NR_163945.1:n.250G>T

Variant names:

• chr19-11089410-C-A
• rs879254371
• NR_163945.1:n.250G>T

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.250G>T variant causes a non coding transcript exon change. The variant allele was found at a frequency of 0.00000193 in 517,480 control chromosomes in the GnomAD database, with no homozygous occurrence. 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.)
• Consequence: LDLR-AS1 NR_163945.1 non_coding_transcript_exon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.66
• Publications: 8 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=-0.11).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LDLR	NM_000527.5	c.-139C>A		upstream_gene_variant		ENST00000558518.6	NP_000518.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LDLR	ENST00000558518.6	c.-139C>A		upstream_gene_variant		1	NM_000527.5	ENSP00000454071.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000193 AC: 1 AN: 517480 Hom.: 0 Cov.: 7 AF XY: 0.00000369 AC XY: 1 AN XY: 270964

African (AFR) AF: 0.00 AC: 0 AN: 14302

American (AMR) AF: 0.00 AC: 0 AN: 23360

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 14970

East Asian (EAS) AF: 0.00 AC: 0 AN: 31280

South Asian (SAS) AF: 0.00 AC: 0 AN: 50626

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 33112

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

European-Non Finnish (NFE) AF: 0.00000313 AC: 1 AN: 319264

Other (OTH) AF: 0.00 AC: 0 AN: 28440

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypercholesterolemia, familial, 1 Uncertain:1

Mar 25, 2016

LDLR-LOVD, British Heart Foundation

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: literature only

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.11
CADD	Benign	22
DANN	Benign	0.97
PhyloP100		3.7
PromoterAI		-0.93	Under-expression
Mutation Taster		=15/285	disease causing

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: rs879254371; hg19: chr19-11200086;