Variant chr11-116835851-A-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000039.3(APOA1):c.761T>G(p.Leu254Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,460,794 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. L254L) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

APOA1
NM_000039.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.0850

Variant links:

Genes affected

APOA1 (HGNC:600): (apolipoprotein A1) This gene encodes apolipoprotein A-I, which is the major protein component of high density lipoprotein (HDL) in plasma. The encoded preproprotein is proteolytically processed to generate the mature protein, which promotes cholesterol efflux from tissues to the liver for excretion, and is a cofactor for lecithin cholesterolacyltransferase (LCAT), an enzyme responsible for the formation of most plasma cholesteryl esters. This gene is closely linked with two other apolipoprotein genes on chromosome 11. Defects in this gene are associated with HDL deficiencies, including Tangier disease, and with systemic non-neuropathic amyloidosis. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein. [provided by RefSeq, Dec 2015]

APOA1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APOA1	NM_000039.3 linkuse as main transcript	c.761T>G	p.Leu254Arg	missense_variant	4/4	ENST00000236850.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APOA1	ENST00000236850.5 linkuse as main transcript	c.761T>G	p.Leu254Arg	missense_variant	4/4	1	NM_000039.3	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000120

AC:

AN:

249214

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

135482

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000267

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1460794

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726714

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000247

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 17, 2023

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt APOA1 protein function. This variant has not been reported in the literature in individuals affected with APOA1-related conditions. This variant is present in population databases (rs775381241, gnomAD 0.003%). This sequence change replaces leucine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 254 of the APOA1 protein (p.Leu254Arg). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.049

BayesDel_noAF

Benign

-0.25

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.17

T;T;T;T;T

Eigen

Benign

-0.52

Eigen_PC

Benign

-0.76

FATHMM_MKL

Benign

0.090

LIST_S2

Benign

0.62

.;.;T;.;T

M_CAP

Benign

0.058

MetaRNN

Uncertain

0.46

T;T;T;T;T

MetaSVM

Benign

-0.74

MutationAssessor

Uncertain

2.5

M;M;.;M;M

MutationTaster

Benign

1.0

N;N;N;N;N

PrimateAI

Benign

0.30

PROVEAN

Benign

-1.3

N;N;N;N;N

REVEL

Uncertain

0.33

Sift

Uncertain

0.010

D;D;D;D;D

Sift4G

Uncertain

0.021

D;D;D;D;D

Polyphen

0.90

P;P;.;P;P

Vest4

0.57

MutPred

0.41

Gain of methylation at L254 (P = 0.0216);Gain of methylation at L254 (P = 0.0216);.;Gain of methylation at L254 (P = 0.0216);Gain of methylation at L254 (P = 0.0216);

MVP

0.87

MPC

1.7

ClinPred

0.79

GERP RS

-3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.38

gMVP

0.59

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