11-116820880-G-A

Variant names:

• chr11-116820880-G-A
• rs1352011550
• NM_000482.4:c.1178C>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000482.4(APOA4):​c.1178C>T​(p.Pro393Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000558 in 1,613,870 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000060 (0 hom.)
• Consequence: APOA4 NM_000482.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.59

Genes affected

APOA4 (HGNC:602): (apolipoprotein A4) Apoliprotein (apo) A-IV gene contains 3 exons separated by two introns. A sequence polymorphism has been identified in the 3'UTR of the third exon. The primary translation product is a 396-residue preprotein which after proteolytic processing is secreted its primary site of synthesis, the intestine, in association with chylomicron particles. Although its precise function is not known, apo A-IV is a potent activator of lecithin-cholesterol acyltransferase in vitro. [provided by RefSeq, Jul 2008]

ENSG00000285513 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37039107).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APOA4	NM_000482.4	c.1178C>T	p.Pro393Leu	missense_variant	Exon 3 of 3	ENST00000357780.5	NP_000473.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APOA4	ENST00000357780.5	c.1178C>T	p.Pro393Leu	missense_variant	Exon 3 of 3	1	NM_000482.4	ENSP00000350425.3
ENSG00000285513	ENST00000645414.1	n.168+68G>A		intron_variant	Intron 1 of 1
ENSG00000305923	ENST00000814126.1	n.135+6540G>A		intron_variant	Intron 1 of 1

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000319 AC: 8 AN: 251164 AF XY: 0.0000221

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.0000993

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000528

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000595 AC: 87 AN: 1461670 Hom.: 0 Cov.: 66 AF XY: 0.0000523 AC XY: 38 AN XY: 727118

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86180

European-Finnish (FIN) AF: 0.0000187 AC: 1 AN: 53356

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5736

European-Non Finnish (NFE) AF: 0.0000746 AC: 83 AN: 1111982

Other (OTH) AF: 0.0000331 AC: 2 AN: 60386

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152200 Hom.: 0 Cov.: 33 AF XY: 0.0000404 AC XY: 3 AN XY: 74346

African (AFR) AF: 0.00 AC: 0 AN: 41442

American (AMR) AF: 0.00 AC: 0 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5196

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10622

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68032

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.0000564 Hom.: 0

Bravo AF: 0.00000756

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

May 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 393 of the APOA4 protein (p.Pro393Leu). This variant is present in population databases (no rsID available, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with APOA4-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.085	T
BayesDel_noAF	Benign	-0.18
CADD	Benign	18
DANN	Uncertain	0.98
Eigen	Benign	0.070
Eigen_PC	Benign	-0.071
FATHMM_MKL	Benign	0.33	N
M_CAP	Benign	0.058	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-0.41	T
PhyloP100		2.6
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-1.4	N
REVEL	Uncertain	0.32
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.46
MutPred		0.22		Gain of helix (P = 0.0082);
MVP		0.77
MPC		0.052
ClinPred		0.50	T
GERP RS		3.8
gMVP		0.25
Mutation Taster		=98/2	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

Publications

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Other links and lift over

dbSNP: rs1352011550; hg19: chr11-116691596; COSMIC: COSV63360187;