rs61750566

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000350.3(ABCA4):c.5161_5162delAC(p.Thr1721HisfsTer65) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,458,340 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

ABCA4
NM_000350.3 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:5O:2

Conservation

PhyloP100: 0.694

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 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 1-94019615-GGT-G is Pathogenic according to our data. Variant chr1-94019615-GGT-G is described in ClinVar as [Pathogenic]. Clinvar id is 99349.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-94019615-GGT-G is described in Lovd as [Pathogenic]. Variant chr1-94019615-GGT-G is described in Lovd as [Likely_pathogenic]. Variant chr1-94019615-GGT-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCA4	NM_000350.3 link	c.5161_5162delAC	p.Thr1721HisfsTer65	frameshift_variant	Exon 36 of 50	ENST00000370225.4	NP_000341.2	P78363Q6AI28
ABCA4	NM_001425324.1 link	c.4939_4940delAC	p.Thr1647HisfsTer65	frameshift_variant	Exon 35 of 49		NP_001412253.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ABCA4	ENST00000370225.4 link	c.5161_5162delAC	p.Thr1721HisfsTer65	frameshift_variant	Exon 36 of 50	1	NM_000350.3	ENSP00000359245.3	P78363
ABCA4	ENST00000460514.1 link	n.655_656delAC		non_coding_transcript_exon_variant	Exon 7 of 7	5
ABCA4	ENST00000470771.1 link	n.271_272delAC		non_coding_transcript_exon_variant	Exon 2 of 2	3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000817

AC:

AN:

244776

Hom.:

AF XY:

0.00000757

AC XY:

AN XY:

132028

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000181

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000206

AC:

AN:

1458340

Hom.:

AF XY:

0.00000138

AC XY:

AN XY:

724960

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5Other:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3Other:2

Sep 12, 2016

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Thr1721Hisfs*65) in the ABCA4 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ABCA4 are known to be pathogenic (PMID: 10958761, 24938718, 25312043, 26780318). This variant is present in population databases (rs61750566, gnomAD 0.002%). This premature translational stop signal has been observed in individual(s) with Stargardt Disease (PMID: 10090887, 25312043, 25444351, 28041643, 29925512). This variant is also known as 5161delAC. ClinVar contains an entry for this variant (Variation ID: 99349). For these reasons, this variant has been classified as Pathogenic. -

Sep 04, 2015

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.5161_5162delAC deletion in the ABCA4 gene has been reported previously in association with Stargardt disease (Maugeri et al., 1999; Papaioannou et al., 2000; Briggs et al., 2001). The deletion causes a frameshift starting with codon Threonine 1721, changes this amino acid to a Histidine residue and creates a premature Stop codon at position 65 of the new reading frame, denoted p.Thr1721HisfsX65. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. Therefore, we interpret this variant as pathogenic. -

Retina International

Significance: not provided

Review Status: flagged submission

Collection Method: literature only

- -

Retina International

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Severe early-childhood-onset retinal dystrophy

Pathogenic:1

Jan 01, 2015

NIHR Bioresource Rare Diseases, University of Cambridge

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Retinal dystrophy

Pathogenic:1

Jan 12, 2018

Blueprint Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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