20-33443581-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_003098.3(SNTA1):c.40G>A(p.Glu14Lys) variant causes a missense change. The variant allele was found at a frequency of 0.000121 in 1,282,072 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 Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. E14E) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

SNTA1
NM_003098.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 3.62

Publications

3 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: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.1894252).

BS2

High AC in GnomAd4 at 20 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNTA1	NM_003098.3 link	c.40G>A	p.Glu14Lys	missense_variant	Exon 1 of 8	ENST00000217381.3	NP_003089.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNTA1	ENST00000217381.3 link	c.40G>A	p.Glu14Lys	missense_variant	Exon 1 of 8	1	NM_003098.3	ENSP00000217381.2

Frequencies

GnomAD3 genomes

AF:

0.000133

AC:

AN:

150834

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000528

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:

0.000163

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000198

AC:

AN:

40454

AF XY:

0.000203

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000512

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000246

Gnomad OTH exome

AF:

0.000831

GnomAD4 exome

AF:

0.000119

AC:

135

AN:

1131130

Hom.:

Cov.:

AF XY:

0.000129

AC XY:

AN XY:

551194

show subpopulations

African (AFR)

AF:

0.0000447

AC:

AN:

22394

American (AMR)

AF:

0.000296

AC:

AN:

13536

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

16062

East Asian (EAS)

AF:

0.00

AC:

AN:

22236

South Asian (SAS)

AF:

0.00

AC:

AN:

41682

European-Finnish (FIN)

AF:

0.00

AC:

AN:

23458

Middle Eastern (MID)

AF:

0.000661

AC:

AN:

3028

European-Non Finnish (NFE)

AF:

0.000129

AC:

122

AN:

944776

Other (OTH)

AF:

0.000136

AC:

AN:

43958

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

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:

0.000133

AC:

AN:

150942

Hom.:

Cov.:

AF XY:

0.000136

AC XY:

AN XY:

73740

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41432

American (AMR)

AF:

0.000528

AC:

AN:

15164

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3446

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10086

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.000163

AC:

AN:

67532

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.523

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:

0.000136

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Apr 04, 2025

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.40G>A (p.Glu14Lys) results in a conservative amino acid change in 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 0.0002 in 40454 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.40G>A has been reported in the literature in individuals affected with Long QT Syndrome (example: Sarquella-Brugada_2022) . These report(s) do not provide unequivocal conclusions about association of the variant with Long QT Syndrome. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 34546463). ClinVar contains an entry for this variant (Variation ID: 190932). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Long QT syndrome 12

Uncertain:1

Dec 15, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Mar 19, 2018

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The Glu14Lys variant in the SNTA1 gene has not been reported as a disease-causing mutation or as a benign polymorphism to our knowledge. Glu14Lys results in a non-conservative amino acid substitution of a negatively charged Glutamic acid residue with a positively charged Histidine residue at a position that is conserved across species. However, no mutations have been reported in association with LQTS in nearby residues indicating this region of the protein may be tolerant of change. With the clinical and molecular information available at this time, we cannot definitively determine if Glu14Lys is a disease-causing mutation or a rare benign variant. -

Long QT syndrome

Uncertain:1

Nov 21, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 14 of the SNTA1 protein (p.Glu14Lys). This variant is present in population databases (rs786205846, gnomAD 0.05%). This missense change has been observed in individual(s) with long QT syndrome (PMID: 34546463). ClinVar contains an entry for this variant (Variation ID: 190932). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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

Benign:1

Jul 24, 2023

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.98

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.41

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.70

Eigen

Benign

-0.40

Eigen_PC

Benign

-0.34

FATHMM_MKL

Benign

0.72

LIST_S2

Uncertain

0.90

M_CAP

Pathogenic

0.68

MetaRNN

Benign

0.19

MetaSVM

Benign

-0.94

MutationAssessor

Uncertain

2.4

PhyloP100

3.6

PrimateAI

Pathogenic

0.96

PROVEAN

Uncertain

-2.4

REVEL

Benign

0.072

Sift

Uncertain

0.0030

Sift4G

Uncertain

0.0080

Polyphen

0.038

Vest4

0.17

MutPred

0.29

Gain of MoRF binding (P = 0.0312);

MVP

0.44

MPC

1.0

ClinPred

0.31

GERP RS

2.6

PromoterAI

-0.0079

Neutral

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.47

gMVP

0.79

Mutation Taster

=77/23

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