rs75025585

Variant names:

• chr20-33439020-C-A
• rs75025585
• NM_003098.3:c.317G>T

Your query was ambiguous. Multiple possible variants found:

• chr20-33439020-C-A
• chr20-33439020-C-G
• chr20-33439020-C-T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_003098.3(SNTA1):​c.317G>T​(p.Arg106Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R106W) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SNTA1 NM_003098.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.67
• Publications: 0 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

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3239573).

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.317G>T	p.Arg106Leu	missense	Exon 2 of 8	NP_003089.1
	SNTA1	NM_001424413.1		c.317G>T	p.Arg106Leu	missense	Exon 2 of 8	NP_001411342.1
	SNTA1	NM_001424414.1		c.317G>T	p.Arg106Leu	missense	Exon 2 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.317G>T	p.Arg106Leu	missense	Exon 2 of 8	ENSP00000217381.2
	SNTA1	ENST00000953204.1		c.317G>T	p.Arg106Leu	missense	Exon 2 of 9	ENSP00000623263.1
	SNTA1	ENST00000953205.1		c.317G>T	p.Arg106Leu	missense	Exon 2 of 9	ENSP00000623264.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.40
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.39	T
Eigen	Benign	0.084
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.93	D
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.32	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	L
PhyloP100		1.7
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-4.1	D
REVEL	Benign	0.089
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.012	D
Polyphen		0.063	B
Vest4		0.49
MutPred		0.55		Loss of MoRF binding (P = 0.0315)
MVP		0.42
MPC		0.88
ClinPred		0.96	D
GERP RS		4.0
Varity_R		0.38
gMVP		0.40
Mutation Taster		=61/39	polymorphism

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

Other links and lift over

dbSNP: rs75025585; hg19: chr20-32026826;