NM_005502.4:c.1913G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_005502.4(ABCA1):c.1913G>A(p.Arg638Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000896 in 1,614,152 control chromosomes in the GnomAD database, including 30 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R638W) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00049 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00094 ( 29 hom. )

Consequence

ABCA1
NM_005502.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7

Conservation

PhyloP100: 6.16

Publications

7 publications found

Variant links:

Genes affected

ABCA1 (HGNC:29): (ATP binding cassette subfamily A member 1) The membrane-associated protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intracellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the ABC1 subfamily. Members of the ABC1 subfamily comprise the only major ABC subfamily found exclusively in multicellular eukaryotes. With cholesterol as its substrate, this protein functions as a cholesteral efflux pump in the cellular lipid removal pathway. Mutations in both alleles of this gene cause Tangier disease and familial high-density lipoprotein (HDL) deficiency. [provided by RefSeq, Sep 2019]

ABCA1 Gene-Disease associations (from GenCC):

hypoalphalipoproteinemia, primary, 1
Inheritance: AD Classification: DEFINITIVE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
Tangier disease
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
apolipoprotein A-I deficiency
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ABCA1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.012019634).

BP6

Variant 9-104829118-C-T is Benign according to our data. Variant chr9-104829118-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 364441.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000486 (74/152278) while in subpopulation SAS AF = 0.0135 (65/4830). AF 95% confidence interval is 0.0108. There are 1 homozygotes in GnomAd4. There are 58 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 29 AD,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005502.4. 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
	ABCA1	NM_005502.4	MANE Select	c.1913G>A	p.Arg638Gln	missense	Exon 15 of 50	NP_005493.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
ABCA1	ENST00000374736.8	TSL:1 MANE Select	c.1913G>A	p.Arg638Gln	missense	Exon 15 of 50	ENSP00000363868.3
ABCA1	ENST00000678995.1		c.1913G>A	p.Arg638Gln	missense	Exon 15 of 50	ENSP00000504612.1
ABCA1	ENST00000494467.1	TSL:3	n.86G>A		non_coding_transcript_exon	Exon 2 of 4

Frequencies

GnomAD3 genomes

AF:

0.000493

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.0137

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00186

AC:

466

AN:

251142

AF XY:

0.00261

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000993

Gnomad EAS exome

AF:

0.000598

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000939

AC:

1372

AN:

1461874

Hom.:

Cov.:

AF XY:

0.00140

AC XY:

1017

AN XY:

727234

show subpopulations

African (AFR)

AF:

0.000119

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.000151

AC:

AN:

39700

South Asian (SAS)

AF:

0.0152

AC:

1309

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000108

AC:

AN:

1112006

Other (OTH)

AF:

0.000629

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.468

Heterozygous variant carriers

183

275

366

458

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<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:

0.000486

AC:

AN:

152278

Hom.:

Cov.:

AF XY:

0.000779

AC XY:

AN XY:

74450

show subpopulations

African (AFR)

AF:

0.000144

AC:

AN:

41542

American (AMR)

AF:

0.00

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.000386

AC:

AN:

5178

South Asian (SAS)

AF:

0.0135

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68030

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

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:

0.000149

Hom.:

Bravo

AF:

0.000125

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00206

AC:

250

Asia WGS

AF:

0.00144

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

Dec 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ABCA1: BS1, BS2

not specified

Benign:1

Mar 17, 2025

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

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: ABCA1 c.1913G>A (p.Arg638Gln) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.0019 in 251142 control chromosomes, predominantly at a frequency of 0.015 within the South Asian subpopulation in the gnomAD database, including 10 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 6 fold of the estimated maximal expected allele frequency for a pathogenic variant in ABCA1 causing Tangier Disease phenotype (0.0025). c.1913G>A has been reported in the literature in individuals affected with with decreased serum HDL cholesterol and hypertriglyceridemia, but without without strong evidence for causality (e.g., Abdel-Razek_2018, Cohen_2004, Sadananda_2015, Setia_2020, Suzuki_2024). These report(s) do not provide unequivocal conclusions about association of the variant with Tangier Disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 29150341, 15297675, 26255038, 32044282, 38346769). ClinVar contains an entry for this variant (Variation ID: 364441). Based on the evidence outlined above, the variant was classified as likely benign.

Cardiovascular phenotype

Benign:1

Mar 14, 2025

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.

Tangier disease

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign.

Hypoalphalipoproteinemia, primary, 1

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.064

BayesDel_noAF

Pathogenic

0.15

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.65

Eigen

Pathogenic

0.76

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.93

MetaRNN

Benign

0.012

MetaSVM

Uncertain

0.56

MutationAssessor

Benign

1.7

PhyloP100

6.2

PrimateAI

Uncertain

0.70

PROVEAN

Uncertain

-2.8

REVEL

Pathogenic

0.74

Sift

Uncertain

0.018

Sift4G

Uncertain

0.044

Polyphen

1.0

Vest4

0.82

MVP

0.95

MPC

0.52

ClinPred

0.094

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.58

gMVP

0.77

Mutation Taster

=84/16

polymorphism

(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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over