rs61743502

Variant names:

• chr2-21002628-A-G
• rs61743502
• NM_000384.3:c.12794T>C

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_000384.3(APOB):​c.12794T>C​(p.Val4265Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00856 in 1,613,992 control chromosomes in the GnomAD database, including 84 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V4265I) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0051 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0089 (83 hom.)
• Consequence: APOB NM_000384.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:14
• Conservation: PhyloP100: 0.415
• Publications: 15 publications found

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

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.003914237).
• BP6: Variant 2-21002628-A-G is Benign according to our data. Variant chr2-21002628-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 237738.
• BS2: High Homozygotes in GnomAdExome4 at 83 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.12794T>C	p.Val4265Ala	missense	Exon 29 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.12794T>C	p.Val4265Ala	missense	Exon 29 of 29	ENSP00000233242.1

Frequencies

GnomAD3 genomes AF: 0.00507 AC: 771 AN: 152196 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00210

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00242

Gnomad ASJ AF: 0.00144

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00455

Gnomad FIN AF: 0.00160

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00872

Gnomad OTH AF: 0.00478

GnomAD2 exomes AF: 0.00507 AC: 1271 AN: 250936 AF XY: 0.00530

Gnomad AFR exome AF: 0.00154

Gnomad AMR exome AF: 0.00278

Gnomad ASJ exome AF: 0.00318

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00194

Gnomad NFE exome AF: 0.00829

Gnomad OTH exome AF: 0.00556

GnomAD4 exome AF: 0.00893 AC: 13046 AN: 1461678 Hom.: 83 Cov.: 35 AF XY: 0.00865 AC XY: 6293 AN XY: 727136

African (AFR) AF: 0.00158 AC: 53 AN: 33462

American (AMR) AF: 0.00277 AC: 124 AN: 44708

Ashkenazi Jewish (ASJ) AF: 0.00260 AC: 68 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00308 AC: 266 AN: 86228

European-Finnish (FIN) AF: 0.00234 AC: 125 AN: 53408

Middle Eastern (MID) AF: 0.000867 AC: 5 AN: 5766

European-Non Finnish (NFE) AF: 0.0107 AC: 11936 AN: 1111898

Other (OTH) AF: 0.00777 AC: 469 AN: 60384

GnomAD4 genome AF: 0.00506 AC: 771 AN: 152314 Hom.: 1 Cov.: 32 AF XY: 0.00450 AC XY: 335 AN XY: 74480

African (AFR) AF: 0.00209 AC: 87 AN: 41568

American (AMR) AF: 0.00242 AC: 37 AN: 15292

Ashkenazi Jewish (ASJ) AF: 0.00144 AC: 5 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00456 AC: 22 AN: 4826

European-Finnish (FIN) AF: 0.00160 AC: 17 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00872 AC: 593 AN: 68020

Other (OTH) AF: 0.00473 AC: 10 AN: 2114

Alfa AF: 0.00735 Hom.: 12

Bravo AF: 0.00489

TwinsUK AF: 0.00944 AC: 35

ALSPAC AF: 0.00986 AC: 38

ESP6500AA AF: 0.00340 AC: 15

ESP6500EA AF: 0.00814 AC: 70

ExAC AF: 0.00513 AC: 623

Asia WGS AF: 0.00144 AC: 6 AN: 3478

EpiCase AF: 0.00878

EpiControl AF: 0.00883

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	6	not provided (6)
-	-	2	Familial hypercholesterolemia (2)
-	-	2	not specified (2)
-	-	1	Cardiovascular phenotype (1)
-	1	-	Familial hypobetalipoproteinemia 1 (1)
-	-	1	Hypercholesterolemia, autosomal dominant, type B (1)
-	-	1	Hypercholesterolemia, autosomal dominant, type B;C4551990:Familial hypobetalipoproteinemia 1 (1)
-	-	1	Hypercholesterolemia, familial, 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.65	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	2.1
DANN	Benign	0.75
Eigen	Benign	-0.91
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.30	N
M_CAP	Benign	0.0087	T
MetaRNN	Benign	0.0039	T
MetaSVM	Benign	-0.90	T
PhyloP100		0.41
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-1.7	N
REVEL	Benign	0.024
Sift	Benign	0.24	T
Sift4G	Uncertain	0.033	D
Vest4		0.064
MVP		0.35
MPC		0.041
ClinPred		0.0031	T
GERP RS		1.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
gMVP		0.38
Mutation Taster		=91/9	polymorphism

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: rs61743502; hg19: chr2-21225500; COSMIC: COSV99028621; COSMIC: COSV99028621;