19-11100236-C-G
Variant summary
Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM1PS4PM2PS3_ModeratePP3PP4PP1
This summary comes from the ClinGen Evidence Repository: NM_000527.5(LDLR):c.81C>G (p.Cys27Trp) variant is classified as pathogenic for Familial Hypercholesterolemia by applying evidence code PM1, PM2, PS3_moderate, PS4, PP1, PP3 and PP4 as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1016/j.gim.2021.09.012). The supporting evidence is as follows:PM1: Variant meets PM2 and alters Cys27, one of the cysteine residues listed.PM2: PopMax MAF = 0.00003518 (0.004%) in European (non-Finnish) exomes (gnomAD v2.1.1).PS3_moderate: PMID:1301956 - Level 2 assay- study on hmz patient's fibroblast cell, LDLR activity value range: 15-30%.PS4: Variant meets PM2. Variant identified in >15 index cases - 1 case from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation) with Simon Broome possible- 1 case from Cardiovascular Genetics Laboratory (PathWest Laboratory Medicine WA) with Dutch lipid clinic network >=6- 2 cases from Robarts Research Institute with Dutch lipid clinic network >=6- 2 cases from Research Lab of Molecular Genetics of Lipid Metabolism - Prof. M.Arca with Dutch lipid clinic network >=6-as well as >10 cases from (PMID:1301956, 9259195, 11317361, 11668627, 14974088, 16250003, 23375686, 25463123, 27497240, 27824480, 31345425) PP1: Variant segregates with FH phenotype in at least 2 informative meiosis (minimum 2) from 2 families from different labs (Research Lab of Molecular Genetics of Lipid Metabolism - Prof. M.Arca, and Laboratory of Genetics and Molecular Cardiology)PP3: REVEL = 0.759PP4: Variant meets PM2 and is identified in several index case who fulfil SB/DLCN>6/MedPed/other criteria for FH from different labs (see PS4), after alternative causes of high cholesterol were excluded. LINK:https://erepo.genome.network/evrepo/ui/classification/CA041664/MONDO:0007750/013
Frequency
Consequence
ENST00000558518.6 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 13 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
LDLR | NM_000527.5 | c.81C>G | p.Cys27Trp | missense_variant | 2/18 | ENST00000558518.6 | NP_000518.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
LDLR | ENST00000558518.6 | c.81C>G | p.Cys27Trp | missense_variant | 2/18 | 1 | NM_000527.5 | ENSP00000454071 | P3 |
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 151930Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000160 AC: 4AN: 250746Hom.: 0 AF XY: 0.0000148 AC XY: 2AN XY: 135548
GnomAD4 exome AF: 0.0000151 AC: 22AN: 1460888Hom.: 1 Cov.: 32 AF XY: 0.0000220 AC XY: 16AN XY: 726738
GnomAD4 genome AF: 0.0000197 AC: 3AN: 151930Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74178
ClinVar
Submissions by phenotype
Hypercholesterolemia, familial, 1 Pathogenic:20Benign:1
Pathogenic, reviewed by expert panel | curation | ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel | May 06, 2022 | NM_000527.5(LDLR):c.81C>G (p.Cys27Trp) variant is classified as pathogenic for Familial Hypercholesterolemia by applying evidence code PM1, PM2, PS3_moderate, PS4, PP1, PP3 and PP4 as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1016/j.gim.2021.09.012). The supporting evidence is as follows: PM1: Variant meets PM2 and alters Cys27, one of the cysteine residues listed. PM2: PopMax MAF = 0.00003518 (0.004%) in European (non-Finnish) exomes (gnomAD v2.1.1). PS3_moderate: PMID:1301956 - Level 2 assay - study on hmz patient's fibroblast cell, LDLR activity value range: 15-30%. PS4: Variant meets PM2. Variant identified in >15 index cases - 1 case from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation) with Simon Broome possible - 1 case from Cardiovascular Genetics Laboratory (PathWest Laboratory Medicine WA) with Dutch lipid clinic network >=6 - 2 cases from Robarts Research Institute with Dutch lipid clinic network >=6 - 2 cases from Research Lab of Molecular Genetics of Lipid Metabolism - Prof. M.Arca with Dutch lipid clinic network >=6 -as well as >10 cases from (PMID: 1301956, 9259195, 11317361, 11668627, 14974088, 16250003, 23375686, 25463123, 27497240, 27824480, 31345425) PP1: Variant segregates with FH phenotype in at least 2 informative meiosis (minimum 2) from 2 families from different labs (Research Lab of Molecular Genetics of Lipid Metabolism - Prof. M.Arca, and Laboratory of Genetics and Molecular Cardiology) PP3: REVEL = 0.759 PP4: Variant meets PM2 and is identified in several index case who fulfil SB/DLCN>6/MedPed/other criteria for FH from different labs (see PS4), after alternative causes of high cholesterol were excluded. - |
Pathogenic, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | Sep 16, 2024 | This missense variant replaces cysteine with tryptophan at codon 27 in the LDLR type A repeat 1 of the LDLR protein. This variant is also known as p.Cys6Trp in the mature protein, and as FH San Francisco in the literature. This variant alters a conserved cysteine residue that is critical for proper protein folding and function (PMID: 2088165, 6091915, 15952897). Computational prediction tools indicate that this variant has a deleterious impact on protein structure and function. A functional study using cells derived from a homozygous carrier individual has shown that this variant causes the mutant protein to retain 15-30% of receptor activity compared with the wild type LDLR protein (PMID: 1301956). This variant has been reported in over 60 individuals affected with familial hypercholesterolemia (PMID: 1301956, 9259195, 11317361, 11668627, 14974088, 16250003, 23375686, 25463123, 27497240, 27824480, 31345425, 33807407, 34297352, 37370883). This variant has also been observed in compound heterozygous state with a known pathogenic LDLR variant in three individuals affected with severe homozygous familial hypercholesterolemia, a phenotype expected of having two deleterious LDLR variants (PMID: 19026292, 23375686). This variant has been identified in 4/250746 chromosomes in the general population by the Genome Aggregation Database (gnomAD). A different variant affecting the same codon, c.79_81delinsCGT (p.Cys27Arg), is considered to be disease-causing (ClinVar variation ID: 921285), suggesting that cysteine at this position is important for LDLR protein function. Based on the available evidence, this variant is classified as Pathogenic. - |
Likely pathogenic, criteria provided, single submitter | literature only | LDLR-LOVD, British Heart Foundation | Mar 25, 2016 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Institute of Human Genetics, University of Leipzig Medical Center | Aug 26, 2024 | Criteria applied: PS4,PM2,PP3 - |
Pathogenic, criteria provided, single submitter | clinical testing | Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München | Jul 20, 2021 | - - |
Likely pathogenic, criteria provided, single submitter | research | Brunham Lab, Centre for Heart and Lung Innovation, University of British Columbia | Jan 21, 2019 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille | Mar 30, 2017 | ACMG Guidelines: Pathogenic (ii) - |
Pathogenic, criteria provided, single submitter | clinical testing | Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute | - | - - |
Pathogenic, criteria provided, single submitter | curation | Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard | Jan 22, 2020 | The p.Cys27Trp variant in LDLR has been reported in 54 individuals (including 47 Greek individuals) with Familial Hypercholesterolemia (PMID: 11317361, 11668627, 9259195, 1301956, 25463123, 19026292), segregated with disease in 37 affected relatives from 18 families, and has been identified in 0.003518% (4/113686) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs2228671). Please note that for diseases with clinical variability, or reduced penetrance, pathogenic variants may be present at a low frequency in the general population. This variant has also been reported pathogenic, likely pathogenic, and likely benign in ClinVar (Variation ID: 226304). In vitro functional studies provide some evidence that the p.Cys27Trp variant may slightly impact protein function (PMID: 1301956). However, these types of assays may not accurately represent biological function. Computational prediction tools and conservation analyses suggest that this variant may impact the protein, though this information is not predictive enough to determine pathogenicity. In summary, this variant meets criteria to be classified as pathogenic for Familial Hypercholesterolemia in an autosomal dominant manner based on cosegregation with Familial Hypercholesterolemia and greater prevalence in individuals with Familial Hypercholesterolemia than in control cohorts. ACMG/AMP Criteria applied: PS4, PP1_Strong, PP3, PS3_supporting (Richards 2015). - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Robarts Research Institute, Western University | - | - - |
Pathogenic, no assertion criteria provided | clinical testing | Cardiovascular Genetics Laboratory, PathWest Laboratory Medicine WA - Fiona Stanley Hospital | Apr 16, 2012 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Department of Human Genetics, Laborarztpraxis Dres. Walther, Weindel und Kollegen | Aug 06, 2018 | The mutation at the protein level at position 27 (position 6 of the mature protein) leads to the amino acid change of cysteine to tryptophan (p.Cys27Trp, old nomenclature: p.Cys6Trp). This change has already been described in the literature as a San Francisco allele and is associated with elevated cholesterol and LDL-C levels. Impairment of LDL receptor activity has been demonstrated. We observed a patient with that kind of mutation with average values of TC = 330 and LDL-C of 280 mg/dl. PMID: 1301956, 23375686, 27497240 - |
Pathogenic, criteria provided, single submitter | clinical testing | Laboratory of Medical Genetics, National & Kapodistrian University of Athens | Jun 13, 2024 | PM1, PM2, PM5, PP3, PP5- This variant has been reported in ClinVar as Pathogenic by other laboratories (Variation ID: 226304). Low frequency in gnomAD population databases. - |
Likely benign, criteria provided, single submitter | clinical testing | Centre de Génétique Moléculaire et Chromosomique, Unité de génétique de l'Obésité et des Dyslipidémies, APHP, GH Hôpitaux Universitaires Pitié-Salpêtrière / Charles-Foix | Dec 16, 2016 | subject mutated among 2600 FH index cases screened = 1 / Software predictions: Damaging - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation | Nov 05, 2016 | Disrupt disulfide bridge between Cys27 and Cys39. - |
Pathogenic, no assertion criteria provided | research | Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum | - | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Laboratory of molecular diagnosis of dyslipidemias, Università egli studi di Napoli Federico II | May 24, 2021 | - - |
Likely pathogenic, criteria provided, single submitter | research | Fundacion Hipercolesterolemia Familiar | Mar 01, 2016 | - - |
Likely pathogenic, criteria provided, single submitter | research | Laboratory of Genetics and Molecular Cardiology, University of São Paulo | Mar 01, 2016 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Aug 24, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | MGZ Medical Genetics Center | Jun 14, 2022 | - - |
not provided Pathogenic:4
Pathogenic, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Jun 30, 2020 | Predicted to have a damaging effect on the protein. One other pathogenic or likely pathogenic variant affects the same amino acid. This variant is statistically more frequent in affected individuals than in the general population and/or healthy controls. Assessment of experimental evidence suggests this variant results in abnormal protein function. - |
Pathogenic, criteria provided, single submitter | clinical testing | Clinical Genetics Laboratory, Skane University Hospital Lund | Jan 09, 2024 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Jun 01, 2024 | LDLR: PM1, PM2, PP4:Moderate, PS4:Moderate, PP3, PS3:Supporting - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Dec 23, 2021 | Also known as p.(C6W) or FH San Francisco; 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; Participates in disulfide bonding with another cysteine residue which is critical for correct protein structure, and is located in the LDL-receptor class A1 repeat domain which is necessary for ligand binding (Sudhof et al., 1985; Rudenko et al., 2002); Reported in ClinVar (ClinVar Variant ID# 226304; ClinVar); This variant is associated with the following publications: (PMID: 17539906, 19062533, 11317361, 11668627, 9259195, 27497240, 16250003, 25463123, 19026292, 14974088, 21925044, 27578104, 27765764, 27824480, 22883975, 17426749, 22836074, 24075752, 21310417, 1301956, 29284604, 19060911, 31447099, 32977124, 32041611, 32719484, 33740630, 34037665, 2988123, 12459547, 23375686) - |
Familial hypercholesterolemia Pathogenic:4
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jan 12, 2017 | Variant summary: The LDLR c.81C>G (p.Cys27Trp) variant (alternatively also known as C6W and FH San Francisco) substitutes a Cys residue located in LDL receptor class A repeat which forms ligand binding domain (InterPro, Klancar_2015, Bertolini_2013, Hobbs_1992). The ligand-binding domain contains seven or eight 40-amino acid LDLR class A (cysteine-rich) repeats, each of which contains a coordinated calcium ion and six cysteine residues involved in disulphide bond formation (InterPro, PMID: 6091915). Therefore, this variant is predicted to be deleterious for protein function as it breaks down one of the disulphide bonds. 5/5 in silico tools also predict damaging outcome for this variant. This variant was found in 2/121358 control chromosomes at a frequency of 0.0000165, which does not exceed the estimated maximal expected allele frequency of a pathogenic LDLR variant (0.0012508). In literature, this variant is widely reported as a pathogenic variant found mainly in FH patients of European origin (Klancar_2015, Mollaki_2014,Kolansky_2008, Bertolini_2013, Day_1997, Hobbs_1992). Genotype-phenotype correlation study showed that this variant causes a milder disease (Mollaki_2014). A functional study showed that this variant leads to impaired LDL receptor activity (Hobbs_1992). Multiple reputable databases classified this variant as likely pathogenic/pathogenic. Taken together, this variant is classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Mar 29, 2023 | This missense variant (also known as p.Cys6Trp in the mature protein) replaces cysteine with tryptophan at codon 27 in the LDLR type A repeat 1 of the LDLR protein. This variant alters a conserved cysteine residue that is critical for proper protein folding and function (PMID: 2088165, 6091915, 15952897). Computational prediction suggests that this variant may have a deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). A functional study performed with cells from an individual affected with homozygous familial hypercholesterolemia has indicated that the mutant protein retains 15-30% of receptor activity compared with the wild type LDLR protein (PMID: 1301956). This variant has been observed in over 60 individuals affected with familial hypercholesterolemia (PMID: 1301956, 9259195, 11317361, 11668627, 14974088, 16250003, 23375686, 25463123, 27497240, 27824480, 31345425, 33807407, 34297352). This variant has also been observed in compound heterozygous state in individuals affected with homozygous familial hypercholesterolemia, indicating that this variant contributes to disease (PMID: 19026292, 23375686). This variant has been identified in 4/250746 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on the available evidence, this variant is classified as Pathogenic. - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine | Oct 02, 2018 | This c.81C>G (p.Cys27Trp) variant in the LDLR gene has been reported in multiple unrelated individuals with familial hypercholesterolemia (PMID: 1301956, 9259195, 11317361, 11668627, 16250003, 23375686) and is extremely rare in the general population. Functional studies have reported that the mutant LDLR protein retains 15-30% of receptor activity compared with wildtype LDLR protein (PMID: 1301956). Therefore, this c.81C>G (p.Cys27Trp) variant in the LDLR gene is classified as likely pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 29, 2024 | This sequence change replaces cysteine, which is neutral and slightly polar, with tryptophan, which is neutral and slightly polar, at codon 27 of the LDLR protein (p.Cys27Trp). This variant is present in population databases (rs2228671, gnomAD 0.004%). This missense change has been observed in individuals with hypercholesterolemia (PMID: 11668627, 14974088, 19026292, 25463123, 27497240, 27824480). This variant is also known as C6W. ClinVar contains an entry for this variant (Variation ID: 226304). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt LDLR protein function with a positive predictive value of 95%. This variant affects a cysteine residue located within an LDLRA or epidermal-growth-factor (EGF)-like domains of the LDLR protein. Cysteine residues in these domains have been shown to be involved in the formation of disulfide bridges, which are critical for protein structure and stability (PMID: 7548065, 7603991, 7979249). In addition, missense substitutions within the LDLRA and EGF-like domains affecting cysteine residues are overrepresented among patients with hypercholesterolemia (PMID: 18325082). For these reasons, this variant has been classified as Pathogenic. - |
See cases Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Institute of Human Genetics, University Hospital Muenster | Dec 05, 2021 | ACMG categories: PM1,PM2,PP2,PP4,PP5,BP1 - |
Cardiovascular phenotype Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 29, 2023 | The p.C27W pathogenic mutation (also known as c.81C>G), located in coding exon 2 of the LDLR gene, results from a C to G substitution at nucleotide position 81. The cysteine at codon 27 is replaced by tryptophan, an amino acid with highly dissimilar properties. Pathogenic LDLR mutations that result in the substitution or generation of cysteine residues within the cysteine-rich LDLR class A repeats and EGF-like domains are common in familial hypercholesterolemia (FH) (Villéger L. Hum Mutat. 2002;20(2):81-7). This particular cysteine alteration has been reported in numerous familial hypercholesterolemia cohorts (e.g., Miltiadous G et al. Hum. Mutat. 2001;17:432-3; Dedoussis GV et al. Eur. J. Clin. Invest. 2004;34:402-9; Kolansky DM et al. Am. J. Cardiol. 2008;102:1438-43; Mollaki V et al. Atherosclerosis. 2014;237:798-804). Internal structural analysis indicates this alteration eliminates a disulfide bond critical for the structural integrity of LDLR class A repeat 1 (Ambry internal data). Two functional studies have indicated that this alteration leads to reduced LDLR activity, but data were not provided (Hobbs HH et al. Hum. Mutat. 1992;1:445-66; Dedoussis GV et al. Eur. J. Clin. Invest. 2004;34:402-9). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at