.13

MutPred

0.16

Gain of phosphorylation at G24 (P = 0.033);

MVP

0.35

MPC

0.28

ClinPred

0.12

GERP RS

4.0

PromoterAI

-0.019

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.25

gMVP

0.45

Mutation Taster

=84/16

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over