rs199473258
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP2PP3
The NM_001099404.2(SCN5A):c.4459A>C(p.Met1487Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000805 in 1,613,930 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).
Frequency
Genomes: 𝑓 0.000046 ( 0 hom., cov: 31)
Exomes 𝑓: 0.0000041 ( 0 hom. )
Consequence
SCN5A
NM_001099404.2 missense
NM_001099404.2 missense
Scores
9
5
4
Clinical Significance
Conservation
PhyloP100: 7.97
Genes affected
SCN5A (HGNC:10593): (sodium voltage-gated channel alpha subunit 5) The protein encoded by this gene is an integral membrane protein and tetrodotoxin-resistant voltage-gated sodium channel subunit. This protein is found primarily in cardiac muscle and is responsible for the initial upstroke of the action potential in an electrocardiogram. Defects in this gene have been associated with long QT syndrome type 3 (LQT3), atrial fibrillation, cardiomyopathy, and Brugada syndrome 1, all autosomal dominant cardiac diseases. Alternative splicing results in several transcript variants encoding different isoforms. [provided by RefSeq, May 2022]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM1
?
In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 9 uncertain in NM_001099404.2
PM2
?
Very rare variant in population databases, with high coverage;
PP2
?
Missense variant where missense usually causes diseases, SCN5A
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.759
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
SCN5A | NM_001099404.2 | c.4459A>C | p.Met1487Leu | missense_variant | 26/28 | ENST00000413689.6 | |
SCN5A | NM_000335.5 | c.4456A>C | p.Met1486Leu | missense_variant | 26/28 | ENST00000423572.7 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
SCN5A | ENST00000413689.6 | c.4459A>C | p.Met1487Leu | missense_variant | 26/28 | 5 | NM_001099404.2 | P4 | |
SCN5A | ENST00000423572.7 | c.4456A>C | p.Met1486Leu | missense_variant | 26/28 | 1 | NM_000335.5 | A1 |
Frequencies
GnomAD3 genomes ? AF: 0.0000460 AC: 7AN: 152106Hom.: 0 Cov.: 31
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GnomAD3 exomes AF: 0.00000398 AC: 1AN: 251464Hom.: 0 AF XY: 0.00000736 AC XY: 1AN XY: 135910
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GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461824Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3AN XY: 727224
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:1Uncertain:5Other:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
not provided Pathogenic:1Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | AiLife Diagnostics, AiLife Diagnostics | Jul 23, 2021 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Sep 22, 2022 | Identified in a patient referred for long QT syndrome testing, however, no clinical information was provided (Kapplinger et al., 2009); Identified in two cases with sudden unexpected death, however, detailed clinical and segregation information was not available (Wang et al., 2014; Lin et al., 2017); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 32569262, 22581653, 30669290, 29247119, 24631775, 28316956, 19716085) - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Feb 22, 2023 | This sequence change replaces methionine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 1487 of the SCN5A protein (p.Met1487Leu). This variant is present in population databases (rs199473258, gnomAD 0.01%). This missense change has been observed in individual(s) with long QT syndrome and in an individual who suffered sudden unexplained death (PMID: 19716085, 29247119). ClinVar contains an entry for this variant (Variation ID: 67895). 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 tolerated. 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. - |
SUDDEN INFANT DEATH SYNDROME;C1832680:Dilated cardiomyopathy 1E;C1837845:Sick sinus syndrome 1;C1859062:Long QT syndrome 3;C1879286:Progressive familial heart block, type 1A;C2751898:Ventricular fibrillation, paroxysmal familial, type 1;C3151464:Atrial fibrillation, familial, 10;C4551804:Brugada syndrome 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Nov 03, 2021 | - - |
Cardiovascular phenotype Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 30, 2022 | The c.4459A>C (p.M1487L) alteration is located in exon 26 (coding exon 25) of the SCN5A gene. This alteration results from a A to C substitution at nucleotide position 4459, causing the methionine (M) at amino acid position 1487 to be replaced by a leucine (L). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. - |
Cardiac arrhythmia Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Feb 16, 2023 | This missense variant replaces methionine with leucine at codon 1487 of the SCN5A protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in one individual referred for long QT syndrome genetic test (PMID: 19716085) and one case of sudden unexplained death (PMID: 24631775, 29247119). This variant has been identified in 3/282820 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Congenital long QT syndrome Other:1
not provided, no classification provided | literature only | Cardiovascular Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust | - | This variant has been reported as associated with Long QT syndrome in the following publications (PMID:19716085). This is a literature report, and does not necessarily reflect the clinical interpretation of the Imperial College / Royal Brompton Cardiovascular Genetics laboratory. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Uncertain
CardioboostArm
Pathogenic
CardioboostCm
Uncertain
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Uncertain
Dann
Benign
Eigen
Benign
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D;D;D;D;D;D;D;D;D
MetaSVM
Pathogenic
D
MutationTaster
Benign
D;D;D;D;D;D;D;D;D;D
PrimateAI
Pathogenic
D
PROVEAN
Uncertain
D;D;D;D;D;D;D;D;D
REVEL
Pathogenic
Sift
Uncertain
D;D;D;D;D;D;D;D;D
Sift4G
Benign
T;T;T;T;T;T;T;T;T
Polyphen
B;B;.;B;.;B;B;.;.
Vest4
MutPred
0.84
.;.;Loss of disorder (P = 0.1149);.;.;Loss of disorder (P = 0.1149);.;.;.;
MVP
MPC
0.48
ClinPred
D
GERP RS
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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