chr1-94029465-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 13P and 1B. PM1PM5PP3PP5_Very_StrongBP4

The NM_000350.3(ABCA4):c.4519G>A(p.Gly1507Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000327 in 1,561,378 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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. G1507W) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

ABCA4
NM_000350.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:9U:1

Conservation

PhyloP100: 7.77

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 12 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 10 uncertain in NM_000350.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-94029465-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1284272.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

Multiple lines of computational evidence support a deleterious effect 9: AlphaMissense, BayesDel_addAF, BayesDel_noAF, Dann, Eigen, M_CAP, phyloP100way_vertebrate, PROVEAN, REVEL [when max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

PP5

Variant 1-94029465-C-T is Pathogenic according to our data. Variant chr1-94029465-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 236115.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-94029465-C-T is described in Lovd as [Likely_pathogenic]. Variant chr1-94029465-C-T is described in Lovd as [Pathogenic].

BP4

Computational evidence support a benign effect (MetaRNN=0.4059631). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCA4	NM_000350.3 link	c.4519G>A	p.Gly1507Arg	missense_variant	Exon 30 of 50	ENST00000370225.4	NP_000341.2	P78363Q6AI28
ABCA4	NM_001425324.1 link	c.4297G>A	p.Gly1433Arg	missense_variant	Exon 29 of 49		NP_001412253.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCA4	ENST00000370225.4 link	c.4519G>A	p.Gly1507Arg	missense_variant	Exon 30 of 50	1	NM_000350.3	ENSP00000359245.3		P78363

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152178

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000162

AC:

AN:

172758

Hom.:

AF XY:

0.000164

AC XY:

AN XY:

91606

show subpopulations

Gnomad AFR exome

AF:

0.0000951

Gnomad AMR exome

AF:

0.000959

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:

0.0000145

Gnomad OTH exome

AF:

0.000211

GnomAD4 exome

AF:

0.0000305

AC:

AN:

1409082

Hom.:

Cov.:

AF XY:

0.0000302

AC XY:

AN XY:

696040

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000650

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000268

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000148

Gnomad4 OTH exome

AF:

0.0000343

GnomAD4 genome

AF:

0.0000525

AC:

AN:

152296

Hom.:

Cov.:

AF XY:

0.0000806

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.0000481

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000680

ExAC

AF:

0.0000503

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:9Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Severe early-childhood-onset retinal dystrophy

Pathogenic:3

Likely pathogenic, no assertion criteria provided	research	NIHR Bioresource Rare Diseases, University of Cambridge	Jan 01, 2015	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg	Jan 01, 2016	- -
Pathogenic, no assertion criteria provided	research	Ophthalmo-Genetics Lab, Instituto de Oftalmologia Conde de Valenciana	-	- -

Retinal dystrophy

Pathogenic:2Uncertain:1

Pathogenic, criteria provided, single submitter	clinical testing	Blueprint Genetics	Feb 28, 2019	- -
Uncertain significance, flagged submission	research	Dept Of Ophthalmology, Nagoya University	Oct 01, 2023	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg	Jan 01, 2017	- -

ABCA4-related disorder

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Sep 04, 2024

The ABCA4 c.4519G>A variant is predicted to result in the amino acid substitution p.Gly1507Arg. This variant has been reported in the compound heterozygous state in multiple individuals with ABCA4-related retinal disease (see for examples: Fujinami et al. 2013. PubMed ID: 23499370; Table S1, Ścieżyńska et al 2015. PubMed ID: 26593885; Table S1, Del Pozo-Valero et al. 2020. PubMed ID: 32619608; Table S1, Lin et al. 2024. PubMed ID: 38219857). This variant is reported in 0.10% of alleles in individuals of Latino descent in gnomAD. Given the evidence, we interpret this variant as pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 12, 2024

This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1507 of the ABCA4 protein (p.Gly1507Arg). This variant is present in population databases (rs568792949, gnomAD 0.1%). This missense change has been observed in individual(s) with Stargardt disease (PMID: 23499370, 26593885, 27030965, 28041643). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 236115). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt ABCA4 protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

Severe early-childhood-onset retinal dystrophy;C1858806:Cone-rod dystrophy 3;C1866422:Retinitis pigmentosa 19;C3495438:Age related macular degeneration 2

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 01, 2024

- -

Stargardt disease

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

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

Oct 30, 2023

Variant summary: ABCA4 c.4519G>A (p.Gly1507Arg) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00016 in 172758 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in ABCA4 causing Stargardt Disease (0.00016 vs 0.0014), allowing no conclusion about variant significance. c.4519G>A has been reported in the literature as a biallelic compound heterozygous genotype in individuals affected with Stargardt Disease (example, Fujinami_2013, Huckfeldt_2016, Lambertus_2016, Klufas_2018). These data indicate that the variant is likely to be associated with 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: 28041643, 23499370, 27030965, 32307445, 28248825, 27699414, 26593885). Four submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.83

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.53

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.46

T;D

Eigen

Pathogenic

0.82

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

1.0

D;D

M_CAP

Pathogenic

0.62

MetaRNN

Benign

0.41

T;T

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.6

.;M

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-6.6

D;D

REVEL

Pathogenic

0.79

Sift

Pathogenic

0.0

D;D

Sift4G

Uncertain

0.0020

D;D

Polyphen

1.0

.;D

Vest4

0.90

MutPred

0.26

.;Gain of methylation at G1507 (P = 0.0171);

MVP

0.98

MPC

0.51

ClinPred

0.89

GERP RS

5.4

Varity_R

0.67

gMVP

0.76

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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