rs793888519

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PM4_SupportingBP6BS2

The NM_000384.3(APOB):c.6639_6641del(p.Asp2213del) variant causes a inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00409 in 1,561,718 control chromosomes in the GnomAD database, including 42 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. D2213D) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0042 ( 2 hom., cov: 33)

Exomes 𝑓: 0.0041 ( 40 hom. )

Consequence

APOB
NM_000384.3 inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:14

Conservation

PhyloP100: 2.98

Variant links:

Genes affected

APOB (HGNC:603): (apolipoprotein B) This gene product is the main apolipoprotein of chylomicrons and low density lipoproteins (LDL), and is the ligand for the LDL receptor. It occurs in plasma as two main isoforms, apoB-48 and apoB-100: the former is synthesized exclusively in the gut and the latter in the liver. The intestinal and the hepatic forms of apoB are encoded by a single gene from a single, very long mRNA. The two isoforms share a common N-terminal sequence. The shorter apoB-48 protein is produced after RNA editing of the apoB-100 transcript at residue 2180 (CAA->UAA), resulting in the creation of a stop codon, and early translation termination. Mutations in this gene or its regulatory region cause hypobetalipoproteinemia, normotriglyceridemic hypobetalipoproteinemia, and hypercholesterolemia due to ligand-defective apoB, diseases affecting plasma cholesterol and apoB levels. [provided by RefSeq, Dec 2019]

APOB links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PM4

Nonframeshift variant in NON repetitive region in NM_000384.3. Strenght limited to Supporting due to length of the change: 1aa.

BP6

Variant 2-21010226-CTCA-C is Benign according to our data. Variant chr2-21010226-CTCA-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 180280.We mark this variant Likely_benign, oryginal submissions are: {Benign=6, Uncertain_significance=3, Likely_benign=8}. Variant chr2-21010226-CTCA-C is described in Lovd as [Benign]. Variant chr2-21010226-CTCA-C is described in Lovd as [Likely_benign].

BS2

High Homozygotes in GnomAd at 2 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APOB	NM_000384.3 linkuse as main transcript	c.6639_6641del	p.Asp2213del	inframe_deletion	26/29	ENST00000233242.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APOB	ENST00000233242.5 linkuse as main transcript	c.6639_6641del	p.Asp2213del	inframe_deletion	26/29	1	NM_000384.3	P1

Frequencies

GnomAD3 genomes

AF:

0.00416

AC:

633

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000652

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000982

Gnomad ASJ

AF:

0.000577

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00228

Gnomad FIN

AF:

0.0170

Gnomad MID

AF:

0.00318

Gnomad NFE

AF:

0.00573

Gnomad OTH

AF:

0.00335

GnomAD3 exomes

AF:

0.00490

AC:

1069

AN:

217994

Hom.:

AF XY:

0.00508

AC XY:

601

AN XY:

118418

show subpopulations

Gnomad AFR exome

AF:

0.000333

Gnomad AMR exome

AF:

0.000998

Gnomad ASJ exome

AF:

0.000872

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00172

Gnomad FIN exome

AF:

0.0190

Gnomad NFE exome

AF:

0.00583

Gnomad OTH exome

AF:

0.00601

GnomAD4 exome

AF:

0.00408

AC:

5752

AN:

1409456

Hom.:

AF XY:

0.00401

AC XY:

2795

AN XY:

696196

show subpopulations

Gnomad4 AFR exome

AF:

0.000353

Gnomad4 AMR exome

AF:

0.00121

Gnomad4 ASJ exome

AF:

0.00136

Gnomad4 EAS exome

AF:

0.0000256

Gnomad4 SAS exome

AF:

0.00181

Gnomad4 FIN exome

AF:

0.0191

Gnomad4 NFE exome

AF:

0.00402

Gnomad4 OTH exome

AF:

0.00346

GnomAD4 genome

AF:

0.00416

AC:

633

AN:

152262

Hom.:

Cov.:

AF XY:

0.00442

AC XY:

329

AN XY:

74446

show subpopulations

Gnomad4 AFR

AF:

0.000650

Gnomad4 AMR

AF:

0.000981

Gnomad4 ASJ

AF:

0.000577

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00228

Gnomad4 FIN

AF:

0.0170

Gnomad4 NFE

AF:

0.00573

Gnomad4 OTH

AF:

0.00332

Alfa

AF:

0.00525

Hom.:

Bravo

AF:

0.00251

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:14

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hypercholesterolemia, familial, 1

Uncertain:4Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jun 14, 2016	- -
Uncertain significance, criteria provided, single submitter	research	Laboratory of Genetics and Molecular Cardiology, University of São Paulo	Mar 01, 2016	- -
Likely benign, criteria provided, single submitter	research	Institute for Integrative and Experimental Genomics, University of Luebeck	-	- -
Uncertain significance, criteria provided, single submitter	research	Cardiovascular Research Group, Instituto Nacional de Saude Doutor Ricardo Jorge	Mar 01, 2016	1/96 normolipidaemic Portuguese controls -
Likely benign, criteria provided, single submitter	clinical testing	Robarts Research Institute, Western University	Jan 02, 2018	- -
Uncertain significance, criteria provided, single submitter	research	Iberoamerican FH Network	Mar 01, 2016	- -
Uncertain significance, no assertion criteria provided	clinical testing	Blueprint Genetics	Oct 07, 2014	- -

not provided

Benign:4

Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Mar 01, 2024	APOB: PM4:Supporting, BS2 -
Benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 07, 2018	- -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Sep 29, 2023	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 31, 2019	This variant is associated with the following publications: (PMID: 27153395, 9050776, 24234650, 23680767, 33111339) -

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 28, 2016	Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: ExAC: 1.9% (122/6498) Finnish chromosomes -
Likely benign, criteria provided, single submitter	clinical testing	Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute	Jul 06, 2017	- -

Hypercholesterolemia, autosomal dominant, type B;C4551990:Familial hypobetalipoproteinemia 1

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

APOB-related condition

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Nov 14, 2019

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Hypercholesterolemia, autosomal dominant, type B

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Institute of Human Genetics, University of Leipzig Medical Center

Jan 01, 2019

- -

Cardiovascular phenotype

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 09, 2017

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Familial hypercholesterolemia

Benign:1

Benign, criteria provided, single submitter

clinical testing

Color Diagnostics, LLC DBA Color Health

Mar 07, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over