rs773693079

Positions:

• chr19-11120221-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PM5

The NM_000527.5(LDLR):​c.1975A>C​(p.Thr659Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. T659?) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LDLR NM_000527.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 B:1
• Conservation: PhyloP100: 1.80

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr19-11120231-GAG-GC is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LDLR	NM_000527.5	c.1975A>C	p.Thr659Pro	missense_variant	13/18	ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.1975A>C	p.Thr659Pro	missense_variant	13/18	1	NM_000527.5	ENSP00000454071.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000547 AC: 8 AN: 1461820 Hom.: 0 Cov.: 35 AF XY: 0.00000550 AC XY: 4 AN XY: 727212

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: 0.000112

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ExAC AF: 0.000239 AC: 29

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:2 Benign:1

Likely 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	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 members = 7 with co-segregation / previously described in association with FH/Software predictions: Conflicting -
Likely benign, criteria provided, single submitter	literature only	LDLR-LOVD, British Heart Foundation	Mar 25, 2016	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.34
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.10
CADD	Uncertain	24
DANN	Benign	0.94
DEOGEN2	Uncertain	0.57	D;.;.;.;.;.
Eigen	Benign	-0.077
Eigen_PC	Benign	-0.020
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.80	T;D;T;T;T;T
M_CAP	Pathogenic	0.56	D
MetaRNN	Uncertain	0.65	D;D;D;D;D;D
MetaSVM	Uncertain	0.088	D
MutationAssessor	Benign	1.7	L;.;.;.;.;L
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-2.0	N;N;N;N;N;N
REVEL	Pathogenic	0.65
Sift	Benign	0.10	T;D;T;T;T;T
Sift4G	Benign	0.080	T;T;T;T;T;T
Polyphen		0.045	B;.;.;.;.;.
Vest4		0.36
MutPred		0.85		Loss of sheet (P = 0.0181);Loss of sheet (P = 0.0181);.;.;.;Loss of sheet (P = 0.0181);
MVP		1.0
MPC		0.37
ClinPred		0.063	T
GERP RS		4.3
Varity_R		0.76
gMVP		0.93

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: rs773693079; hg19: chr19-11230897;