rs12718465

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000039.3(APOA1):c.181G>A(p.Ala61Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00134 in 1,614,144 control chromosomes in the GnomAD database, including 46 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 Benign (★★).

Frequency

Genomes: 𝑓 0.0014 ( 5 hom., cov: 33)

Exomes 𝑓: 0.0013 ( 41 hom. )

Consequence

APOA1
NM_000039.3 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: -0.289

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:

APOA1-AS (HGNC:40079): (APOA1 antisense RNA)

APOA1-AS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0033324957).

BP6

Variant 11-116837020-C-T is Benign according to our data. Variant chr11-116837020-C-T is described in ClinVar as [Benign]. Clinvar id is 302507.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-116837020-C-T is described in Lovd as [Likely_benign].

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00135 (206/152330) while in subpopulation EAS AF= 0.0378 (196/5186). AF 95% confidence interval is 0.0335. There are 5 homozygotes in gnomad4. There are 108 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 5 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APOA1	NM_000039.3 link	c.181G>A	p.Ala61Thr	missense_variant	Exon 3 of 4	ENST00000236850.5	NP_000030.1	P02647A0A024R3E3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APOA1	ENST00000236850.5 link	c.181G>A	p.Ala61Thr	missense_variant	Exon 3 of 4	1	NM_000039.3	ENSP00000236850.3		P02647

Frequencies

GnomAD3 genomes

AF:

0.00134

AC:

204

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000392

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.0373

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00192

GnomAD3 exomes

AF:

0.00296

AC:

744

AN:

251256

Hom.:

AF XY:

0.00272

AC XY:

369

AN XY:

135898

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0392

Gnomad SAS exome

AF:

0.000229

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00196

GnomAD4 exome

AF:

0.00134

AC:

1958

AN:

1461814

Hom.:

Cov.:

AF XY:

0.00133

AC XY:

964

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.0445

Gnomad4 SAS exome

AF:

0.000267

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000216

Gnomad4 OTH exome

AF:

0.00233

GnomAD4 genome

AF:

0.00135

AC:

206

AN:

152330

Hom.:

Cov.:

AF XY:

0.00145

AC XY:

108

AN XY:

74488

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000392

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.0378

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00190

Alfa

AF:

0.00148

Hom.:

Bravo

AF:

0.00150

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.00284

AC:

345

Asia WGS

AF:

0.0140

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Mar 19, 2021

Genetic Services Laboratory, University of Chicago

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 29, 2018

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: APOA1 c.181G>A (p.Ala61Thr) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0028 in 277088 control chromosomes, predominantly at a frequency of 0.04 within the East Asian subpopulation in the gnomAD database, including 13 homozygotes. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 4000 fold of the estimated maximal expected allele frequency for a pathogenic variant in APOA1 causing Apoliprotein A1 Amyloidosis phenotype (1e-05), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian origin. c.181G>A has been reported in the literature in individuals affected with Apoliprotein A1 deficiency, familial hypercholesterolemia, and Moyamoya disease (Matsunaga_1991, Pek_2017, Shoemaker_2015). These reports do not provide unequivocal conclusions about association of the variant with Apoliprotein A1 Amyloidosis, Apolipoprotein-A1 deficiency or familial hypercholestrolemia. Co-occurrences with other pathogenic variant(s) have been reported (APOA1 c.322C>T, p.Gln108X) in a female patient with apolipoprotein A-I deficiency, providing supporting evidence for a benign role (Matsunaga_1991). In addition, six control individuals who carry this variant showed normal plasma HDL cholesterol and apoA-I (Matsunaga_1991). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. One laboratory classified the variant as likely benign. Based on the evidence outlined above, the variant was classified as benign. -

Familial visceral amyloidosis, Ostertag type

Benign:2

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Dec 05, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hypoalphalipoproteinemia, primary, 2, intermediate

Benign:1

Dec 05, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hypoalphalipoproteinemia, primary, 2

Benign:1

Dec 05, 2021

Genome-Nilou Lab

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Benign:1

Jan 12, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Jan 23, 2020

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as 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. -

Hypoalphalipoproteinemia, primary, 1

Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.57

BayesDel_noAF

Benign

-0.55

CADD

Benign

DANN

Benign

0.75

DEOGEN2

Benign

0.093

T;T;T;T

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.11

LIST_S2

Benign

0.48

.;.;.;T

MetaRNN

Benign

0.0033

T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.1

L;L;L;L

PrimateAI

Benign

0.24

PROVEAN

Benign

-0.20

N;N;N;N

REVEL

Benign

0.042

Sift

Benign

0.67

T;T;T;T

Sift4G

Benign

1.0

T;T;T;T

Polyphen

0.021

B;B;B;B

Vest4

0.25

MVP

0.63

MPC

0.59

ClinPred

0.0023

GERP RS

-4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.090

gMVP

0.11

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