NM_014000.3:c.2969C>T
Variant summary
Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2
The NM_014000.3(VCL):c.2969C>T(p.Ala990Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000292 in 1,613,554 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 Uncertain significance (★★).
Frequency
Consequence
NM_014000.3 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_benign. Variant got -5 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.000171 AC: 26AN: 152088Hom.: 0 Cov.: 30
GnomAD3 exomes AF: 0.000303 AC: 76AN: 251016Hom.: 0 AF XY: 0.000265 AC XY: 36AN XY: 135652
GnomAD4 exome AF: 0.000304 AC: 445AN: 1461466Hom.: 0 Cov.: 36 AF XY: 0.000279 AC XY: 203AN XY: 727040
GnomAD4 genome AF: 0.000171 AC: 26AN: 152088Hom.: 0 Cov.: 30 AF XY: 0.000175 AC XY: 13AN XY: 74276
ClinVar
Submissions by phenotype
Dilated cardiomyopathy 1W Uncertain:3
Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as VUS-3B. Following criteria are met: 0105 - The mechanism of disease for this gene is not clearly established. However, null variants have been reported in patients and therefore loss-of-function is speculated (PMID: 32516855). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance. Asymptomatic carriers have been reported in families with null variants (PMID: 32516855). (I) 0200 - Variant is predicted to result in a missense amino acid change from alanine to alaine. (I) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v2) <0.001 for a dominant condition (82 heterozygotes, 0 homozygotes). (SP) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. (I) 0600 - Variant is located in the annotated C-terminal tail region (UniProt). (I) 0705 - No comparable missense variants have previous evidence for pathogenicity. (I) 0809 - Previous evidence of pathogenicity for this variant is inconclusive. This variant has been classified multiple times as a VUS (ClinVar; PMIDs: 25332820, 24503780, 30847666, 33302605). (I) 1007 - No published functional evidence has been identified for this variant. (I) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -
This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 990 of the VCL protein (p.Ala990Val). This variant is present in population databases (rs150595117, gnomAD 0.06%), and has an allele count higher than expected for a pathogenic variant. This missense change has been observed in individual(s) with clinical features of VCL-related conditions (PMID: 24503780, 25332820, 30847666, 31737537). ClinVar contains an entry for this variant (Variation ID: 45603). 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. -
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. -
not provided Uncertain:3
BS1 -
The variant has been seen in one patient with idiopathic DCM at our center. Testing was performed at Invitae. Given the weak case data, weak segregation data, and higher frequency in population databases than expected, we consider this variant a variant of uncertain significance and we do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). The variant has been seen in 1 case of DCM and 1 case of chemotherapy-induced cardiomyopathy (aACM). The patient with DCM had a different likely pathogenic variant. There is weak case data. There is weak segregation data provided in the chemotherapy-induced cardiomyopathy family. Pugh et al (2014) reported this variant in a 2yo with DCM. The patient also harbored a truncating variant in TTN, which was called likely pathogenic (by LMM at time of publication). Wasielewski et al (2014) reported the variant in a patient with anthracycline-associated cardiomyopathy. The text of the paper reports that it segregates with disease in the family, but the pedigree provided is only a two generation pedigree and the only relatives tested were four sisters. The sisters had either aACM, DCM or SCICD. In silico analyses do not agree on the potential impact of this variant on protein function. It should be noted that all of the disease-causing variants in ClinVar are loss of function variants. However, the ExAC variation constraints do show that the VCL gene has fewer missense variants than would be expected by chance. The variant is present in 83 of 138,352 individuals listed in the Genome Aggregation Consortium Dataset (gnomAD; http://gnomad.broadinstitute.org/), which currently includes variant calls on >140,000 unrelated individuals of African, Asian, European, Latino, and Ashkenazi descent. Specifically, the variant has been seen in 72 of 63,142 European (Non-finnish individuals) (MAF = 0.057%), 7 of 12,869 Finnish individuals (MAF - 0.027%) The average coverage at that site in gnomAD is 84x for exomes and 30x for genomes. -
Reported in association with cardiomyopathy; however, several patients also harbor additional potentially disaese-causing cardiogenetic variants and this variant did not segregate with disease in several affected members of one family (PMID: 24503780, 25332820, 30847666, 31737537, 33302605); Identified in a cohort of stillbirth cases (PMID: 30615648); 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: 33302605, 31737537, 30847666, 25332820, 24503780, 30615648) -
not specified Uncertain:2
The Ala990Val variant in VCL has been identified in 4/8600 European American chr omosomes from a broad population by the NHLBI Exome Sequencing Project (http://e vs.gs.washington.edu/EVS, dbSNP rs150595117). Computational analyses (biochemica l amino acid properties, conservation, AlignGVGD, PolyPhen2, and SIFT) do not pr ovide strong support for or against an impact to the protein. Additional informa tion is needed to fully assess the clinical significance of this variant. -
Variant summary: VCL c.2969C>T (p.Ala990Val) results in a non-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 0.0003 in 251016 control chromosomes. The observed variant frequency is approximately 12 fold of the estimated maximal expected allele frequency for a pathogenic variant in VCL causing Cardiomyopathy phenotype (2.5e-05). c.2969C>T has been reported in the literature in individuals affected with Cardiomyopathy (Pugh_2014, Wasielewski_2014, vanLint_2019). These report(s) do not provide unequivocal conclusions about association of the variant with Cardiomyopathy. Co-occurrences with other pathogenic variant(s) have been reported (Pugh_2014, TTN c.39078C>A, p.Tyr13026X), providing supporting evidence for a benign role. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 24503780, 25332820, 30847666). ClinVar contains an entry for this variant (Variation ID: 45603). Based on the evidence outlined above, the variant was classified as uncertain significance. -
Cardiomyopathy Uncertain:1
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Dilated cardiomyopathy 1W;C2750459:Hypertrophic cardiomyopathy 15 Uncertain:1
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Cardiovascular phenotype Uncertain:1
The c.2969C>T (p.A990V) alteration is located in exon 20 (coding exon 20) of the VCL gene. This alteration results from a C to T substitution at nucleotide position 2969, causing the alanine (A) at amino acid position 990 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at