rs142253670

Positions:

chr1-94008252-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM1PM5PP3_ModeratePP5_Very_Strong

The NM_000350.3(ABCA4):c.5881G>A(p.Gly1961Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000774 in 1,614,086 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. G1961E) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000077 ( 0 hom. )

Consequence

ABCA4
NM_000350.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 7.64

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:

ABCA4 (HGNC:):

ABCA4 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 5 uncertain in NM_000350.3

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-94008251-C-T is described in ClinVar as [other]. Clinvar id is 7888.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic_low_penetrance=1, not_provided=3, Pathogenic=30, Benign=1, Likely_pathogenic=11}.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.851

PP5

Variant 1-94008252-C-T is Pathogenic according to our data. Variant chr1-94008252-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 236140.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-94008252-C-T is described in Lovd as [Pathogenic]. Variant chr1-94008252-C-T is described in Lovd as [Likely_pathogenic]. Variant chr1-94008252-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ABCA4	NM_000350.3 linkuse as main transcript	c.5881G>A	p.Gly1961Arg	missense_variant	42/50	ENST00000370225.4	NP_000341.2	P78363Q6AI28
ABCA4	XM_047416704.1 linkuse as main transcript	c.5659G>A	p.Gly1887Arg	missense_variant	41/49

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ABCA4	ENST00000370225.4 linkuse as main transcript	c.5881G>A	p.Gly1961Arg	missense_variant	42/50	1	NM_000350.3	ENSP00000359245.3		P78363
ABCA4	ENST00000465352.1 linkuse as main transcript	n.297G>A		non_coding_transcript_exon_variant	3/6	5

Frequencies

GnomAD3 genomes

AF:

0.0000855

AC:

AN:

152106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000772

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000915

AC:

AN:

251456

Hom.:

AF XY:

0.0000809

AC XY:

AN XY:

135906

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000217

Gnomad SAS exome

AF:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000106

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000766

AC:

112

AN:

1461862

Hom.:

Cov.:

AF XY:

0.0000825

AC XY:

AN XY:

727228

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000126

Gnomad4 SAS exome

AF:

0.000104

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000818

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.0000854

AC:

AN:

152224

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74442

show subpopulations

Gnomad4 AFR

AF:

0.0000722

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000774

Gnomad4 SAS

AF:

0.000208

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000710

Hom.:

Bravo

AF:

0.0000756

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000824

AC:

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 25, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1961 of the ABCA4 protein (p.Gly1961Arg). This variant is present in population databases (rs142253670, gnomAD 0.02%). This missense change has been observed in individual(s) with autosomal recessive Stargardt disease (PMID: 19074458, 23755871, 26780318, 28118664). 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: 236140). 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%. This variant disrupts the p.Gly1961 amino acid residue in ABCA4. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 19074458, 28181551, 28559085, 30060493). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Oct 20, 2020	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25525159, 23755871, 32090030, 33090715, 26780318, 31589614, 28118664, 19074458) -

Severe early-childhood-onset retinal dystrophy

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Jan 01, 2016

- -

ABCA4-related disorder

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Oct 24, 2018

The ABCA4 c.5881G>A (p.Gly1961Arg) missense variant has been reported in three studies in which it is found in a total of three individuals with Stargardt disease in a compound heterozygous state, in two with a frameshift variant on the second allele and in one with a missense variant on the second allele (Cideciyan et al. 2009; Riveiro-Alvarez et al. 2013; Jiang et al. 2016). The variant has not been reported in the literature in any other conditions potentially associated with variants in the ABCA4 gene. The p.Gly1961Arg variant was absent from 100 control individuals, but is reported at a frequency of 0.00024 in the South Asian population of the Exome Aggregation Consortium. Based on the evidence, the p.Gly1961Arg variant is classified as likely pathogenic for Stargardt disease. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Retinal dystrophy

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics, Univ. Regensburg, Univ. Regensburg

Jan 01, 2015

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.86

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.42

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.75

D;D

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

D;D

M_CAP

Uncertain

0.22

MetaRNN

Pathogenic

0.85

D;D

MetaSVM

Uncertain

0.73

MutationAssessor

Benign

0.30

.;N

PrimateAI

Pathogenic

0.82

PROVEAN

Pathogenic

-6.8

.;D

REVEL

Pathogenic

0.78

Sift

Uncertain

0.0010

.;D

Sift4G

Pathogenic

0.0010

D;D

Polyphen

1.0

.;D

Vest4

0.95

MutPred

0.85

.;Loss of catalytic residue at V1962 (P = 0.0789);

MVP

0.96

MPC

0.51

ClinPred

0.93

GERP RS

5.3

Varity_R

0.92

gMVP

0.96

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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