rs793888519

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 1P and 5B. PM4_SupportingBP6BS2

The NM_000384.3(APOB):c.6639_6641delTGA(p.Asp2213del) variant causes a disruptive 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 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:15

Conservation

PhyloP100: 2.98

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

hypercholesterolemia, autosomal dominant, type B
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae), ClinGen, Ambry Genetics
familial hypobetalipoproteinemia 1
Inheritance: AR, AD, SD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen
homozygous familial hypercholesterolemia
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

APOB links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -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 VariationId is 180280.

BS2

High Homozygotes in GnomAd4 at 2 AD,AR,SD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000384.3. 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
	APOB	NM_000384.3	MANE Select	c.6639_6641delTGA	p.Asp2213del	disruptive_inframe_deletion	Exon 26 of 29	NP_000375.3

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	APOB	ENST00000233242.5	TSL:1 MANE Select	c.6639_6641delTGA	p.Asp2213del	disruptive_inframe_deletion	Exon 26 of 29	ENSP00000233242.1

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

GnomAD2 exomes

AF:

0.00490

AC:

1069

AN:

217994

AF XY:

0.00508

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 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

African (AFR)

AF:

0.000353

AC:

AN:

31170

American (AMR)

AF:

0.00121

AC:

AN:

36260

Ashkenazi Jewish (ASJ)

AF:

0.00136

AC:

AN:

24290

East Asian (EAS)

AF:

0.0000256

AC:

AN:

38994

South Asian (SAS)

AF:

0.00181

AC:

142

AN:

78434

European-Finnish (FIN)

AF:

0.0191

AC:

947

AN:

49614

Middle Eastern (MID)

AF:

0.000182

AC:

AN:

5492

European-Non Finnish (NFE)

AF:

0.00402

AC:

4372

AN:

1087144

Other (OTH)

AF:

0.00346

AC:

201

AN:

58058

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.449

Heterozygous variant carriers

253

507

760

1014

1267

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

136

272

408

544

680

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00416

AC:

633

AN:

152262

Hom.:

Cov.:

AF XY:

0.00442

AC XY:

329

AN XY:

74446

show subpopulations

African (AFR)

AF:

0.000650

AC:

AN:

41556

American (AMR)

AF:

0.000981

AC:

AN:

15298

Ashkenazi Jewish (ASJ)

AF:

0.000577

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00228

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.0170

AC:

180

AN:

10604

Middle Eastern (MID)

AF:

0.00342

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00573

AC:

390

AN:

68014

Other (OTH)

AF:

0.00332

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

104

139

174

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00525

Hom.:

Bravo

AF:

0.00251

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hypercholesterolemia, familial, 1 (7)

not provided (4)

Familial hypercholesterolemia (2)

not specified (2)

APOB-related disorder (1)

Cardiovascular phenotype (1)

Hypercholesterolemia, autosomal dominant, type B (1)

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

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.0

Mutation Taster

=43/57

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over