19-11105422-C-G

Position:

• chr19-11105422-C-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000527.5(LDLR):​c.516C>G​(p.Asp172Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D172G) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: LDLR NM_000527.5 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 1.36

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.

• PM1: In a hotspot region, there are 13 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 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 chr19-11105421-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 251269.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.982
• PP5: Variant 19-11105422-C-G is Pathogenic according to our data. Variant chr19-11105422-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 251271.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr19-11105422-C-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LDLR	NM_000527.5	c.516C>G	p.Asp172Glu	missense_variant	4/18	ENST00000558518.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LDLR	ENST00000558518.6	c.516C>G	p.Asp172Glu	missense_variant	4/18	1	NM_000527.5	P3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

literature only

LDLR-LOVD, British Heart Foundation

Mar 25, 2016

- -

Cardiovascular phenotype Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 04, 2019

The p.D172E variant (also known as c.516C>G), located in coding exon 4 of the LDLR gene, results from a C to G substitution at nucleotide position 516. The aspartic acid at codon 172 is replaced by glutamic acid, an amino acid with highly similar properties. This alteration (also described as legacy p.D151E) and close match p.D172E (c.516C>A) have been reported in patients with familial hypercholesterolemia (Chiou KR et al. Am. J. Cardiol., 2010 Jun;105:1752-8; Du R et al. Springerplus, 2016 Dec;5:2095; Xiang R et al. Atherosclerosis, 2017 Feb;258:84-88). Additional alterations at this position have also been reported in individuals with familial hypercholesterolemia (Thiart R et al. J. Med. Genet., 2000 Jul;37:514-9; Pongrapeeporn KU et al. J Med Assoc Thai, 2000 Nov;83 Suppl 2:S66-73; Leren TP et al. Semin Vasc Med, 2004 Feb;4:75-85; Dušková L et al. Atherosclerosis, 2011 May;216:139-45). This amino acid position is well conserved in available vertebrate species; however, glutamic acid is the reference amino acid in other vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.20
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	D;.;.;.
Eigen	Benign	-0.026
Eigen_PC	Benign	-0.16
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	T;T;T;T
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.98	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.9	M;.;.;M
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-3.6	D;D;D;D
REVEL	Pathogenic	0.71
Sift	Benign	0.045	D;D;D;D
Sift4G	Uncertain	0.021	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.45
MutPred		0.94		Gain of phosphorylation at S177 (P = 0.2061);Gain of phosphorylation at S177 (P = 0.2061);.;Gain of phosphorylation at S177 (P = 0.2061);
MVP		1.0
MPC		0.55
ClinPred		0.98	D
GERP RS		0.91
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.91
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs879254557; hg19: chr19-11216098;