rs749038326
Variant summary
Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PP1_ModeratePM2PP4PS3_ModeratePM5_StrongPS4_Moderate
This summary comes from the ClinGen Evidence Repository: The NM_000527.5(LDLR):c.268G>A (p.Asp90Asn) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes PM5_Strong, PM2, PP1_Moderate, PS3_Moderate, PS4_Moderate 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: PM5_strong - there are 4 other missense variants is the same codon:- NM_000527.5(LDLR):c.268G>T (p.Asp90Tyr) - classified as Likely pathogenic by the FH VCEP, with these guidelines- NM_000527.5(LDLR):c.269A>C (p.Asp90Ala) - Likely pathogenic by these guidelines- NM_000527.5(LDLR):c.269A>G (p.Asp90Gly) - Pathogenic by these guidelines- NM_000527.5(LDLR):c.270T>A (p.Asp90Glu) - Pathogenic by these guidelines--- There are 2 variants classified as Pathogenic, so PM5_Strong is met.PP1_moderate - Variant segregates with phenotype in 4 informative meiosis from different labs: - 1 unaffected family member does not have the variant, from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation);- 3 informative meiosis from 1 family from PMID 12837857 (Chang et al. 2003): 1 relative has the variant and phenotype (III:1), plus 2 relatives do not have the variant and do not have the phenotype (II:1 and III:2)4 informative meiosis, so PP1_Moderate is met.PM2 - PopMax MAF = 0.0008019 (0.08019%) in East Asian (gnomAD v2.1.1), but this is a founder variant in East Asian populations, so PM2 can be met in this instance.PS3_moderate - Level 2 FS: Chang et al., 2003 (PMID:12837857): Heterologous cells (COS-7), FACS assays - results: 55% LDLR cell surface and uptake. Binding is not studied, so not all cycle is studied (level 2 and not level 1)---- functional study is consistent with damaging effect, activity is below 70% of wild-type, so PS3_Moderate is met.PS4_moderate - variant meets PM2 and was identified in:- 1 index case who fulfills Simon Broome criteria of possible FH from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation), Czech Republic;- 3 unrelated index cases, all with Dutch lipid clinic network >=6, from Robarts Research Institute, Canada;- at least 1 index case with DLCN score of definite FH from U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille (SCV000583645.1 in ClinVar), France;- 1 index case who fulfills SB criteria of at least possible FH from PMID 9259195 (Day et al., 1997), UK;- 1 index case who fulfills SB criteria of at least possible FH from PMID 25962062 (Han et al., 2015), Korea;- 2 unrelated index cases who fulfill SB criteria of possible FH (TC>8mmol/L, plus CAD) from PMID 12837857 (Chang et al., 2003), Taiwan, China;9 cases, so PS4_Moderate is met.PP4 - variant meets PM2 and was identified in 9 unrelated index cases from different labs (see PS4 for details), so PP4 is met. LINK:https://erepo.genome.network/evrepo/ui/classification/CA042604/MONDO:0007750/013
Frequency
Consequence
NM_000527.5 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.268G>A | p.Asp90Asn | missense_variant | 3/18 | ENST00000558518.6 | NP_000518.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
LDLR | ENST00000558518.6 | c.268G>A | p.Asp90Asn | missense_variant | 3/18 | 1 | NM_000527.5 | ENSP00000454071 | P3 |
Frequencies
GnomAD3 genomes AF: 0.0000197 AC: 3AN: 152142Hom.: 0 Cov.: 31
GnomAD3 exomes AF: 0.0000557 AC: 14AN: 251486Hom.: 0 AF XY: 0.0000441 AC XY: 6AN XY: 135920
GnomAD4 exome AF: 0.0000198 AC: 29AN: 1461702Hom.: 0 Cov.: 31 AF XY: 0.0000193 AC XY: 14AN XY: 727160
GnomAD4 genome AF: 0.0000197 AC: 3AN: 152142Hom.: 0 Cov.: 31 AF XY: 0.0000269 AC XY: 2AN XY: 74314
ClinVar
Submissions by phenotype
Hypercholesterolemia, familial, 1 Pathogenic:11Benign:1
Pathogenic, criteria provided, single submitter | clinical testing | Revvity Omics, Revvity | Jun 28, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Victorian Clinical Genetics Services, Murdoch Childrens Research Institute | Oct 19, 2020 | Based on the classification scheme VCGS_Germline_v1.3.2, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with familial hypercholesterolemia. (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance (Gene Reviews). (I) 0200 - Variant is predicted to result in a missense amino acid change from aspartic acid to asparagine (exon 3). (I) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v2) <0.001 for a dominant condition (17 heterozygotes, 0 homozygotes). (SP) 0501 - Missense variant consistently predicted to be damaging by multiple in silico tools or highly conserved with a minor amino acid change. (SP) 0600 - Variant is located in the annotated calcium binding site of low-density lipoprotein receptor domain class A (NCBI). (I) 0701 - Other missense variants comparable to the one identified in this case have very strong previous evidence for pathogenicity. Four different variants in the same codon resulting in changes to tyrosine, alanine, glutamic acid and glycine have all been shown to cause familial hypercholesterolemia (ClinVar). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. The variant has been previously reported in patients with familial hypercholesterolemia (ClinVar, PMID: 30649024). (SP) 1002 - This variant has moderate functional evidence supporting abnormal protein function. Functional studies using COS7 cells show that this variant causes retention in the endoplasmic reticulum and reduction in LDLR activity (PMID: 12837857). (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign - |
Likely pathogenic, criteria provided, single submitter | curation;literature only | Cardiovascular Research Group, Instituto Nacional de Saude Doutor Ricardo Jorge | Mar 01, 2016 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | Jan 06, 2024 | This missense variant replaces aspartic acid with asparagine at codon 90 in the second LDLR type A of the ligand binding domain of the LDLR protein. This variant is also known as p.Asp69Asn in the mature protein. 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 has shown that the mutant protein is trapped in the endoplasmic reticulum and shows weak cell surface expression (PMID: 12837857). Cells from an individual compound heterozygous for this variant and p.Cys222* showed no detectable LDLR activity (PMID: 16343504). This variant has been reported in over thirty individuals of varying ethnicities affected with familial hypercholesterolemia (PMID: 9259195, 9763532, 12436241, 12837857, 15823276, 16250003, 16343504, 21376320, 23375686, 25962062, 27206935, 31345425) and is thought to be one of the most common pathogenic mutation in the Chinese population (PMID: 27206935, 30592178, 31686828). This variant has been reported to segregate with disease in one family (PMID: 12837857). This variant has been identified in 17/282878 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Different missense variants occurring at this codon, p.Asp90Gly and p.Asp90AGlu, are known to cause disease (ClinVar variation ID: 226313, 251107), suggesting that aspartic acid at this position is important for LDLR protein function. Based on the available evidence, this variant is classified as Pathogenic. - |
Likely pathogenic, no assertion criteria provided | research | Medical Laboratory Center, Huzhou Maternal and Child Health Hospital | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille | Mar 30, 2017 | - - |
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 , family members = 2 with co-segregation / other mutations at same codon / Software predictions: Damaging - |
Likely pathogenic, criteria provided, single submitter | literature only | LDLR-LOVD, British Heart Foundation | Mar 25, 2016 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Robarts Research Institute, Western University | - | - - |
Pathogenic, no assertion criteria provided | research | Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum | - | - - |
Pathogenic, criteria provided, single submitter | research | Brunham Lab, Centre for Heart and Lung Innovation, University of British Columbia | Jan 15, 2019 | - - |
Pathogenic, reviewed by expert panel | curation | ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel | Aug 28, 2022 | The NM_000527.5(LDLR):c.268G>A (p.Asp90Asn) variant is classified as Pathogenic for Familial Hypercholesterolemia by applying evidence codes PM5_Strong, PM2, PP1_Moderate, PS3_Moderate, PS4_Moderate 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: PM5_strong - there are 4 other missense variants is the same codon: - NM_000527.5(LDLR):c.268G>T (p.Asp90Tyr) - classified as Likely pathogenic by the FH VCEP, with these guidelines - NM_000527.5(LDLR):c.269A>C (p.Asp90Ala) - Likely pathogenic by these guidelines - NM_000527.5(LDLR):c.269A>G (p.Asp90Gly) - Pathogenic by these guidelines - NM_000527.5(LDLR):c.270T>A (p.Asp90Glu) - Pathogenic by these guidelines --- There are 2 variants classified as Pathogenic, so PM5_Strong is met. PP1_moderate - Variant segregates with phenotype in 4 informative meiosis from different labs: - 1 unaffected family member does not have the variant, from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation); - 3 informative meiosis from 1 family from PMID 12837857 (Chang et al. 2003): 1 relative has the variant and phenotype (III:1), plus 2 relatives do not have the variant and do not have the phenotype (II:1 and III:2) 4 informative meiosis, so PP1_Moderate is met. PM2 - PopMax MAF = 0.0008019 (0.08019%) in East Asian (gnomAD v2.1.1), but this is a founder variant in East Asian populations, so PM2 can be met in this instance. PS3_moderate - Level 2 FS: Chang et al., 2003 (PMID:12837857): Heterologous cells (COS-7), FACS assays - results: 55% LDLR cell surface and uptake. Binding is not studied, so not all cycle is studied (level 2 and not level 1) ---- functional study is consistent with damaging effect, activity is below 70% of wild-type, so PS3_Moderate is met. PS4_moderate - variant meets PM2 and was identified in: - 1 index case who fulfills Simon Broome criteria of possible FH from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation), Czech Republic; - 3 unrelated index cases, all with Dutch lipid clinic network >=6, from Robarts Research Institute, Canada; - at least 1 index case with DLCN score of definite FH from U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille (SCV000583645.1 in ClinVar), France; - 1 index case who fulfills SB criteria of at least possible FH from PMID 9259195 (Day et al., 1997), UK; - 1 index case who fulfills SB criteria of at least possible FH from PMID 25962062 (Han et al., 2015), Korea; - 2 unrelated index cases who fulfill SB criteria of possible FH (TC>8mmol/L, plus CAD) from PMID 12837857 (Chang et al., 2003), Taiwan, China; 9 cases, so PS4_Moderate is met. PP4 - variant meets PM2 and was identified in 9 unrelated index cases from different labs (see PS4 for details), so PP4 is met. - |
not provided Pathogenic:6
Pathogenic, no assertion criteria provided | clinical testing | Clinical Genetics, Academic Medical Center | - | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Clinical Genetics Laboratory, Skane University Hospital Lund | Nov 28, 2022 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Feb 17, 2023 | Described as one of the most frequent variants associated with FH in the Han Chinese population (Chiou and Charng, 2016); Not observed at significant frequency in large population cohorts (gnomAD); Published functional studies demonstrate reduced receptor protein on cell surface and reduced LDL binding and internalization (Chang et al., 2003); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Also known as p.(Asp69Asn); This variant is associated with the following publications: (PMID: 22390909, 9259195, 24956927, 28235710, 34037665, 12837857, 32977124, 32041611, 33391346, 33994402, 32759540, 23375686, 27206935) - |
Pathogenic, criteria provided, single submitter | clinical testing | Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital | Feb 06, 2024 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Mayo Clinic Laboratories, Mayo Clinic | Dec 29, 2021 | PM5, PS3, PS4 - |
Pathogenic, no assertion criteria provided | clinical testing | Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen | - | - - |
Familial hypercholesterolemia Pathogenic:3
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 24, 2024 | This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 90 of the LDLR protein (p.Asp90Asn). This variant is present in population databases (rs749038326, gnomAD 0.08%). This missense change has been observed in individuals with familial hypercholesterolemia (PMID: 9259195, 9763532, 12436241, 12837857, 15823276, 16343504, 21376320, 22390909, 23375686, 25962062, 27206935, 27765764). This variant is also known as p.Asp69Asn. ClinVar contains an entry for this variant (Variation ID: 251105). 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%. Experimental studies have shown that this missense change affects LDLR function (PMID: 12837857). This variant disrupts the p.Asp90 amino acid residue in LDLR. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 1301956, 8347689, 19026292). 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. - |
Pathogenic, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Sep 01, 2023 | This missense variant replaces aspartic acid with asparagine at codon 90 in the second LDLR type A of the ligand binding domain of the LDLR protein. This variant is also known as p.Asp69Asn in the mature protein. 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 has shown that the mutant protein is trapped in the endoplasmic reticulum and shows weak cell surface expression (PMID: 12837857). Cells from an individual compound heterozygous for this variant and p.Cys222* showed no detectable LDLR activity (PMID: 16343504). This variant has been reported in over thirty individuals of varying ethnicities affected with familial hypercholesterolemia (PMID: 9259195, 9763532, 12436241, 12837857, 15823276, 16250003, 16343504, 21376320, 23375686, 25962062, 27206935, 31345425) and is thought to be one of the most common pathogenic mutation in the Chinese population (PMID: 27206935, 30592178, 31686828). This variant has been reported to segregate with disease in one family (PMID: 12837857). This variant has been identified in 17/282878 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Different missense variants occurring at this codon, p.Asp90Gly and p.Asp90AGlu, are known to cause disease (ClinVar variation ID: 226313, 251107), suggesting that aspartic acid at this position is important for LDLR protein function. Based on the available evidence, this variant is classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Sep 08, 2021 | Variant summary: LDLR c.268G>A (p.Asp90Asn) results in a conservative amino acid change in 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 5.6e-05 in 251486 control chromosomes. This frequency is not significantly higher than expected for a pathogenic variant in LDLR causing Familial Hypercholesterolemia (5.6e-05 vs 0.0013), allowing no conclusion about variant significance. c.268G>A has been reported in the literature in multiple individuals affected with Familial Hypercholesterolemia (Mak_1998, Chiou_2016, Fouchier_2005, Chiou_2010). Functional studies have shown the variant to impact LDLR subcellular localization and reduces LDLR activity (Chang_2003). Other variants have been reported in association with Hypercholesterolemia (D90A, D90E, D90G, D90Y). Eight clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. Seven submitters classified as likely pathogenic/pathogenic while one classified as likely benign. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Homozygous familial hypercholesterolemia Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Apr 08, 2019 | The p.Asp90Asn variant in LDLR has been identified in at least 15 individuals with familial hypercholesterolemia (FH): In 12 individuals in the heterozygous state (Day 1997, Mak 1998, Amsellem 2002, Chang 2003, Sozen 2005, Chiou 2011, Bertolini 2013, Norsworthy 2014, Han 2015, Wang 2016, Hsiung 2018) and in 3 invididuals in the compound heterozygous state who had significantly higher serum LDL levels (Bertonlini 2013, Hsiung 2018). It has also been reported by other clinical laboratories in ClinVar (Variation ID 251105) and has been identified in 0.08% (16/19952) of East Asian chromosomes by gnomAD (http://gnomad.broadinstitute.org). An in vitro functional study (Chang 2003) and computational and conservation analysis support an impact on protein function. Additionally, several other variants involving this codon (p.Asp90Tyr, p.Asp90Ala, p.Asp90Gly, and p.Asp90Glu) have been identified in individuals with FH (Stenson 2017), suggesting that changes as this position are not tolerated. In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant FH based upon case observations and functional and computational evidence. ACMG/AMP criteria applied: PM3_Strong, PS4_Moderate, PP3, PS3_Supporting. - |
Cardiovascular phenotype Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | May 04, 2023 | The c.268G>A (p.D90N) alteration is located in exon 3 (coding exon 3) of the LDLR gene. This alteration results from a G to A substitution at nucleotide position 268, causing the aspartic acid (D) at amino acid position 90 to be replaced by an asparagine (N). Based on data from gnomAD, the A allele has an overall frequency of 0.006% (17/282878) total alleles studied. The highest observed frequency was 0.08% (16/19952) of East Asian alleles. This alteration, also known as p.D69N, has been reported in multiple individuals with familial hypercholesterolemia (FH) and in FH cohorts from a variety of ethnic backgrounds (Day, 1997; Mak, 1998; Khoo, 2000; Chang, 2003; Fouchier, 2005; Norsworthy, 2014). Other amino acid substitutions at this position have also been reported in individuals with FH, including D90A (Kolansky, 2008), D90E (Marduel, 2010), D90G (Hobbs, 1992), and D90Y (Rubinsztein, 1993). This amino acid position is highly conserved in available vertebrate species. Based on internal structural analysis, this alteration occurs in a known motif in a region of known function with an effect that matches known phenotype (Kurniawan, 2000). The results of functional studies demonstrated that protein product is retained in the endoplasmic reticulum and enzyme activity is reduced (Chang, 2003). The in silico prediction for this alteration is inconclusive. Based on the available evidence, this alteration is classified as pathogenic. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at