19-11116884-G-A

Position:

• chr19-11116884-G-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.1731G>A​(p.Trp577Ter) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000658 in 152,048 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: LDLR NM_000527.5 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 9.83

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 19-11116884-G-A is Pathogenic according to our data. Variant chr19-11116884-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 226370.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-11116884-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LDLR	NM_000527.5	c.1731G>A	p.Trp577Ter	stop_gained	12/18	ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.1731G>A	p.Trp577Ter	stop_gained	12/18	1	NM_000527.5	ENSP00000454071	P3

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152048 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 35

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152048 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74262

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Mar 02, 2023	This variant is predicted to result in loss of protein function through nonsense-mediated or protein truncation. Loss of function is an established mechanism of disease. This variant has been reported in multiple individuals with familial hypercholesterolemia in the heterozygous, homozygous, and compound heterozygous states (PMID: 30112042, 33391333, 1301956). Cultured fibroblasts from an individual homozygous for this variant demonstrated LDL receptor activity <2% (PMID: 1301956). This variant is absent from large population databases, including the Genome Aggregation Database (http://gnomad.broadinstitute.org/). -
Pathogenic, criteria provided, single submitter	literature only	LDLR-LOVD, British Heart Foundation	Mar 25, 2016	- -
Pathogenic, no assertion criteria provided	clinical testing	Cardiovascular Genetics Laboratory, PathWest Laboratory Medicine WA - Fiona Stanley Hospital	Mar 17, 2016	- -
Pathogenic, criteria provided, single submitter	curation;literature only	Cardiovascular Research Group, Instituto Nacional de Saude Doutor Ricardo Jorge	Mar 01, 2016	- -

Familial hypercholesterolemia Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 24, 2023	This variant changes 1 nucleotide in exon 12 of the LDLR type B repeat 5 of the LDLR gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. Functional studies using patient-derived homozygous fibroblasts have shown that this variant causes a significant reduction in LDLR activity (PMID: 1301956). This variant has been reported in at least 2 individuals affected with familial hypercholesterolemia (PMID: 34037665, 34297352). This variant has also been observed in compound heterozygous state in individuals affected with homozygous familial hypercholesterolemia (PMID: 1301956, 30112042), indicating that this variant contributes to disease. This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of LDLR function is a known mechanism of disease (clinicalgenome.org). A different variant affecting the same codon and causing the same premature translation stop signal, c.1730G>A p.Trp577*, is also considered to be disease-causing (ClinVar variation ID: 375821). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 12, 2022	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 226370). This variant is also known as Stop 556. This premature translational stop signal has been observed in individual(s) with familial hypercholesterolemia (FH) (PMID: 1301956, 23680767, 26802169). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Trp577*) 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). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	50
DANN	Uncertain	1.0
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.69
FATHMM_MKL	Pathogenic	0.99	D
MutationTaster	Benign	1.0	A;A;A;A;A;A;A
Vest4		0.94
GERP RS		5.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs875989928; hg19: chr19-11227560;