NM_000527.5:c.1784G>A
Variant summary
Our verdict is Pathogenic. The variant received 13 ACMG points: 13P and 0B. PS4PM5PM3PS3_SupportingPM2PP3PP4
This summary comes from the ClinGen Evidence Repository: The NM_000527.5(LDLR):c.1784G>A (p.Arg595Gln) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes (PM2, PP3, PM5, PS3_supporting, PS4, PP4, PM3) 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:PM2 - PopMax MAF = 0.0002389 (0.02389%) in European (Finnish) exomes+genomes (gnomAD v2.1.1), since this is a founder effect variant in Finnish population (PMID:11585102) we can consider PopMax MAF = 0.00005012 (0.005012%) in East Asian exomes+genomes (gnomAD v2.1.1), so PM2 is Met.PP3 - REVEL = 0.956.It is above 0.75, so PP3 is Met.PM5 - 2 other missense variants in the same codon:- NM_000527.5(LDLR):c.1783C>T (p.Arg595Trp) (ClinVar ID: 161290) - Pathogenic by these guidelines- NM_000527.5(LDLR):c.1784G>T (p.Arg595Leu) (ClinVar ID: 252029) - Likely pathogenic by these guidelinesThere is 1 variant in the same codon classified as Pathogenic by these guidelines, so PM5 is Met.PS3_supporting - Level 3 assay: PMID 11585102:Heterozygous patient cells, 125I-LDL assays - result - 70% LDL-LDLR binding, 54-49% LDL-LDLR uptake and degradation.---- functional study is consistent with damaging effect, so PS3_Supporting is Met.PS4 - Variant meets PM2 and is identified in 11 unrelated index cases: 1 index case with Simon Broome definite criteria from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation), 4 index cases with DLCN criteria for FH (LDL > 95th percentile and presence of tendon xanthomas) from Finland (PMID:11585102), 1 index case with FH criteria suggested by the Japan Atherosclerosis Society (TC > 260 mg/dL with tendon xanthomas OR TC > 260 mg/dL and TC > 260 mg/dL with tendon xanthomas in first or second degree relatives) from Japan ( PMID:18718593), 1 index case with DLCN criteria for FH (score=8) from Sweden (PMID:29974534), 1 index case with DLCN criteria for FH (score>=6) from Argentina (PMID:30270055), 2 index cases with DLCN criteria for FH (score>=6) from Russia (PMID:33418990), 1 index case with homozygous FH phenotype (LDL = 16 mmol/L) from The Netherlands (PMID:24585268), so PS4 is Met.PP4 - Variant meets PM2 and is identified in 11 unrelated index cases as described before, so PP4 is Met.PM3 - Variant meets PM2 and is identified in an index case with homozygous FH phenotype (LDL = 16 mmol/L) and LDLR variant c.(1705+1_1706-1)_(*2514_?)del (described as 16kb deletion exon 12-18) (PMID:24585268), classified as Pathogenic by these guidelines, in trans, so PM3 is Met. LINK:https://erepo.genome.network/evrepo/ui/classification/CA023585/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 13 ACMG points.
Transcripts
RefSeq
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
|---|---|---|---|---|---|---|---|---|
| LDLR | NM_000527.5 | c.1784G>A | p.Arg595Gln | missense_variant | Exon 12 of 18 | ENST00000558518.6 | NP_000518.1 |
Ensembl
| Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | TSL | MANE | Protein | Appris | UniProt |
|---|---|---|---|---|---|---|---|---|---|---|
| LDLR | ENST00000558518.6 | c.1784G>A | p.Arg595Gln | missense_variant | Exon 12 of 18 | 1 | NM_000527.5 | ENSP00000454071.1 |
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 152076Hom.: 0 Cov.: 32 show subpopulations
GnomAD2 exomes AF: 0.0000398 AC: 10AN: 251482 AF XY: 0.0000515 show subpopulations
GnomAD4 exome AF: 0.0000157 AC: 23AN: 1461852Hom.: 0 Cov.: 34 AF XY: 0.0000206 AC XY: 15AN XY: 727226 show subpopulations
Age Distribution
GnomAD4 genome AF: 0.0000197 AC: 3AN: 152194Hom.: 0 Cov.: 32 AF XY: 0.0000403 AC XY: 3AN XY: 74428 show subpopulations
Age Distribution
ClinVar
Submissions by phenotype
Hypercholesterolemia, familial, 1 Pathogenic:10Uncertain:1
This missense variant (also known as p.Arg574Gln in the mature protein and as FH-Pogosta) is located in the LDLR type B repeat 5 of the EGF precursor homology domain of the LDLR protein. Computational prediction tools and conservation analyses suggest that this variant may have deleterious impact on the protein function. An experimental study has shown that this variant causes significant defect in LDL binding, internalization and degradation in cells from a heterozygous carrier (PMID: 11585102). Another study has shown normal LDL uptake in a high throughput screening assay in vitro (PMID: 25647241). This variant has been identified in over 10 individuals affected with familial hypercholesterolemia and myocardial infarction, and reported to be a prevalent mutation in Finland (PMID: 11585102, 15359125, 15256764, 16250003, 18718593, 25437892, 25487149, 27497240). This variant has been identified in 11/282862 chromosomes in the general population by the Genome Aggregation Database (gnomAD). A different missense variant p.Arg595Trp occurring at the same codon is associated with familial hypercholesterolemia (Clinvar), suggesting that arginine at this codon is important for the protein function. Based on available evidence, this variant is classified as Likely Pathogenic. -
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The NM_000527.5(LDLR):c.1784G>A (p.Arg595Gln) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes (PM2, PP3, PM5, PS3_supporting, PS4, PP4, PM3) 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: PM2 - PopMax MAF = 0.0002389 (0.02389%) in European (Finnish) exomes+genomes (gnomAD v2.1.1), since this is a founder effect variant in Finnish population (PMID: 11585102) we can consider PopMax MAF = 0.00005012 (0.005012%) in East Asian exomes+genomes (gnomAD v2.1.1), so PM2 is Met. PP3 - REVEL = 0.956. It is above 0.75, so PP3 is Met. PM5 - 2 other missense variants in the same codon: - NM_000527.5(LDLR):c.1783C>T (p.Arg595Trp) (ClinVar ID: 161290) - Pathogenic by these guidelines - NM_000527.5(LDLR):c.1784G>T (p.Arg595Leu) (ClinVar ID: 252029) - Likely pathogenic by these guidelines There is 1 variant in the same codon classified as Pathogenic by these guidelines, so PM5 is Met. PS3_supporting - Level 3 assay: PMID 11585102: Heterozygous patient cells, 125I-LDL assays - result - 70% LDL-LDLR binding, 54-49% LDL-LDLR uptake and degradation. ---- functional study is consistent with damaging effect, so PS3_Supporting is Met. PS4 - Variant meets PM2 and is identified in 11 unrelated index cases: 1 index case with Simon Broome definite criteria from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation), 4 index cases with DLCN criteria for FH (LDL > 95th percentile and presence of tendon xanthomas) from Finland (PMID: 11585102), 1 index case with FH criteria suggested by the Japan Atherosclerosis Society (TC > 260 mg/dL with tendon xanthomas OR TC > 260 mg/dL and TC > 260 mg/dL with tendon xanthomas in first or second degree relatives) from Japan ( PMID: 18718593), 1 index case with DLCN criteria for FH (score=8) from Sweden (PMID: 29974534), 1 index case with DLCN criteria for FH (score>=6) from Argentina (PMID: 30270055), 2 index cases with DLCN criteria for FH (score>=6) from Russia (PMID: 33418990), 1 index case with homozygous FH phenotype (LDL = 16 mmol/L) from The Netherlands (PMID: 24585268), so PS4 is Met. PP4 - Variant meets PM2 and is identified in 11 unrelated index cases as described before, so PP4 is Met. PM3 - Variant meets PM2 and is identified in an index case with homozygous FH phenotype (LDL = 16 mmol/L) and LDLR variant c.(1705+1_1706-1)_(*2514_?)del (described as 16kb deletion exon 12-18) (PMID: 24585268), classified as Pathogenic by these guidelines, in trans, so PM3 is Met. -
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PM2, PP3, PM5, PS4 -
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PM2+PM5+PS3_Supporting+PS4+PM3+PP4 -
not provided Pathogenic:4Other:1
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PS4_moderate, PM1, PM2, PM3, PP3, PP4 -
DNA sequence analysis of the LDLR gene demonstrated a sequence change, c.1784G>A, in exon 12 that results in an amino acid change, p.Arg595Gln. The p.Arg595Gln change affects a highly conserved amino acid residue located in a domain of the LDLR protein that is known to be functional. The p.Arg595Gln substitution appears to be deleterious using several in-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL, CADD). This particular amino acid change has been reported in multiple individuals with familial hypercholesterolemia (Hooper et al., 2012; PMIDs: 15359125, 16250003, 15256764). Additionally, a different pathogenic sequence change affecting the same amino acid residue (p.Arg595Trp) has been described in patients with LDLR-related hypercholesterolemia (PMIDs: 25461735, 27784735). This sequence change has been described in the gnomAD database with a low population frequency of 0.004% (dbSNP rs201102492). -
The variant has been reported in individuals with familial hypercholesterolemia and one healthy control in the published literature (PMID: 27497240 (2016), 25487149 (2015), 25437892 (2014), 18718593 (2009), 16250003 (2005), 15359125 (2004), 15256764 (2004)). One functional study indicated that this variant does not have an impact on LDL uptake in vitro (PMID: 25647241 (2015)). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is disease causing and damaging. A different variant affecting the same amino acid position has been described as pathogenic. Based on the available information, the variant is predicted to be likely pathogenic. -
In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Published functional studies suggest a damaging effect as there is a reduction in LDLR binding, uptake, and degredation (Vuorio et al., 2001); This variant is associated with the following publications: (PMID: 26332594, 16250003, 9399845, 15256764, 15359125, 33740630, 34037665, 25487149, 25647241, 11585102, 18718593, 24585268, 30270055, 33418990, 29974534) -
Familial hypercholesterolemia Pathogenic:3Uncertain:1
This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 595 of the LDLR protein (p.Arg595Gln). This variant is present in population databases (rs201102492, gnomAD 0.02%). This missense change has been observed in individuals with familial hypercholesterolemia and/or myocardial infarction (PMID: 15256764, 15359125, 16250003, 18718593, 25437892, 25487149, 27497240). 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.Arg574Gln and FH-Pogosta. ClinVar contains an entry for this variant (Variation ID: 183126). 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 does not substantially affect LDLR function (PMID: 25647241). This variant disrupts the p.Arg595 amino acid residue in LDLR. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 11737238, 16250003, 20538126, 25461735, 27784735). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
This missense variant replaces arginine with glutamine at codon 595 of the LDLR protein. This variant is also known as p.Arg574Gln in the mature protein, and FH-Pogosta in the literature. This variant alters a conserved arginine residue in the LDLR type B repeat 5 of the LDLR protein (a.a. 572-615), where pathogenic missense variants are found enriched (ClinVar-LDLR). Computational prediction tools indicate that this variant has a deleterious impact on protein structure and function. An experimental study using fibroblasts derived from a heterozygous carrier individual has shown that this variant causes a significant defect in LDL binding, internalization and degradation (PMID: 11585102). Another in vitro high throughput functional study using transfected HeLa cells has shown that this variant causes normal LDL uptake (PMID: 25647241). This LDLR variant has been reported in over 10 heterozygous individuals affected with familial hypercholesterolemia (PMID: 11585102, 15256764, 15359125, 16250003, 18718593, 27497240, 28161202, 29974534, 30270055, 33418990, 37848354). This variant has also been observed in compound heterozygous state with a known pathogenic LDLR variant in one individual affected with severe homozygous familial hypercholesterolemia, a phenotype expected of having two deleterious LDLR variants (PMID: 24585268). This variant has also been reported in two individuals affected with early-onset myocardial infarction (PMID: 25487149). This variant has been identified in 11/282862 chromosomes in the general population by the Genome Aggregation Database (gnomAD). A different variant affecting the same codon, p.Arg595Trp, is considered to be disease-causing (ClinVar variation ID: 183126), suggesting that arginine at this position is important for LDLR protein function. Based on the available evidence, this variant is classified as Pathogenic. -
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Variant summary: LDLR c.1784G>A (p.Arg595Gln) results in a conservative amino acid change in the encoded protein sequence. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change. The variant allele was found at a frequency of 4e-05 in 251482 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in LDLR causing Familial Hypercholesterolemia (4e-05 vs 0.0013), allowing no conclusion about variant significance. c.1784G>A has been observed in multiple compound heterozygous and heterozygous individuals affected with Familial Hypercholesterolemia (example: Kim_2004, Hooper_2012, Meshkov_2021, and Du_2022). These data indicate that the variant is very likely to be associated with disease. A different variant affecting the same codon has been classified as likely pathogenic/pathogenic by our lab (c.1783C>T, p.Arg595Trp), supporting the critical relevance of codon 595 to LDLR protein function. The following publications have been ascertained in the context of this evaluation (PMID: 36325061, 15359125, 33418990, 22883975). ClinVar contains an entry for this variant (Variation ID: 183126). Based on the evidence outlined above, the variant was classified as pathogenic. -
Dyslipidemia Pathogenic:1
PS4, PP1_strong, PM2, PM5, PP3, PP5 -
Cardiovascular phenotype Pathogenic:1
The p.R595Q pathogenic mutation (also known as c.1784G>A), located in coding exon 12 of the LDLR gene, results from a G to A substitution at nucleotide position 1784. The arginine at codon 595 is replaced by glutamine, an amino acid with highly similar properties. This variant, which is also known as p.R574Q, was reported in multiple individuals with features consistent with familial hypercholesterolemia (FH) (Kim JH et al. Mol Cells, 2004 Aug;18:63-70; Fouchier SW et al. Hum Mutat, 2005 Dec;26:550-6; Miyake Y et al. Atherosclerosis, 2009 Mar;203:153-60; Hooper AJ et al. Atherosclerosis, 2012 Oct;224:430-4; Minicocci I et al. J Pediatr, 2017 Apr;183:100-107.e3; Corral P et al. Atherosclerosis, 2018 Oct;277:256-261; Maurer F et al. Swiss Med Wkly, 2016 Aug;146:w14326; Junna N et al. Atherosclerosis, 2023 Dec;386:117327). This variant has been identified in conjunction with other LDLR variant(s) in individual(s) who met clinical criteria for homozygous FH (Sjouke B et al. Eur. Heart J., 2015 Mar;36:560-5). In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the supporting evidence, this variant is interpreted as a disease-causing mutation. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at