ClinVar Miner

Submissions for variant NM_000384.3(APOB):c.10579C>T (p.Arg3527Trp) (rs144467873)

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Total submissions: 10
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV000627798 SCV000284754 pathogenic Hypercholesterolemia, autosomal dominant, type B; Hypobetalipoproteinemia, familial, 1 2018-11-14 criteria provided, single submitter clinical testing This sequence change replaces arginine with tryptophan at codon 3527 of the APOB protein (p.Arg3527Trp). The arginine residue is moderately conserved and there is a moderate physicochemical difference between arginine and tryptophan. This variant is present in population databases (rs144467873, ExAC 0.1%). This variant has been reported in individuals and families affected with hyperlipidemia and apolipoprotein B deficiency (PMID: 7627691, 9191540, 9702952, 22294733, 21376320, 16250003, 11238294). This variant is a common cause of hyperlipidemia in individuals of East Asian ancestry (PMID: 9702952, 27206935), but has also been reported in individuals of other ancestries (PMID: 23936638, 16250003, 23375686, 26415676) This variant is also known as R3500W in the literature. Experimental studies have shown that this sequence change has been shown to affect protein function (PMID: 11238294, 10388479). In addition,  A different missense substitution at this codon (p.Arg3527Gln) is reported to be deleterious (PMID: 24234650, 2563166). This indicates that the arginine residue is important for APOB protein function. In summary, this missense variant has been reported in affected individuals and affects a residue which is important for APOB protein function. For these reasons it has been classified as Pathogenic.
Robarts Research Institute,Western University RCV000408839 SCV000484822 pathogenic Familial hypercholesterolemia 2019-08-22 criteria provided, single submitter clinical testing
GeneDx RCV000494148 SCV000583115 pathogenic not provided 2018-06-07 criteria provided, single submitter clinical testing The R3527W variant in the APOB gene has been reported previously in association with hypercholesterolemia using alternate nomenclature, R3500W (Gaffney et al., 1995; Tai et al., 1998; Fisher et al., 1999). The R3527W variant is observed in 11/8642 (0.1%) alleles from individuals of East Asian background in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R3527W variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved in mammals. Functional studies demonstrated the R3500W variant reduced APOB capacity for binding, uptake and degradation of LDL (Fisher et al., 1999). Furthermore, a different missense variant affecting the same residue (R3527Q) has been reported in the Human Gene Mutation Database in association with an APOB-related disorder (Stenson et al., 2014), supporting the functional importance of this region of the protein. We interpret R3527W as a pathogenic variant.
Fundacion Hipercolesterolemia Familiar RCV000408839 SCV000607383 uncertain significance Familial hypercholesterolemia 2016-03-01 criteria provided, single submitter research
Laboratory for Molecular Medicine,Partners HealthCare Personalized Medicine RCV000844613 SCV000712357 pathogenic Familial hypercholesterolemia - homozygous 2017-07-10 criteria provided, single submitter clinical testing The p.Arg3527Trp variant (also referred to in the literature as p.Arg3500Trp) in APOB has been reported in at least 33 individuals with familial hypercholestero lemia, the majority of whom are of East Asian ancestry, and segregated with dise ase in at least 15 affected relatives from 4 families (Gaffney 1995, Choong 1997 , Tai 1998, Fisher 1999, Tai 2001, Yang 2007, Hollandt 2012, Chiou 2010, Chiou 2 011, Chiou 2012, Bertolini 2013). This variant has been reported in ClinVar (Var iation ID 40223) and has also been identified in 22/18848 East Asian chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; d bSNP rs144467873). This frequency is low enough to be consistent with the freque ncy of familial hypercholesterolemia (FH) in the general population. In vitro fu nctional studies provide some evidence that the p.Arg3527Trp variant may impact protein function (Gaffney 1995, Fisher 1999, Tai 2001). Additionally, another va riant at this position, p.Arg3527Gln, is a well-established pathogenic variant f or FH. In summary, this variant meets criteria to be classified as pathogenic fo r FH in an autosomal dominant manner based upon segregation studies, increased p revalence in affected individuals, and pathogenicity of other variants at this p osition. Please note that pathogenic variants in APOB can have reduced penetranc e and a less severe phenotype than disease-causing LDLR or PCSK9 variants (Young blom and Knowles, GeneReviews). ACMG/AMP Criteria applied: PS4; PP1_Strong; PM5; PS3_Supporting.
Illumina Clinical Services Laboratory,Illumina RCV000231844 SCV000914259 pathogenic Hypercholesterolemia, autosomal dominant, type B 2019-04-05 criteria provided, single submitter clinical testing Across a selection of the available literature, the APOB c.10579C>T (p.Arg3527Trp) missense variant, previously reported in the literature as p.Arg3500Trp, has been identified in a heterozygous state in at least 33 individuals with familial hypercholesterolemia, 15 of whom were unrelated (Gaffney et al. 1995; Choong et al. 1997; Tai et al. 1998; Fisher et al. 1999). The p.Arg3527Trp variant was absent from 309 controls and is reported at a frequency of 0.001273 in the East Asian population of the Exome Aggregation Consortium. Arg3527 is located in the LDL receptor-binding domain of the APOB protein. Fisher et al. (1999) demonstrated in human skin fibroblast cells that the p.Arg3527Trp variant protein had lower rates of binding, internalization, and degradation of LDL than wild type levels. Based on the evidence, the p.Arg3527Trp variant is classified as pathogenic for familial hypercholesterolemia. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population.
Integrated Genetics/Laboratory Corporation of America RCV000780859 SCV000918477 pathogenic Familial hypercholesterolemias 2018-07-31 criteria provided, single submitter clinical testing Variant summary: APOB c.10579C>T (p.Arg3527Trp also known as R3500W) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00014 in 276418 control chromosomes (gnomAD). c.10579C>T has been reported in the literature in multiple individuals affected with Familial Hypercholesterolemia (Chiou_2012, Wald_2016). These data indicate that the variant is very likely to be associated with disease. Five ClinVar submissions from other clinical diagnostic laboratories (evaluation after 2014) cite the variant as "pathogenic" (4x) and once as "uncertain significance." Based on the evidence outlined above, the variant was classified as pathogenic.
GeneReviews RCV000231844 SCV000490149 pathogenic Hypercholesterolemia, autosomal dominant, type B 2016-12-08 no assertion criteria provided literature only
Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde,Academisch Medisch Centrum RCV000408839 SCV000605967 pathogenic Familial hypercholesterolemia no assertion criteria provided research
Molecular Genetics Laboratory,BC Children's and BC Women's Hospitals RCV000494148 SCV000803730 pathogenic not provided 2018-05-03 no assertion criteria provided clinical testing

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