rs28941776

chr19-11116153-G-Achr19-11116153-G-Cchr19-11116153-G-T

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PS1_Moderate PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000527.5(LDLR):c.1646G>A(p.Gly549Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000157 in 1,461,654 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G549A) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: LDLR NM_000527.5 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:30 O:1
• Conservation: PhyloP100: 9.79

Genes affected

LDLR (HGNC:6547): (low density lipoprotein receptor) The low density lipoprotein receptor (LDLR) gene family consists of cell surface proteins involved in receptor-mediated endocytosis of specific ligands. The encoded protein is normally bound at the cell membrane, where it binds low density lipoprotein/cholesterol and is taken into the cell. Lysosomes release the cholesterol, which is made available for repression of microsomal enzyme 3-hydroxy-3-methylglutaryl coenzyme A (HMG CoA) reductase, the rate-limiting step in cholesterol synthesis. At the same time, a reciprocal stimulation of cholesterol ester synthesis takes place. Mutations in this gene cause the autosomal dominant disorder, familial hypercholesterolemia. Alternate splicing results in multiple transcript variants.[provided by RefSeq, May 2022]

ACMG classification

Verdict is Pathogenic. Variant got 20 ACMG points.

• PS1: Transcript NM_000527.5 (LDLR) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000527.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr19-11116152-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2133944.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.996
• PP5: Variant 19-11116153-G-A is Pathogenic according to our data. Variant chr19-11116153-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3698.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-11116153-G-A is described in Lovd as [Pathogenic]. Variant chr19-11116153-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LDLR	NM_000527.5	c.1646G>A	p.Gly549Asp	missense_variant	11/18	ENST00000558518.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LDLR	ENST00000558518.6	c.1646G>A	p.Gly549Asp	missense_variant	11/18	1	NM_000527.5	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000239 AC: 6 AN: 251466 Hom.: 0 AF XY: 0.0000368 AC XY: 5 AN XY: 135910

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000527

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000157 AC: 23 AN: 1461654 Hom.: 0 Cov.: 31 AF XY: 0.0000234 AC XY: 17 AN XY: 727118

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000207

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ExAC AF: 0.0000494 AC: 6

EpiCase AF: 0.0000545

EpiControl AF: 0.000178

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:30 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:19

Likely pathogenic, criteria provided, single submitter	clinical testing	Robarts Research Institute, Western University	-	- -
Likely pathogenic, 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	subjects mutated among 2600 FH index cases screened = 4 , family member = 1 with co-segregation / FH-Palermo, 2% LDLR activity / Software predictions: Damaging -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Feb 15, 2022	- -
Pathogenic, no assertion criteria provided	research	Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum	-	- -
Pathogenic, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Nov 01, 1988	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory of molecular diagnosis of dyslipidemias, Università egli studi di Napoli Federico II	May 24, 2021	Reduced activity, in stimulated T-lymphocytes and EBV-transformed B-lymphocytes. -
Pathogenic, criteria provided, single submitter	clinical testing	U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille	Mar 30, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation	Nov 05, 2016	- -
Likely pathogenic, criteria provided, single submitter	literature only	LDLR-LOVD, British Heart Foundation	Mar 25, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genetics and Molecular Pathology, SA Pathology	May 09, 2022	- -
Likely pathogenic, criteria provided, single submitter	research	Fundacion Hipercolesterolemia Familiar	Mar 01, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute	Feb 11, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Sep 04, 2020	The p.Gly549Asp variant in LDLR has been reported in many individuals with familial hypercholesterolemia and has been shown to segregate in >10 affected family members (Marino 1999 PMID:10338098, Dedoussis 2004 PMID:14974088, Diakou 2010 PMID:22371747, Bertolini 2013 PMID:23375686, Thormaehlen 2015 PMID:25647241, Benito-Vicente 2018 PMID:29874871). This variant is known as a common pathogenic variant in the Italian population, and is referred to as FH Genoa and p.Gly528Asp in the literature. It has been reported in ClinVar (Variation ID 3698). An in vitro functional study indicates that this variant is associated with abnormal transport of LDL receptor protein in which the receptor mislocalizes endoplasmatic reticulum (ER)-like membranes (Benito-Vicente 2018 PMID:29874871). This variant has been identified in 0.005% (6/113752) of European chromosomes by gnomAD (http://gnomad.broadinstitute.org). However, for diseases with clinical variability or reduced penetrance, pathogenic variants may be present at a low frequency in the general population. In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant familial hypercholesterolemia. ACMG/AMP criteria applied: PS4, PP1_Strong, PP3, PS3_Supporting. -
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	Fulgent Genetics, Fulgent Genetics	Oct 31, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Jan 05, 2024	This missense variant replaces glycine with aspartic acid at codon 549 of the LDLR protein. This variant is also known as p.Gly528Asp in the mature protein and as FH Genoa and FH Palermo-1 in the literature. This variant alters a conserved glycine residue in the fourth LDLR type B repeat of the EGF precursor homology domain of the LDLR protein (a.a. 529 - 572), where pathogenic missense variants are found enriched (ClinVar-LDLR). Computational prediction tool suggests that this variant may have a deleterious impact on protein structure and function (internally defined REVEL score threshold >=0.7, PMID: 27666373). High throughput assays and functional studies with heterologous cells and homozygous patient fibroblasts have shown that this variant results in defective LDL transport/uptake and retains <2% LDLR activity compared to wild type (PMID: 1301956, 25647241, 31106925). Heterozygous patient cells showed 35-65% LDLR activity compared to wild type (PMID: 21865347). This variant has been reported in over 100 individuals affected with familial hypercholesterolemia (PMID: 1301956, 9259195, 9544850, 11810272, 15241806, 21865347, 22371747, 23375686, 31106925) and is particularly common in Greek (PMID: 8683740) and Italian populations (PMID: 23375686). This variant has been identified in 6/246260 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on available evidence, this variant is classified as Pathogenic. -
Likely pathogenic, no assertion criteria provided	research	Iberoamerican FH Network	Mar 01, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory of Medical Genetics, National & Kapodistrian University of Athens	Oct 24, 2022	PS3, PM1, PM5, PP2, PP3, PP5 -

not provided Pathogenic:5 Other:1

not provided, no classification provided	in vitro	Dept. of Genetics and Pharmacogenomics, Merck Research Labs	-	- -
Pathogenic, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 30, 2021	Also reported as FH Genoa, FH Palermo-1, and G528D due to alternate nomenclature; Published functional studies demonstrate a damaging effect with abnormal LDL transport/uptake and significantly reduced receptor activity (Hobbs et al., 1990; Romano et al., 2011; Thormaehlen et al., 2015; Rodriguez-Jimenez et al., 2019); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Reported in ClinVar (ClinVar Variant ID#3698; ClinVar); This variant is associated with the following publications: (PMID: 21925044, 29874871, 28965616, 33093846, 23375686, 25487149, 25647241, 25525159, 21865347, 28391899, 20045108, 2088165, 9259195, 9544850, 11317361, 15199436, 15241806, 19446849, 19717150, 19837725, 22371747, 21310417, 25463123, 27578104, 31447099, 31106925, 34040191, 32977124, 32041611, 32770674, 33740630, 34037665) -
Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 02, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 23, 2020	In the published literature, this variant has been reported in individuals affected with familial hypercholesterolemia (FH) (PMIDs: 9259195 (1997), 9544850 (1998), 9974426 (1999), 11317361 (2001), 12436241 (2002), 15199436 (2004), 15241806 (2004), 19837725 (2010), 22371747 (2010), and 23375686 (2013)). In addition, functional analyses report that this variant results in decreased LDLR protein activity, with <2% residual activity in homozygous individuals and a mean residual activity of 50% in heterozygous individuals (PMID: 1301956 (1992), 21865347 (2011), and 25647241 (2015)). Therefore, the variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2023	LDLR: PM1:Strong, PM5, PS3:Moderate, PS4:Moderate -

Familial hypercholesterolemia Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Sep 01, 2023	This missense variant replaces glycine with aspartic acid at codon 549 of the LDLR protein. This variant is also known as p.Gly528Asp in the mature protein and as FH Genoa and FH Palermo-1 in the literature. This variant alters a conserved glycine residue in the fourth LDLR type B repeat of the EGF precursor homology domain of the LDLR protein (a.a. 529 - 572), where pathogenic missense variants are found enriched (ClinVar-LDLR). Computational prediction tool suggests that this variant may have a deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). High throughput assays and functional studies with heterologous cells and homozygous patient fibroblasts have shown that this variant results in defective LDL transport/uptake and retains <2% LDLR activity compared to wild type (PMID: 1301956, 25647241, 31106925). Heterozygous patient cells showed 35-65% LDLR activity compared to wild type (PMID: 21865347). This variant has been reported in over 100 individuals affected with familial hypercholesterolemia (PMID: 1301956, 9259195, 9544850, 11810272, 15241806, 21865347, 22371747, 23375686, 31106925) and is particularly common in Greek (PMID: 8683740) and Italian populations (PMID: 23375686). This variant has been identified in 6/246260 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on available evidence, this variant is classified as Pathogenic. -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Aug 25, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 17, 2024	This sequence change replaces glycine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 549 of the LDLR protein (p.Gly549Asp). This variant is present in population databases (rs28941776, gnomAD 0.005%). This missense change has been observed in individual(s) with familial hypercholesterolemia (PMID: 23375686, 25487149). 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 Italian ancestry (PMID: 23375686, 25487149). This variant is also known as p.Glu528Asp. ClinVar contains an entry for this variant (Variation ID: 3698). 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: 25647241). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine	Aug 06, 2018	The c.1646G>A (p.Gly549Asp) variant has been reported in multiple unrelated patients with familial hypercholesterolemia (PMID 1301956,9259195, 9544850, 11810272, 15199436, 15241806, 19837725, 21865347, 23375686) or myocardial infarction (PMID 25487149). A functional study reported the mutant LDLR protein retains less than 2 percent receptor activity compared to wild type LDLR protein (PMID 1301956) and the variant is classified as 'disruptive' through systematic cell-based phenotyping (PMID 25647241). Therefore, this c.1646G>A (p.Gly549Asp) variant is classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 17, 2017	- -

Cardiovascular phenotype Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

May 02, 2022

The p.G549D pathogenic mutation (also known as c.1646G>A), located in coding exon 11 of the LDLR gene, results from a G to A substitution at nucleotide position 1646. The glycine at codon 549 is replaced by aspartic acid, an amino acid with similar properties. This alteration, also referred to as p.G528D, has been shown to reduce LDLR activity to 35-65% of normal levels in vitro (Romano M et al. J Lipid Res. 2011;52(11):2095-100) and prevent LDLR endocytosis (Thormaehlen AS et al. PLoS Genet. 2015;11(2): e1004855). In addition, this mutation has been found to be a common pathogenic alteration in various familial hypercholesterolemia population cohorts (Traeger-Synodinos J et al. Hum Genet. 1998, Diakou M et al, Arch Med Sci 2010; 6(2):198-200, Bertolini S et al, Atherosclerosis 2013;227(2):342-8; Pirillo A et al. Atheroscler Suppl, 2017 Oct;29:17-24), possibly stemming from a common ancestor (Bertolini S et al. Arterioscler Thromb Vasc Biol. 2000;20(9):E41-52). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.58
Cadd	Pathogenic	26
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D;.;.;.;.;.
Eigen	Uncertain	0.68
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.87	D;D;D;D;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	1.0	D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.8	H;.;.;.;.;H
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-6.6	D;D;D;D;D;D
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		1.0	D;.;.;.;.;.
Vest4		0.94
MutPred		1.0		Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);.;.;.;Loss of sheet (P = 0.1158);
MVP		1.0
MPC		0.93
ClinPred		0.99	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.93
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs28941776; hg19: chr19-11226829;