chr19-11105436-C-G

Variant names:

• chr19-11105436-C-G
• NM_000527.5:c.530C>G

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP3_Strong PP5

The NM_000527.5(LDLR):​c.530C>G​(p.Ser177Trp) variant causes a missense change. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S177L) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: LDLR NM_000527.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 4.87

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 11 ACMG points.

• PM1: In a helix (size 2) in uniprot entity LDLR_HUMAN there are 14 pathogenic changes around while only 0 benign (100%) 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 chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.967
• PP5: Variant 19-11105436-C-G is Pathogenic according to our data. Variant chr19-11105436-C-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1746749.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LDLR	NM_000527.5	c.530C>G	p.Ser177Trp	missense_variant	Exon 4 of 18	ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.530C>G	p.Ser177Trp	missense_variant	Exon 4 of 18	1	NM_000527.5	ENSP00000454071.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Cardiovascular phenotype Pathogenic:1

May 05, 2018

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.S177W variant (also known as c.530C>G), located in coding exon 4 of the LDLR gene, results from a C to G substitution at nucleotide position 530. The serine at codon 177 is replaced by tryptophan, an amino acid with highly dissimilar properties. This alteration is located in the highly conserved SDE motif in LDLR class A repeat 4, and internal structural analysis indicates that this variant disrupts a region of known function (Ambry internal data; Yamamoto T et al. Cell. 1984;39:27-38; Südhof TC et al. Science. 1985;228:815-22; Rudenko G et al. Science. 2002;298:2353-8). Furthermore, a disease-causing mutation and a likely pathogenic variant (p.S177L and p.S177P, respectively) have been described in the same codon (Hobbs HH et al. J. Clin. Invest. 1989;84:656-64; Gabová D et al. Physiol Res. 2017;66:75-84). This amino acid position is highly conserved in available 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. -

not provided Uncertain:1

Aug 12, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The LDLR c.530C>G (p.Ser177Trp) variant has been reported in the published literature in an individual with familial hypercholesterolemia (FH) (PMID: 34182004 (2021)). A different amino acid change at the same codon, c.530C>T (p.Ser177Leu), has been described as being pathogenic and observed in individuals with FH (PMIDs: 27824480 (2017), 27816806 (2016), and ClinGen FH Expert Panel (https://erepo.clinicalgenome.org/)). The c.530C>G (p.Ser177Trp) variant has not been reported in large, multi-ethnic general populations (Genome Aggregation Database, http://gnomad.broadinstitute.org). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is damaging. Based on the available information, we are unable to determine the clinical significance of this variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.96	D;.;.;.
Eigen	Pathogenic	0.80
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Pathogenic	0.82	D
MetaRNN	Pathogenic	0.97	D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.8	H;.;.;H
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-6.4	D;D;D;D
REVEL	Pathogenic	0.85
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.73
MutPred		0.68		Loss of disorder (P = 0.0039);Loss of disorder (P = 0.0039);.;Loss of disorder (P = 0.0039);
MVP		1.0
MPC		0.95
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.92
gMVP		1.0

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-11216112;