19-11120425-C-A

Variant names:

• chr19-11120425-C-A
• rs121908031
• NM_000527.5:c.2043C>A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000527.5(LDLR):​c.2043C>A​(p.Cys681*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,784 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 (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: LDLR NM_000527.5 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:34
• Conservation: PhyloP100: -0.847

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 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-11120425-C-A is Pathogenic according to our data. Variant chr19-11120425-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3699.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-11120425-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LDLR	NM_000527.5	c.2043C>A	p.Cys681*	stop_gained	Exon 14 of 18	ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.2043C>A	p.Cys681*	stop_gained	Exon 14 of 18	1	NM_000527.5	ENSP00000454071.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251278 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135852

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: 0.00000880

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461784 Hom.: 0 Cov.: 35 AF XY: 0.00000688 AC XY: 5 AN XY: 727210

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:34

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:21

Nov 05, 2016

Molecular Genetics Laboratory, Centre for Cardiovascular Surgery and Transplantation

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 11, 2019

Brunham Lab, Centre for Heart and Lung Innovation, University of British Columbia

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Mar 25, 2016

LDLR-LOVD, British Heart Foundation

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: literature only

- -

Aug 09, 2018

Department of Human Genetics, Laborarztpraxis Dres. Walther, Weindel und Kollegen

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The nucleotide substitution c.2043C> A leads to a premature termination of protein synthesis at position 681 and is described as "FH Lebanese allele" in the literature. The mutation leads to intracellular degradation of the LDL receptor and loss of function. The mutation described here has also been described in patients with hypercholesterolemia and is therefore classified as pathogenic. PMID: 1453433, 3025214 -

Sep 02, 2022

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, 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 hypercholesterolaemia, 1 (MIM#143890). (I) 0108 - This gene is associated with both recessive and dominant disease. Variants have been reported in heterozygous, compound heterozygous and homozygous state with the recessive disease being more severe (OMIM, PMID: 10978268). (I) 0112 - The condition associated with this gene has incomplete penetrance (GeneReviews). (I) 0201 - Variant is predicted to cause nonsense-mediated decay (NMD) and loss of protein (premature termination codon is located at least 54 nucleotides upstream of the final exon-exon junction). (SP) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v2) <0.001 for a dominant condition (2 heterozygotes, 0 homozygotes). (SP) 0701 - Other NMD-predicted variants comparable to the one identified in this case have very strong previous evidence for pathogenicity. These variants have been reported many times as pathogenic, and observed in individuals with familial hypercholesterolaemia (Decipher). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported many times as pathogenic, and has been observed in both heterozygous and homozygous state in individuals with familial hypercholesterolaemia. It is regarded as a founder variant within the Lebanese population (ClinVar). (SP) 1102 - Strong phenotype match for this individual. (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

-

Robarts Research Institute, Western University

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 01, 1991

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Aug 21, 2023

Laboratory of Medical Genetics, National & Kapodistrian University of Athens

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PVS1, PM2, PP5 - It's pathogenicity has already been established. ClinVar Variation ID 3699. -

Nov 02, 2015

Blueprint Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 30, 2017

U4M - Lille University & CHRU Lille, Université de Lille - CHRU de Lille

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 01, 2016

Fundacion Hipercolesterolemia Familiar

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

May 04, 2012

Cardiovascular Genetics Laboratory, PathWest Laboratory Medicine WA - Fiona Stanley Hospital

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

-

Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Dec 16, 2016

Centre de Génétique Moléculaire et Chromosomique, Unité de génétique de l'Obésité et des Dyslipidémies, APHP, GH Hôpitaux Universitaires Pitié-Salpêtrière / Charles-Foix

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

subjects mutated among 2600 FH index cases screened = 31 (1 homozygote) , family members = 17 with co-segregation / FH-Libanon, < 2% LDLR Activity -

Nov 21, 2023

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Criteria applied: PVS1,PS4,PM2_SUP,PP1 -

-

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 01, 2016

Iberoamerican FH Network

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Dec 18, 2023

All of Us Research Program, National Institutes of Health

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant changes 1 nucleotide in exon 14 of the LDLR gene, creating a premature translation stop signal. This variant is also known as p.Cys660* in the mature protein. This variant is expected to result in an absent or non-functional protein product. Functional studies have shown that this variant causes a significant decrease in LDLR expression and LDL uptake (PMID: 31578082). This variant has been reported in over 100 individuals affected with familial hypercholesterolemia (PMID: 3025214, 11668627, 19319977, 21145767, 25461735, 28502510, 28761763, 28873201, 31578082, 34321884) and is considered to be a founder variant in the Lebanese population (PMID: 19319977). This variant has also been observed in both homozygous and compound heterozygous state with a known pathogenic LDLR variant in multiple individuals affected with severe homozygous familial hypercholesterolemia, a phenotype expected of having two deleterious LDLR variants (PMID: 28761763, 31578082). It has been shown that this variant segregates with disease in multiple affected individuals across multiple families (PMID: 19319977, 34321884). This variant has been identified in 2/251278 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of LDLR function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

Mar 01, 2016

Laboratory of Genetics and Molecular Cardiology, University of São Paulo

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Nov 14, 2022

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:5

Mar 06, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This nonsense variant causes the premature termination of LDLR protein synthesis. The frequency of this variant in the general population, 0.000008 (2/251278 chromosomes, http://gnomad.broadinstitute.org), is consistent with pathogenicity. In the published literature, the variant has been reported as a Lebanese founder mutation, but has also been identified in multiple other ethnic groups, in individuals and families with familial hypercholesterolemia (PMID: 28873201 (2017), 25461735 (2015), 22487947 (2012), 21145767 (2011), 19319977 (2009), 14974088 (2004), 11668627 (2001), 9664576 (1998), 3025214 (1987)). In a functional study, this variant was found to have a damaging effect on LDLR expression and binding (PMID: 31578082 (2019)). Based on the available information, this variant is classified as pathogenic. -

Jul 13, 2022

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 08, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Reported many times in the heterozygous, compound heterozygous, and homozygous states in individuals with FH (PMID: 9664576, 9259195, 3025214, 10737984, 11668627, 12406975, 15200491, 28873201, 30179711); Considered a Lebanese founder mutation and may account for greater than 80% of FH cases in this population (PMID: 19319977); Published functional studies suggest a damaging effect on protein expression and binding (PMID: 31578082); Not observed at significant frequency in large population cohorts (gnomAD); Also known as p.(C660X); This variant is associated with the following publications: (PMID: 31447099, 22487947, 25487149, 25525159, 3025214, 9259195, 9664576, 10737984, 11668627, 12406975, 15200491, 28873201, 30179711, 29407885, 34040191, 33303402, 34037665, 32041611, 33740630, 32770674, 33418990, 32231684, 35379577, 32009526, 33955087, 34321884, 15321837, 19319977, 37128917, 31578082) -

Sep 16, 2018

Gharavi Laboratory, Columbia University

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

May 04, 2023

Mayo Clinic Laboratories, Mayo Clinic

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PP1, PS3, PS4_moderate, PVS1 -

Familial hypercholesterolemia Pathogenic:5

Aug 17, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 26, 2016

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The LDLR c.2043C>A (p.Cys681X) variant results in a premature termination codon, predicted to cause a truncated or absent LDLR protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified in the pathogenic spectrum by our laboratory (e.g. p.Trp813X, p.Ser710fsX2 ). Mutation taster predicts a damaging outcome for this variant. This variant was found in 1/121136 control chromosomes at a frequency of 0.0000083, which does not exceed the estimated maximal expected allele frequency of a pathogenic LDLR variant (0.0025031). It was observed in several FH families and showed co-segregation with the disease indicating causality. Moreover, the variant was shown to result in lack of detectable high affinity binding and uptake of LDL, further supporting pathogenicity. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as pathogenic. Taken together, this variant is classified as pathogenic. -

Jul 31, 2018

Human Genome Sequencing Center Clinical Lab, Baylor College of Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2043C>A (p.Cys681*) variant in the LDLR gene has been reported in multiple individual patients with familial Hypercholesterolemia and segregated in the families (PMID: 3025214, 1959928, 1453433, 12406975, 22487947). This variant is extremely rare in general population and is predicted to introduce a premature translation termination codon. Therefore, the c.2043C>A (p.Cys681*) variant in the LDLR gene is classified as pathogenic. -

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Cys681*) in the LDLR gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LDLR are known to be pathogenic (PMID: 20809525, 28645073). This variant is present in population databases (rs121908031, gnomAD 0.003%). This premature translational stop signal has been observed in individual(s) with familial hypercholesterolemia (PMID: 1959928, 11668627, 19319977, 21145767, 22487947, 25461735). It has also been observed to segregate with disease in related individuals. 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.Cys660*. ClinVar contains an entry for this variant (Variation ID: 3699). For these reasons, this variant has been classified as Pathogenic. -

Oct 19, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant changes 1 nucleotide in exon 14 of the LDLR gene, creating a premature translation stop signal. This variant is also known as p.Cys660* in the mature protein. This variant is expected to result in an absent or non-functional protein product. Functional studies have shown that this variant causes a significant decrease in LDLR expression and LDL uptake (PMID: 31578082). This variant has been reported in over 100 individuals affected with familial hypercholesterolemia (PMID: 3025214, 11668627, 19319977, 21145767, 25461735, 28502510, 28761763, 28873201, 31578082, 34321884) and is considered to be a founder variant in the Lebanese population (PMID: 19319977). This variant has also been observed in both homozygous and compound heterozygous state with a known pathogenic LDLR variant in multiple individuals affected with severe homozygous familial hypercholesterolemia, a phenotype expected of having two deleterious LDLR variants (PMID: 28761763, 31578082). It has been shown that this variant segregates with disease in multiple affected individuals across multiple families (PMID: 19319977, 34321884). This variant has been identified in 2/251278 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of LDLR function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -

Homozygous familial hypercholesterolemia Pathogenic:1

Feb 22, 2021

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Cys681X variant in LDLR has been reported in >80 individuals with hypercholesterolemia across several studies and segregated with disease in >10 affected relatives (Abifadel 2009, Banares 2017, Fahed 2011, Jannes 2015, Lehrman 1987, Tichy 2012, Vandrovcova 2013). This variant is considered to be a founder variant in the Lebanese population (Fahed 2016). This variant has also been reported in Clinvar (Variation ID 3699) and has been identified in 1/113666 European chromosomes by gnomAD (http://gnomad.broadinstitute.org). This nonsense variant leads to a premature termination codon at position 681, which is predicted to lead to a truncated or absent protein. Heterozygous loss of function of the LDLR gene is an established disease mechanism in familial hypercholesterolemia (FH). In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant FH. ACMG/AMP criteria applied: PVS1, PS4, PM2, PP1_Strong. -

See cases Pathogenic:1

Mar 04, 2021

Institute of Human Genetics, University Hospital Muenster

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG categories: PVS1,PM2,PP1,PP5 -

Cardiovascular phenotype Pathogenic:1

Aug 29, 2022

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2043C>A (p.C681*) alteration, located in exon 14 (coding exon 14) of the LDLR gene, consists of a C to A substitution at nucleotide position 2043. This changes the amino acid from a cysteine (C) to a stop codon at amino acid position 681. This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. This alteration, also noted as p.C660X or the Lebanese allele, has been reported in individuals with familial hypercholesterolemia and a founder effect was proposed (Lehrman, 1987; Abifadel, 2009; Fahed, 2012). Based on the available evidence, this alteration is classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.57	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	34
DANN	Uncertain	0.98
Eigen	Benign	-0.25
Eigen_PC	Benign	-0.58
FATHMM_MKL	Uncertain	0.91	D
Vest4		0.94
GERP RS		-4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs121908031; hg19: chr19-11231101;