chr1-94008758-A-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1PM2PM5PP3_StrongPP5_Moderate

The NM_000350.3(ABCA4):​c.5828T>C​(p.Leu1943Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1943R) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 32)

Consequence

ABCA4
NM_000350.3 missense

Scores

14
4
1

Clinical Significance

Pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 8.91
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]

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM1
In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 uncertain in NM_000350.3
PM2
Very rare variant in population databases, with high coverage;
PM5
Other missense variant is known to change same aminoacid residue: Variant chr1-94008758-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2023019.Status of the report is criteria_provided_single_submitter, 1 stars.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.982
PP5
Variant 1-94008758-A-G is Pathogenic according to our data. Variant chr1-94008758-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 236139.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr1-94008758-A-G is described in Lovd as [Pathogenic]. Variant chr1-94008758-A-G is described in Lovd as [Likely_pathogenic]. Variant chr1-94008758-A-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE UniProt
ABCA4NM_000350.3 linkuse as main transcriptc.5828T>C p.Leu1943Pro missense_variant 41/50 ENST00000370225.4
ABCA4XM_047416704.1 linkuse as main transcriptc.5606T>C p.Leu1869Pro missense_variant 40/49

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Appris UniProt
ABCA4ENST00000370225.4 linkuse as main transcriptc.5828T>C p.Leu1943Pro missense_variant 41/501 NM_000350.3 P1
ABCA4ENST00000465352.1 linkuse as main transcriptn.244T>C non_coding_transcript_exon_variant 2/65

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD4 exome
Cov.:
31
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

not provided Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingInvitaeJul 19, 2022This missense change has been observed in individuals with clinical features of Stargardt disease or cone-rod dystrophy (PMID: 20647261, 28118664; Invitae). For these reasons, this variant has been classified as Pathogenic. 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. ClinVar contains an entry for this variant (Variation ID: 236139). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 1943 of the ABCA4 protein (p.Leu1943Pro). -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.99
BayesDel_addAF
Pathogenic
0.58
D
BayesDel_noAF
Pathogenic
0.59
CADD
Pathogenic
28
DANN
Uncertain
1.0
DEOGEN2
Uncertain
0.64
D;D
Eigen
Pathogenic
0.87
Eigen_PC
Pathogenic
0.72
FATHMM_MKL
Pathogenic
0.99
D
LIST_S2
Uncertain
0.95
D;D
M_CAP
Pathogenic
0.50
D
MetaRNN
Pathogenic
0.98
D;D
MetaSVM
Pathogenic
1.1
D
MutationAssessor
Pathogenic
4.4
.;H
MutationTaster
Benign
1.0
D;D;D
PrimateAI
Uncertain
0.67
T
PROVEAN
Pathogenic
-6.2
.;D
REVEL
Pathogenic
0.99
Sift
Pathogenic
0.0
.;D
Sift4G
Pathogenic
0.0
D;D
Polyphen
1.0
.;D
Vest4
0.99
MutPred
0.84
.;Loss of stability (P = 0.0071);
MVP
0.99
MPC
0.59
ClinPred
1.0
D
GERP RS
5.1
Varity_R
0.93
gMVP
0.99

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.

Other links and lift over

dbSNP: rs886044755; hg19: chr1-94474314; API