2-21009583-A-T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBP6

The NM_000384.3(APOB):c.7285T>A(p.Ser2429Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000724 in 1,613,954 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00060 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00074 ( 1 hom. )

Consequence

APOB
NM_000384.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:7

Conservation

PhyloP100: -0.0170

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 -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.007686913).

BP6

Variant 2-21009583-A-T is Benign according to our data. Variant chr2-21009583-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 218448.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=5, Uncertain_significance=9}. Variant chr2-21009583-A-T is described in Lovd as [Benign]. Variant chr2-21009583-A-T is described in Lovd as [Likely_benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APOB	NM_000384.3 link	c.7285T>A	p.Ser2429Thr	missense_variant	Exon 26 of 29	ENST00000233242.5	NP_000375.3	P04114Q7Z7Q0Q59HB3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APOB	ENST00000233242.5 link	c.7285T>A	p.Ser2429Thr	missense_variant	Exon 26 of 29	1	NM_000384.3	ENSP00000233242.1		P04114

Frequencies

GnomAD3 genomes

AF:

0.000598

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00663

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000867

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000690

AC:

173

AN:

250820

Hom.:

AF XY:

0.000738

AC XY:

100

AN XY:

135544

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000260

Gnomad ASJ exome

AF:

0.00388

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.00104

Gnomad OTH exome

AF:

0.000492

GnomAD4 exome

AF:

0.000737

AC:

1077

AN:

1461642

Hom.:

Cov.:

AF XY:

0.000758

AC XY:

551

AN XY:

727132

show subpopulations

Gnomad4 AFR exome

AF:

0.000179

Gnomad4 AMR exome

AF:

0.000268

Gnomad4 ASJ exome

AF:

0.00471

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000749

Gnomad4 NFE exome

AF:

0.000794

Gnomad4 OTH exome

AF:

0.000712

GnomAD4 genome

AF:

0.000597

AC:

AN:

152312

Hom.:

Cov.:

AF XY:

0.000470

AC XY:

AN XY:

74484

show subpopulations

Gnomad4 AFR

AF:

0.000144

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00663

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000867

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.00109

Hom.:

Bravo

AF:

0.000661

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00130

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00163

AC:

ExAC

AF:

0.000807

AC:

EpiCase

AF:

0.00142

EpiControl

AF:

0.00142

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:7

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:3Benign:3

Jul 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

APOB: BP4 -

Apr 26, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 23, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Identified in at least one individual with hypertriglyceridemia and possible FH in published literature (Johansen et al., 2010; Radovica-Spalvine et al., 2015); Identified in two unrelated families with FH, who also harbored other FH-related variants that were suspected to cause disease (Rabacchi et al., 2016; Alnouri et al., 20018); In one family, three individuals who were heterozygous for the S2429T variant in the APOB gene in addition to at least one pathogenic variant in the LDLR gene had lower LDL-C levels than family members who did not harbor the S2429T variant, leading the authors to hypothesize that the S2429T variant may have an LDL-lowering effect (Rabacchi et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Reported in ClinVar (ClinVar Variant ID#218448; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 33069457, 20657596, 26415676, 27578127, 27153395, 30270081) -

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Apr 18, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:2Benign:1

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 20, 2016

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 28, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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: Few reports, no segs, ExAC: 0.1% (92/66598) European chromosomes -

Hypercholesterolemia, autosomal dominant, type B

Uncertain:2

Oct 30, 2023

Zotz-Klimas Genetics Lab, MVZ Zotz Klimas

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Sep 09, 2019

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Hypercholesterolemia, familial, 1

Uncertain:2

Mar 01, 2016

Laboratory of Genetics and Molecular Cardiology, University of São Paulo

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: research

- -

Mar 06, 2015

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hypercholesterolemia

Uncertain:1

Aug 01, 2016

CSER _CC_NCGL, University of Washington

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: research

Found in patient having exome sequencing for an unrelated indication. No known history hypercholesterolemia. -

Familial hypobetalipoproteinemia 1

Uncertain:1

Sep 09, 2019

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Jan 14, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely 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

Mar 26, 2018

Color Diagnostics, LLC DBA Color Health

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Likely Benign based on current evidence: This missense variant (also known as p.Ser2402Thr in the mature protein) is located in the alpha 2 domain of the APOB protein. Computational prediction tools and conservation analyses are inconclusive regarding the impact of this variant on the protein function. Computational splicing tools suggest that this variant may not impact the RNA splicing. To our knowledge, functional assays have not been performed for this variant. This variant has been reported in a Latvian individual with suspected hypercholesterolemia (PMID: 26415676). In an Italian family with hypercholesterolemia caused by biallelic LDLR mutations, this variant was suggested to have LDL-C lowering effect (PMID: 27578127). This variant has been identified in 136/126166 non-Finnish European chromosomes (0.11%) and 39/10136 Ashkenazi Jewish chromosomes (0.38%) in the general population by the Genome Aggregation Database (gnomAD). This variant allele frequency is greater than expected for the disorder based on prevalence, penetrance, and genetic heterogeneity. Based on available evidence, this variant is classified as Likely Benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.089

BayesDel_addAF

Benign

-0.65

BayesDel_noAF

Benign

-0.74

CADD

Benign

DANN

Benign

0.92

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.30

FATHMM_MKL

Benign

0.22

M_CAP

Benign

0.0064

MetaRNN

Benign

0.0077

MetaSVM

Benign

-0.96

PrimateAI

Benign

0.34

PROVEAN

Benign

-1.6

REVEL

Benign

0.056

Sift

Benign

0.23

Sift4G

Uncertain

0.0030

Vest4

0.23

MVP

0.52

MPC

0.076

ClinPred

0.023

GERP RS

2.9

gMVP

0.21

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