chr19-11089411-T-C

Variant names:

• chr19-11089411-T-C
• rs879254372
• NR_163945.1:n.249A>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NR_163945.1(LDLR-AS1):​n.249A>G variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000019 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: LDLR-AS1 NR_163945.1 non_coding_transcript_exon
• Clinical Significance: Uncertain significance reviewed by expert panel P:1 U:4
• Conservation: PhyloP100: 0.859
• Publications: 3 publications found

Genes affected

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]

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 Gene-Disease associations (from GenCC):

• hypercholesterolemia, familial, 1

  Inheritance: AD, SD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, ClinGen
• homozygous familial hypercholesterolemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000307752 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.18).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NR_163945.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LDLR-AS1	NR_163945.1		n.249A>G		non_coding_transcript_exon	Exon 1 of 1
	LDLR	NM_000527.5	MANE Select	c.-138T>C		upstream_gene	N/A	NP_000518.1
	LDLR	NM_001195798.2		c.-138T>C		upstream_gene	N/A	NP_001182727.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	LDLR	ENST00000558518.6	TSL:1 MANE Select	c.-138T>C		upstream_gene	N/A	ENSP00000454071.1
	LDLR	ENST00000558013.5	TSL:1	c.-138T>C		upstream_gene	N/A	ENSP00000453346.1
	LDLR	ENST00000557933.5	TSL:5	c.-138T>C		upstream_gene	N/A	ENSP00000453557.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000192 AC: 1 AN: 519692 Hom.: 0 Cov.: 7 AF XY: 0.00000367 AC XY: 1 AN XY: 272170

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 14346

American (AMR) AF: 0.00 AC: 0 AN: 23394

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14984

East Asian (EAS) AF: 0.00 AC: 0 AN: 31264

South Asian (SAS) AF: 0.00 AC: 0 AN: 50798

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33298

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2126

European-Non Finnish (NFE) AF: 0.00000312 AC: 1 AN: 320984

Other (OTH) AF: 0.00 AC: 0 AN: 28498

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
1	2	-	Hypercholesterolemia, familial, 1 (3)
-	1	-	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.18
CADD	Benign	17
DANN	Benign	0.89
PhyloP100		0.86
PromoterAI		-0.86	Under-expression
Mutation Taster		=288/12	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs879254372; hg19: chr19-11200087;