NM_000527.5(LDLR):c.666C>T (p.Cys222=) AND Hypercholesterolemia, familial, 1

Germline classification:: Uncertain significance (3 submissions)
Last evaluated:: Mar 20, 2023
Review status:: 3 stars out of maximum of 4 stars
reviewed by expert panel

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000508956.4

Allele description [Variation Report for NM_000527.5(LDLR):c.666C>T (p.Cys222=)]

NM_000527.5(LDLR):c.666C>T (p.Cys222=)

Gene:

LDLR:low density lipoprotein receptor [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

19p13.2

Genomic location:

Preferred name:

NM_000527.5(LDLR):c.666C>T (p.Cys222=)

Other names:

NM_000527.5(LDLR):c.666C>T; p.Cys222=

HGVS:

NC_000019.10:g.11105572C>T
NG_009060.1:g.21192C>T
NM_000527.5:c.666C>TMANE SELECT
NM_001195798.2:c.666C>T
NM_001195799.2:c.543C>T
NM_001195800.2:c.314-1820C>T
NM_001195803.2:c.314-993C>T
NP_000518.1:p.Cys222=
NP_000518.1:p.Cys222=
NP_001182727.1:p.Cys222=
NP_001182728.1:p.Cys181=
LRG_274t1:c.666C>T
LRG_274:g.21192C>T
LRG_274p1:p.Cys222=
NC_000019.9:g.11216248C>T
NC_000019.9:g.11216248C>T
NM_000527.4:c.666C>T

Links:

dbSNP: rs756613387

NCBI 1000 Genomes Browser:

rs756613387

Molecular consequence:

NM_001195800.2:c.314-1820C>T - intron variant - [Sequence Ontology: SO:0001627]
NM_001195803.2:c.314-993C>T - intron variant - [Sequence Ontology: SO:0001627]
NM_000527.5:c.666C>T - synonymous variant - [Sequence Ontology: SO:0001819]
NM_001195798.2:c.666C>T - synonymous variant - [Sequence Ontology: SO:0001819]
NM_001195799.2:c.543C>T - synonymous variant - [Sequence Ontology: SO:0001819]

Observations:

Condition(s)

Name:: Hypercholesterolemia, familial, 1
Synonyms:: LDL RECEPTOR DISORDER; Hyperlipoproteinemia Type IIa; HYPER-LOW-DENSITY-LIPOPROTEINEMIA; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0007750; MedGen: C0745103; Orphanet: 391665; OMIM: 143890

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000606191	Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum	no assertion criteria provided	Pathogenic	germline	research
SCV004022422	ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel	reviewed by expert panel (ClinGen FH ACMG Specifications v1-2)	Uncertain significance (Mar 20, 2023)	germline	curation	Citation Link,
SCV004820195	All of Us Research Program, National Institutes of Health	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain Significance (Dec 1, 2023)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000606191

Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum

no assertion criteria provided

Pathogenic

germline

research

SCV004022422

ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel

reviewed by expert panel

(ClinGen FH ACMG Specifications v1-2)

Uncertain significance
(Mar 20, 2023)

germline

curation

Citation Link,

SCV004820195

All of Us Research Program, National Institutes of Health

criteria provided, single submitter

(ACMG Guidelines, 2015)

Uncertain Significance
(Dec 1, 2023)

germline

clinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	unknown	1	not provided	not provided	108544	not provided	clinical testing, research, curation

Citations

PubMed

Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.

Richards S, Aziz N, Bale S, Bick D, Das S, Gastier-Foster J, Grody WW, Hegde M, Lyon E, Spector E, Voelkerding K, Rehm HL; ACMG Laboratory Quality Assurance Committee..

Genet Med. 2015 May;17(5):405-24. doi: 10.1038/gim.2015.30. Epub 2015 Mar 5.

PubMed [citation]

PMID:: 25741868
PMCID:: PMC4544753

Details of each submission

From Laboratorium voor Moleculaire Diagnostiek Experimentele Vasculaire Geneeskunde, Academisch Medisch Centrum, SCV000606191.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	research	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From ClinGen Familial Hypercholesterolemia Variant Curation Expert Panel, SCV004022422.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	curation	not provided

Description

The NM_000527.5(LDLR):c.666C>T (p.Cys222=) variant is classified as Uncertain significance - conflicting evidence for Familial Hypercholesterolemia by applying evidence codes (PM2, BP4, BP7) 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: PopMax MAF = 0.000008864 (0.0008864%) in European (non-Finnish) exomes (gnomAD v2.1.1). - BP4: No REVEL, splicing evaluation required. Functional data on splicing not available. B) variant is exonic and at least 50bp downstream from canonical acceptor site and creates GT MES scores: de novo variant = 5.19; canonical donor = 7.67. Ratio de novo variant/canonical donor = 5.19/7.67 = 0.67 --- it is below 0.8 Variant is not predicted to alter splicing. - BP7: Variant is synonymous and meets BP4.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From All of Us Research Program, National Institutes of Health, SCV004820195.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	1	not provided	not provided	clinical testing	PubMed (1)

Description

This synonymous variant does not change the amino acid sequence of the LDLR protein. However, splice site prediction tools suggest that this variant may impact RNA splicing. To our knowledge, functional studies have not been performed to investigate this prediction. This variant has not been reported in individuals affected with familial hypercholesterolemia in the literature. This variant has been identified in 1/249708 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	108544	not provided	not provided		1	not provided	not provided	not provided

Last Updated: Sep 29, 2024

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