rs116888866
Variant summary
Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2
The NM_004415.4(DSP):c.7916G>A(p.Arg2639Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000535 in 1,614,136 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Consequence
NM_004415.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Benign. Variant got -13 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
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DSP | NM_004415.4 | c.7916G>A | p.Arg2639Gln | missense_variant | Exon 24 of 24 | ENST00000379802.8 | NP_004406.2 | |
DSP | NM_001319034.2 | c.6587G>A | p.Arg2196Gln | missense_variant | Exon 24 of 24 | NP_001305963.1 | ||
DSP | NM_001008844.3 | c.6119G>A | p.Arg2040Gln | missense_variant | Exon 24 of 24 | NP_001008844.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
DSP | ENST00000379802.8 | c.7916G>A | p.Arg2639Gln | missense_variant | Exon 24 of 24 | 1 | NM_004415.4 | ENSP00000369129.3 | ||
DSP | ENST00000418664.2 | c.6119G>A | p.Arg2040Gln | missense_variant | Exon 24 of 24 | 1 | ENSP00000396591.2 | |||
DSP | ENST00000710359.1 | c.6587G>A | p.Arg2196Gln | missense_variant | Exon 24 of 24 | ENSP00000518230.1 |
Frequencies
GnomAD3 genomes AF: 0.000500 AC: 76AN: 152150Hom.: 1 Cov.: 32
GnomAD3 exomes AF: 0.000893 AC: 224AN: 250880Hom.: 0 AF XY: 0.000862 AC XY: 117AN XY: 135656
GnomAD4 exome AF: 0.000538 AC: 787AN: 1461868Hom.: 7 Cov.: 36 AF XY: 0.000524 AC XY: 381AN XY: 727228
GnomAD4 genome AF: 0.000499 AC: 76AN: 152268Hom.: 1 Cov.: 32 AF XY: 0.000645 AC XY: 48AN XY: 74438
ClinVar
Submissions by phenotype
not specified Uncertain:1Benign:5
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Arg2639Gln in exon 24 of DSP: This variant is not expected to have clinical sign ificance because it has been identified in 1.2% (105/8630) of East Asian chromos omes by the by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitut e.org). In one study this variant has been identified in 4 Taiwanese individuals with ARVC, but was also identified in 1.3% (8/600) control chromosomes (Bao 201 3). -
Note this variant was found in clinical genetic testing performed by one or more labs who may also submit to ClinVar. Thus any internal case data may overlap with the internal case data of other labs. The interpretation reviewed below is that of the Stanford Center for Inherited Cardiovascular Disease. We consider this a variant of uncertain significance, probably benign, based on the weak case data, the mismatch with the phenotype, and that the variant is common in Asians. The variant has been seen in one Taiwanese patient with ARVC (Yu et al 2008) and one Chinese patient with ARVC (Bao et al 2013). However, it is also seen in Asian controls (reviewed below). In silico analysis predicts the variant to be probably damaging. The arginine at codon 2639 is conserved across species. The GeneDx report notes that another variant of uncertain significance has been reported in association with ARVC at this codon (p.Arg2639Trp), but that no other nearby variants are listed in HGMD. There are no nearby variants listed in www.arvcdatabase.info. In total the variant has been seen in 30 of 7179 published controls and individuals from publicly available population datasets, with ~5% of Asians in two different samples having the variant. There is no variation at codon 2639 listed in the NHLBI Exome Sequencing Project dataset, which currently includes variant calls on ~6500 Caucasian and African American individuals (as of April 23rd, 2014). Note that this dataset does not match the patient's ancestry (Japanese). Per the GeneDx report, the variant was observed in 14 of 279 Asian individuals in the 1000 genomes sample and 16 of 300 Chinese individuals studied by Bao et al (2013). The variant was not observed in 100 Tawainese individuals studied by Yu et al (2008). -
Variant summary: DSP c.7916G>A (p.Arg2639Gln) results in a conservative amino acid change located in a plectin repeat (IPR001101) of the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00092 in 252300 control chromosomes, predominantly at a frequency of 0.011 within the East Asian subpopulation in the gnomAD database. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 1100-fold of the estimated maximal expected allele frequency for a pathogenic variant in DSP causing Arrhythmia phenotype (1e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian origin. c.7916G>A has been reported in the literature in East Asian individuals affected with Arrhythmia (Yu_2008, Bao_2013, Sato_2015, Zhao_2016), but it was also found in several controls (Bao_2013). These reports do not provide unequivocal conclusions about association of the variant with Arrhythmia. At least one publication reports experimental evidence evaluating an impact on protein function, and demonstrated a weak impact on the binding of the DSP C-terminus to the tested intermediate filaments (IF) proteins (Favre_2018). Nine other clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Based on the evidence outlined above, the variant was classified as benign. -
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Arrhythmogenic right ventricular dysplasia 8 Uncertain:1Benign:1
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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
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Cardiomyopathy Benign:2
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Arrhythmogenic cardiomyopathy with wooly hair and keratoderma Benign:2
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Long QT syndrome Uncertain:1
Criteria: PP3, BS1 -
Primary familial hypertrophic cardiomyopathy Uncertain:1
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Arrhythmogenic right ventricular dysplasia 8;C1854063:Arrhythmogenic cardiomyopathy with wooly hair and keratoderma Benign:1
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Arrhythmogenic right ventricular cardiomyopathy Benign:1
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Lethal acantholytic epidermolysis bullosa Benign:1
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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
not provided Benign:1
This variant is associated with the following publications: (PMID: 25693453, 20400443, 26585738, 24125834, 23911551, 20981092, 26332594, 18632414, 28471438, 32344918, 31402444) -
Woolly hair-skin fragility syndrome Benign:1
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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Cardiovascular phenotype Benign:1
This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
DSP-related disorder Benign:1
This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at