rs370531842

Variant names:

• chr20-33408583-G-A
• rs370531842
• NM_003098.3:c.1442C>T

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 1P and 5B. PP3 BP6 BS2

The NM_003098.3(SNTA1):​c.1442C>T​(p.Ser481Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000108 in 1,613,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. S481S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00011 (0 hom.)
• Consequence: SNTA1 NM_003098.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: 3.49
• Publications: 1 publications found

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

ENSG00000288878 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -4 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.793
• BP6: Variant 20-33408583-G-A is Benign according to our data. Variant chr20-33408583-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 188145.
• BS2: High AC in GnomAd4 at 10 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003098.3. 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
	SNTA1	NM_003098.3	MANE Select	c.1442C>T	p.Ser481Leu	missense	Exon 8 of 8	NP_003089.1	Q13424-1
	SNTA1	NM_001424413.1		c.1439C>T	p.Ser480Leu	missense	Exon 8 of 8	NP_001411342.1
	SNTA1	NM_001424414.1		c.1474C>T	p.Arg492Cys	missense	Exon 8 of 8	NP_001411343.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNTA1	ENST00000217381.3	TSL:1 MANE Select	c.1442C>T	p.Ser481Leu	missense	Exon 8 of 8	ENSP00000217381.2	Q13424-1
	SNTA1	ENST00000953204.1		c.1565C>T	p.Ser522Leu	missense	Exon 9 of 9	ENSP00000623263.1
	SNTA1	ENST00000953205.1		c.1511C>T	p.Ser504Leu	missense	Exon 9 of 9	ENSP00000623264.1

Frequencies

GnomAD3 genomes AF: 0.0000657 AC: 10 AN: 152182 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000965

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.0000735

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000398 AC: 10 AN: 251446 AF XY: 0.0000368

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000703

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000113 AC: 165 AN: 1461768 Hom.: 0 Cov.: 30 AF XY: 0.0000963 AC XY: 70 AN XY: 727200

African (AFR) AF: 0.0000597 AC: 2 AN: 33480

American (AMR) AF: 0.0000447 AC: 2 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86246

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000140 AC: 156 AN: 1111900

Other (OTH) AF: 0.0000662 AC: 4 AN: 60396

GnomAD4 genome AF: 0.0000657 AC: 10 AN: 152182 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74326

African (AFR) AF: 0.0000965 AC: 4 AN: 41452

American (AMR) AF: 0.0000655 AC: 1 AN: 15274

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

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

European-Non Finnish (NFE) AF: 0.0000735 AC: 5 AN: 68032

Other (OTH) AF: 0.00 AC: 0 AN: 2086

Alfa AF: 0.0000893 Hom.: 0

Bravo AF: 0.0000491

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.00 AC: 0

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000247 AC: 3

EpiCase AF: 0.000273

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Cardiovascular phenotype (1)
-	1	-	Long QT syndrome (1)
-	1	-	Long QT syndrome 12 (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Benign	-0.047	T
BayesDel_noAF	Benign	-0.11
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.60	D
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Benign	0.080	D
MetaRNN	Pathogenic	0.79	D
MetaSVM	Uncertain	0.54	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		3.5
PrimateAI	Uncertain	0.67	T
PROVEAN	Uncertain	-3.7	D
REVEL	Uncertain	0.54
Sift	Uncertain	0.013	D
Sift4G	Uncertain	0.022	D
Polyphen		1.0	D
Vest4		0.67
MVP		0.89
MPC		0.25
ClinPred		0.71	D
GERP RS		4.7
Varity_R		0.36
gMVP		0.57
Mutation Taster		=68/32	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs370531842; hg19: chr20-31996389;