rs61751403

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM5PP3_StrongPP5_Very_Strong

The NM_000350.3(ABCA4):c.4919G>A(p.Arg1640Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000018 in 1,614,020 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1640W) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

ABCA4
NM_000350.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:10U:1O:1

Conservation

PhyloP100: 6.14

Variant links:

Genes affected

ABCA4 (HGNC:34): (ATP binding cassette subfamily A member 4) 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. This protein is a retina-specific ABC transporter with N-retinylidene-PE as a substrate. It is expressed exclusively in retina photoreceptor cells, and the gene product mediates transport of an essental molecule, all-trans-retinal aldehyde (atRAL), across the photoreceptor cell membrane. Mutations in this gene are found in patients diagnosed with Stargardt disease, a form of juvenile-onset macular degeneration. Mutations in this gene are also associated with retinitis pigmentosa-19, cone-rod dystrophy type 3, early-onset severe retinal dystrophy, fundus flavimaculatus, and macular degeneration age-related 2. [provided by RefSeq, Sep 2019]

ABCA4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-94021340-G-A is described in ClinVar as [Likely_pathogenic, other]. Clinvar id is 99330.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.981

PP5

Variant 1-94021339-C-T is Pathogenic according to our data. Variant chr1-94021339-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 99331.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-94021339-C-T is described in Lovd as [Likely_pathogenic]. Variant chr1-94021339-C-T is described in Lovd as [Likely_pathogenic]. Variant chr1-94021339-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCA4	NM_000350.3 linkuse as main transcript	c.4919G>A	p.Arg1640Gln	missense_variant	35/50	ENST00000370225.4
ABCA4	XM_047416704.1 linkuse as main transcript	c.4697G>A	p.Arg1566Gln	missense_variant	34/49

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris
ABCA4	ENST00000370225.4 linkuse as main transcript	c.4919G>A	p.Arg1640Gln	missense_variant	35/50	1	NM_000350.3	P1
ABCA4	ENST00000460514.1 linkuse as main transcript	n.413G>A		non_coding_transcript_exon_variant	6/7	5
ABCA4	ENST00000470771.1 linkuse as main transcript	n.29G>A		non_coding_transcript_exon_variant	1/2	3

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152134

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000318

AC:

AN:

251428

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135884

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000178

AC:

AN:

1461886

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000894

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000153

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152134

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74314

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000347

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.0000576

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:10Uncertain:1Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:4Other:1

Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 27, 2015	- -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2020	- -
not provided, no classification provided	literature only	Retina International	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 22, 2021	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Published functional studies demonstrate that the c.4919 G>A variant may have a negative effect on proper splicing (Schulz et al., 2017); This variant is associated with the following publications: (PMID: 26743751, 11527935, 11379881, 10711710, 23755871, 26377081, 26103963, 25082885, 19074458, 28118664, 28041643, 29925512, 31736247, 31456290, 30718709, 32581362, 31589614, 32037395) -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jan 10, 2024	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 1640 of the ABCA4 protein (p.Arg1640Gln). This variant is present in population databases (rs61751403, gnomAD 0.009%). This missense change has been observed in individuals with autosomal recessive ABCA4-related conditions (PMID: 10711710, 11527935, 23755871, 26103963). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 99331). 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 expected to disrupt ABCA4 protein function with a positive predictive value of 95%. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. For these reasons, this variant has been classified as Pathogenic. -

Severe early-childhood-onset retinal dystrophy

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing;in vitro	Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg	Jan 01, 2016	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Molecular Genetics, University of Zurich	Jan 30, 2021	- -

Stargardt disease

Pathogenic:2

Pathogenic, no assertion criteria provided	research	Department of Clinical Genetics, Copenhagen University Hospital, Rigshospitalet	Apr 01, 2018	- -
Pathogenic, no assertion criteria provided	research	Sharon lab, Hadassah-Hebrew University Medical Center	Jun 23, 2019	- -

Retinal dystrophy

Pathogenic:1Uncertain:1

Pathogenic, criteria provided, single submitter	clinical testing	Blueprint Genetics	Apr 25, 2019	- -
Uncertain significance, no assertion criteria provided	research	NIHR Bioresource Rare Diseases, University of Cambridge	Jan 01, 2015	- -

Cone-rod dystrophy 3

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen

Apr 21, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.32

BayesDel_addAF

Pathogenic

0.25

BayesDel_noAF

Pathogenic

0.31

Cadd

Pathogenic

Dann

Pathogenic

1.0

DEOGEN2

Uncertain

0.70

D;D

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.95

D;D

M_CAP

Pathogenic

0.34

MetaRNN

Pathogenic

0.98

D;D

MetaSVM

Uncertain

0.036

MutationTaster

Benign

1.0

PrimateAI

Benign

0.39

Sift4G

Benign

0.098

T;T

Polyphen

1.0

.;D

Vest4

0.96

MutPred

0.92

.;Loss of methylation at R1640 (P = 0.052);

MVP

0.94

MPC

0.50

ClinPred

0.89

GERP RS

5.4

Varity_R

0.41

gMVP

0.87

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.56

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.56

Position offset: -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