19-11102732-T-G
Variant summary
Our verdict is Pathogenic. The variant received 14 ACMG points: 14P and 0B. PS4PS3PP1_ModeratePM2PP3PP4
This summary comes from the ClinGen Evidence Repository: The NM_000527.5(LDLR):c.259T>G (p.Trp87Gly) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes (PS3, PS4, PP1_Moderate, PM2, PP3 and PP4) as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1101/2021.03.17.21252755).The supporting evidence is as follows: PS3 - Level 1/2 assays: PMID 31578082: Hmz patients' lymphocytes, FACS assays and Heterologous cells (CHO), WB, FACS and CLSM assays - results - lymphocytes: normal cell surface LDLR, 40% LDL-LDLR binding, 35% uptake; CHO: normal (100%) LDLR expression, 20% LDL-LDLR binding, 35% uptake ---- binding and uptake are below 70% of wild-type, so PS3 is Met.PS4 - Variant meets PM2. Variant identified in at least 13 unrelated index cases with Dutch Lipid Clinic score equal or above 6 from different labs.PP1_moderate - variant segregates with FH phenotype in 5 informative meiosis in 2 families from different labs.PM2 - PopMax MAF = 0.00005418 (0.0054%) in european non-finnish exomes (gnomAD v2.1.1).PP3 - REVEL = 0.892. PP4 - Variant meets PM2. Identified in 13 unrelated index cases with Dutch Lipid Clinic score equal or above 6 from different labs. LINK:https://erepo.genome.network/evrepo/ui/classification/CA023683/MONDO:0007750/013
Frequency
Consequence
NM_000527.5 missense
Scores
Clinical Significance
Conservation
Publications
- hypercholesterolemia, familial, 1Inheritance: AD, SD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, ClinGen
- homozygous familial hypercholesterolemiaInheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
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ACMG classification
Our verdict: Pathogenic. The variant received 14 ACMG points.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| LDLR | NM_000527.5 | c.259T>G | p.Trp87Gly | missense_variant | Exon 3 of 18 | ENST00000558518.6 | NP_000518.1 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| LDLR | ENST00000558518.6 | c.259T>G | p.Trp87Gly | missense_variant | Exon 3 of 18 | 1 | NM_000527.5 | ENSP00000454071.1 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152172Hom.: 0 Cov.: 31 show subpopulations
GnomAD2 exomes AF: 0.0000278 AC: 7AN: 251490 AF XY: 0.0000221 show subpopulations
GnomAD4 exome AF: 0.0000157 AC: 23AN: 1461740Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7AN XY: 727170 show subpopulations
Age Distribution
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152172Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1AN XY: 74336 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
Hypercholesterolemia, familial, 1 Pathogenic:17
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The c.259T>G (p.Trp87Gly) variant in the LDLR gene has been reported in multiple individuals with familial hypercholesterolemia (PMID: 2318961, 8054972, 8645371, 9259195, 9104431). It is located in the functionally important second LDLR type A repeat. Functional studies have demonstrated a deleterious effect of the p.Trp87Gly variant on LDL binding (PMID: 2318961, 8645371, 10735631). The variant is observed in gnomAD at a low minor allele frequency (8/282882). Multiple algorithms predicted this change to be deleterious. Therefore, the c.259T>G (p.Trp87Gly) variant in the LDLR gene is classified as pathogenic. -
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subjects mutated among 2600 FH index cases screened = 9 , family members = 7 with co-segregation / frequently associated with c.1975A>C, p.Thr659Pro (2 index cases), Subnormal LDLR activity / Software predictions: Damaging -
This variant (rs121908025) is rare (<0.1%) in a large population database (gnomAD: 8/282882 total alleles, 0.003%, no homozygotes) and has an entry in ClinVar. It has been reported in multiple individuals with familial hypercholesterolemia-1, and is considered a founder mutation in the French-Canadian population. This variant is located in the second type A repeat of the ligand binding domain of the LDLR protein. Functional studies have demonstrated a deleterious effect of p.Trp87Gly on LDL binding and uptake. This variant was also identified in the patient's father, who has a personal history of elevated cholesterol. We consider c.259T>G to be pathogenic. -
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PS4, PM2_Supporting, PP3, PM1, PS3_Moderate -
The NM_000527.5(LDLR):c.259T>G (p.Trp87Gly) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes (PS3, PS4, PP1_Moderate, PM2, PP3 and PP4) as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1101/2021.03.17.21252755). The supporting evidence is as follows: PS3 - Level 1/2 assays: PMID 31578082: Hmz patients' lymphocytes, FACS assays and Heterologous cells (CHO), WB, FACS and CLSM assays - results - lymphocytes: normal cell surface LDLR, 40% LDL-LDLR binding, 35% uptake; CHO: normal (100%) LDLR expression, 20% LDL-LDLR binding, 35% uptake ---- binding and uptake are below 70% of wild-type, so PS3 is Met. PS4 - Variant meets PM2. Variant identified in at least 13 unrelated index cases with Dutch Lipid Clinic score equal or above 6 from different labs. PP1_moderate - variant segregates with FH phenotype in 5 informative meiosis in 2 families from different labs. PM2 - PopMax MAF = 0.00005418 (0.0054%) in european non-finnish exomes (gnomAD v2.1.1). PP3 - REVEL = 0.892. PP4 - Variant meets PM2. Identified in 13 unrelated index cases with Dutch Lipid Clinic score equal or above 6 from different labs. -
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The c.259T>G (p.Trp87Gly) variant, also known as p.Trp66Gly in LDLR gene that encodes for low density lipoprotein receptor, has been identified in numerous individuals (>100) affected with familial hypercholesterolemia (FH) (PMID:9104431, 2318961, 9259195, 9272705). This variant has also been reported in homozygous status in several individuals (>20) affected with severe FH (PMID: 8098448, 2318961, 9272705). This variant is considered as a founder mutation in the French-Canadian (PMID: 9272705) and Swedish population (PMID: 33955087). Experimental studies using patient derived lymphoblasts from true homozygotes revealed reduced LDLR binding and uptake (PMID: 31578082). Transfection of the mutant, p.Trp87Gly, protein in receptor deficient CHOldlA7 cells also showed significant reduction in LDL binding and uptake (PMID:31578082). Computational prediction tools suggest that the p.Trp87Gly variant may have deleterious effect on the protein function (REVEL score: 0.892). This variant is rare (24/1613912 chromosomes; 0.001487%) in the general population database, gnomAD v4.1.0 and interpreted as pathogenic by several submitters in the ClinVar database including the ClinGen variant curation expert panel (ClinVar ID: 3685). Therefore, the c.259T>G (p.Trp87Gly) variant in LDLR gene is classified as pathogenic. -
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Criteria applied: PS3,PS4,PP1_MOD,PM2_SUP,PP3,PP4 -
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not provided Pathogenic:5
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PP3, PP4, PM2_supporting, PM3, PS3_supporting, PS4 -
Observed frequently in heterozygous and homozygous states in unrelated patients from different ethnic backgrounds with FH in published literature (PMID: 2318961, 1301956, 8645371, 9259195, 9104431, 9272705, 9767373, 15528480, 16542394, 23669246, 24281370); Described as a French Canadian founder mutation and is a commonly identified variant in the European FH population (PMID: 9767373, 9272705, 16542394); Not observed at significant frequency in large population cohorts (gnomAD); Published functional studies suggest a damanging effect as LDL receptor activity was significantly reduced in the fibroblasts from two of three unrelated individuals who were homozygous for the FH French Canadian-4 allele and this variant affects either LDLR turnover or the binding of the LDLR protein to LDL (PMID: 1301956, 2318961); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Also known as FH French Canadian-4 and p.(W66G); This variant is associated with the following publications: (PMID: 28008010, 9104431, 2318961, 9259195, 8645371, 15528480, 23669246, 24281370, 9767373, 12381843, 30586733, 30512145, 29874871, 29261184, 31401775, 29407885, 31727422, 34040191, 32041611, 33303402, 32719484, 32770674, 33740630, 34037665, 33087929, 37589137, 37409534, 34363016, 33955087, 1301956, 9272705, 16542394) -
LDLR: PS4, PM2, PP1:Moderate, PP4, PS3:Supporting -
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Familial hypercholesterolemia Pathogenic:4
Variant summary: LDLR c.259T>G (p.Trp87Gly) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 2.8e-05 in 251490 control chromosomes. c.259T>G has been reported in the literature in multiple individuals affected with Familial Hypercholesterolemia (e.g. Leitersdorf_1990, Moorjani_1993, Banerjee_2019). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function, indicating the cells expressing the variant have reduced LDL-binding and uptake (e.g. Banerjee_2019). 11 clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories cited the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
The c.259T>G (p.Trp87Gly) variant in the LDLR gene has been reported in multiple individuals with familial hypercholesterolemia (PMID: 2318961, 8054972, 8645371, 9259195, 9104431). It is located in the functionally important second LDLR type A repeat. Functional studies have demonstrated a deleterious effect of the p.Trp87Gly variant on LDL binding (PMID: 2318961, 8645371, 10735631). The variant is observed in gnomAD at a low minor allele frequency (8/282882). Multiple algorithms predicted this change to be deleterious. Therefore, the c.259T>G (p.Trp87Gly) variant in the LDLR gene is classified as pathogenic. -
This missense variant replaces tryptophan with glycine at codon 87 in the second LDLR type A repeat of the ligand binding domain of the LDLR protein. This variant is also known as p.Trp66Gly in the mature protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function. Experimental functional studies have demonstrated that this variant causes reduced LDL binding, internalization and uptake (PMID: 8645371, 10735631, 31578082). This variant has been identified in over 500 individuals affected with familial hypercholesterolemia (PMID: 2318961, 8098448, 9104431, 9259195, 9272705, 9676383, 12553167, 15528480, 16542394, 23669246, 30512145, 31345425, 31578082, 33955087, 34037665, 37607748, 39407785). This variant is common in individuals of European descent and is considered a founder mutation in the French-Canadian population (PMID: 9272705) and Swedish population (PMID: 33955087). It has been shown that this variant segregates with disease in multiple affected individuals across multiple families (PMID: 37607748; ClinVar SCV001960956.1). Homozygous individuals have been shown to carry significantly higher LDL-C levels than heterozygous individuals (PMID: 8098448, 36727130). This variant has been identified in 8/282882 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on available evidence, this variant is classified as Pathogenic. -
This sequence change replaces tryptophan, which is neutral and slightly polar, with glycine, which is neutral and non-polar, at codon 87 of the LDLR protein (p.Trp87Gly). This variant is present in population databases (rs121908025, gnomAD 0.006%). This missense change has been observed in individual(s) with familial hypercholesterolemia (PMID: 2318961, 12553167, 16542394). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It is commonly reported in individuals of European ancestry (PMID: 2318961, 12553167, 16542394). Invitae Evidence Modeling of clinical and family history, age, sex, and reported ancestry of multiple individuals with this LDLR variant has been performed. This variant is expected to be pathogenic with a positive predictive value of at least 99%. This is a validated machine learning model that incorporates the clinical features of 363,995 individuals referred to our laboratory for LDLR testing. This variant is also known as p.W66G. ClinVar contains an entry for this variant (Variation ID: 3685). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt LDLR protein function with a positive predictive value of 95%. Experimental studies have shown that this missense change affects LDLR function (PMID: 8098448). For these reasons, this variant has been classified as Pathogenic. -
Homozygous familial hypercholesterolemia Pathogenic:1
The p.Trp87Gly variant in LDLR is a well-established pathogenic variant for familial hypercholesterolemia (Leitersdorf 1990, Jensen 1996, Vohl 1997, Tybjaerg-Hansen 2005, Futema 2013), and is a known founder mutation in the French Canadian population where it has been reported in >400 individuals with FH, including >15 homozygous individuals (Vohl 1997). It has also been identified in 5/66740 European chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs121908025); however, this frequency is low enough to be consistent with the frequency of FH in the general population. Additionally, in vitro functional studies provide some evidence that the p.Trp87Gly variant may impact protein function (Leitersdorf 1990). In summary, this variant meets our criteria to be classified as pathogenic for FH in an autosomal dominant manner based upon its identification in a large number of affected individuals and low frequency in controls. -
Dyslipidemia Pathogenic:1
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Cardiovascular phenotype Pathogenic:1
The p.W87G pathogenic mutation (also known as c.259T>G), located in coding exon 3 of the LDLR gene, results from a T to G substitution at nucleotide position 259. The tryptophan at codon 87 is replaced by glycine, an amino acid with highly dissimilar properties. This mutation, historically reported as W66G, has been identified in multiple individuals with familial hypercholesterolemia (FH) (Leitersdorf E et al. J. Clin. Invest., 1990 Apr;85:1014-23; Brusgaard K et al. Clin. Genet., 2006 Mar;69:277-83; Langsted A et al. Lancet Diabetes Endocrinol, 2016 Jul;4:577-87). This alteration has been reported in FH patients across ethnic groups and has been designated a founder mutation in the French Canadian and Danish populations (Vohl MC et al. Clin. Genet., 1997 Jul;52:1-6; Jensen HK et al. Atherosclerosis, 1999 Oct;146:337-44). In vitro functional studies have demonstrated that this mutation causes defects in cell surface binding of LDL (Leitersdorf E et al. J. Clin. Invest., 1990 Apr;85:1014-23; Raungaard B et al. Clin. Genet., 2000 Feb;57:110-5). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. 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