rs201421292
Positions:
Variant summary
Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2
The NM_003098.3(SNTA1):āc.375G>Cā(p.Gln125His) variant causes a missense change. The variant allele was found at a frequency of 0.00000248 in 1,614,068 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (ā ā ).
Frequency
Genomes: š 0.0000066 ( 0 hom., cov: 33)
Exomes š: 0.0000021 ( 0 hom. )
Consequence
SNTA1
NM_003098.3 missense
NM_003098.3 missense
Scores
2
11
6
Clinical Significance
Conservation
PhyloP100: 3.84
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]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 2 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SNTA1 | NM_003098.3 | c.375G>C | p.Gln125His | missense_variant | 2/8 | ENST00000217381.3 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SNTA1 | ENST00000217381.3 | c.375G>C | p.Gln125His | missense_variant | 2/8 | 1 | NM_003098.3 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000657 AC: 1AN: 152208Hom.: 0 Cov.: 33
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251496Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135922
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GnomAD4 exome AF: 0.00000205 AC: 3AN: 1461860Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2AN XY: 727240
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GnomAD4 genome ? AF: 0.00000657 AC: 1AN: 152208Hom.: 0 Cov.: 33 AF XY: 0.0000135 AC XY: 1AN XY: 74346
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:5
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Long QT syndrome 12 Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Jan 13, 2018 | This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Center For Human Genetics And Laboratory Diagnostics, Dr. Klein, Dr. Rost And Colleagues | May 15, 2017 | - - |
not provided Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Oct 01, 2019 | Identified in association with LQTS in published literature (Marschall et al., 2019); Not observed at a significant frequency in large population cohorts (Lek et al., 2016); Reported as a variant of uncertain significance in ClinVar (ClinVar Variant ID# 191512; Landrum et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 31737537) - |
Uncertain significance, criteria provided, single submitter | research | Biesecker Lab/Clinical Genomics Section, National Institutes of Health | Jun 24, 2013 | - - |
Long QT syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Nov 29, 2019 | 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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SNTA1-related conditions. ClinVar contains an entry for this variant (Variation ID: 191512). This variant is present in population databases (rs201421292, ExAC 0.001%). This sequence change replaces glutamine with histidine at codon 125 of the SNTA1 protein (p.Gln125His). The glutamine residue is highly conserved and there is a small physicochemical difference between glutamine and histidine. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
BayesDel_addAF
Uncertain
T
BayesDel_noAF
Benign
CADD
Benign
DANN
Uncertain
DEOGEN2
Uncertain
T
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
LIST_S2
Pathogenic
D
M_CAP
Benign
D
MetaRNN
Uncertain
D
MetaSVM
Benign
T
MutationAssessor
Benign
L
MutationTaster
Benign
D
PrimateAI
Pathogenic
D
PROVEAN
Uncertain
D
REVEL
Benign
Sift
Uncertain
D
Sift4G
Uncertain
D
Polyphen
P
Vest4
MutPred
Gain of catalytic residue at D124 (P = 0.0953);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at