chr19-11089595-T-C

Variant names:

• chr19-11089595-T-C
• rs879254391
• NM_000527.5:c.47T>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PS4_Supporting PP4

This summary comes from the ClinGen Evidence Repository: The NM_000527.5(LDLR):c.47T>C (p.Leu16Pro) variant is classified as Uncertain significance - insufficient evidence for Familial Hypercholesterolemia by applying evidence codes PS4_Supporting, PM2, and PP4 as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1016/j.gim.2021.09.012). The supporting evidence is as follows: PM2: This variant is absent from gnomAD (gnomAD v2.1.1.). So PM2 is met.PS4_Supporting: Variant meets PM2 and is identified in 2 unrelated index cases, as follows: 1 case with Simon-Broome criteria of possible FH from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation); 1 case with DLCN criteria =9 (>6) from PMID 33668494 (Sabatel-Pérez et al, 2021). So PS4_Supporting is met. PP4: Variant meets PM2. Identified in 2 unrelated index cases who fulfill clinical criteria for FH (see PS4_Supporting for details). So PP4 is met. LINK:https://erepo.genome.network/evrepo/ui/classification/CA10584733/MONDO:0007750/013

• Frequency: Genomes: not found (cov: 32)
• Consequence: LDLR NM_000527.5 missense
• Clinical Significance: Uncertain significance reviewed by expert panel P:1 U:2
• Conservation: PhyloP100: 3.10

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]

LDLR-AS1 (HGNC:54407): (LDLR antisense RNA 1) This gene represents a regulatory lncRNA that overlaps the 5' UTR and coding sequence of the LDLR (low density lipoprotein receptor) gene. This lncRNA overlaps LDLR in the antisense orientation, and has been shown to downregulate production of the low density lipoprotein receptor. [provided by RefSeq, Jul 2019]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PS4: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LDLR	NM_000527.5	c.47T>C	p.Leu16Pro	missense_variant	Exon 1 of 18	ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.47T>C	p.Leu16Pro	missense_variant	Exon 1 of 18	1	NM_000527.5	ENSP00000454071.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Hypercholesterolemia, familial, 1 Pathogenic:1 Uncertain:2

Mar 01, 2016

Fundacion Hipercolesterolemia Familiar

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Mar 25, 2016

LDLR-LOVD, British Heart Foundation

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: literature only

- -

Aug 29, 2022

ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The NM_000527.5(LDLR):c.47T>C (p.Leu16Pro) variant is classified as Uncertain significance - insufficient evidence for Familial Hypercholesterolemia by applying evidence codes PS4_Supporting, PM2, and PP4 as defined by the ClinGen Familial Hypercholesterolemia Expert Panel LDLR-specific variant curation guidelines (https://doi.org/10.1016/j.gim.2021.09.012). The supporting evidence is as follows: PM2: This variant is absent from gnomAD (gnomAD v2.1.1.). So PM2 is met. PS4_Supporting: Variant meets PM2 and is identified in 2 unrelated index cases, as follows: 1 case with Simon-Broome criteria of possible FH from Molecular Genetics Laboratory (Centre for Cardiovascular Surgery and Transplantation); 1 case with DLCN criteria =9 (>6) from PMID 33668494 (Sabatel-Pérez et al, 2021). So PS4_Supporting is met. PP4: Variant meets PM2. Identified in 2 unrelated index cases who fulfill clinical criteria for FH (see PS4_Supporting for details). So PP4 is met. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.38
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.46	T;.;.;.;.;.
Eigen	Benign	0.039
Eigen_PC	Benign	-0.090
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.64	T;T;T;T;T;T
M_CAP	Pathogenic	0.43	D
MetaRNN	Uncertain	0.64	D;D;D;D;D;D
MetaSVM	Uncertain	0.40	D
MutationAssessor	Uncertain	2.5	M;.;M;M;M;M
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	-1.0	N;N;N;N;N;N
REVEL	Pathogenic	0.67
Sift	Benign	0.065	T;D;D;D;D;D
Sift4G	Uncertain	0.040	D;D;T;D;D;D
Polyphen		0.94	P;.;.;.;.;.
Vest4		0.70
MutPred		0.63		Gain of glycosylation at L16 (P = 0.0557);Gain of glycosylation at L16 (P = 0.0557);Gain of glycosylation at L16 (P = 0.0557);Gain of glycosylation at L16 (P = 0.0557);Gain of glycosylation at L16 (P = 0.0557);Gain of glycosylation at L16 (P = 0.0557);
MVP		1.0
MPC		0.90
ClinPred		0.93	D
GERP RS		3.7
Varity_R		0.49
gMVP		0.91

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: rs879254391; hg19: chr19-11200271;