rs61749440

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_000350.3(ABCA4):c.2690C>T(p.Thr897Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00144 in 1,614,066 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T897T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0013 ( 1 hom., cov: 32)

Exomes 𝑓: 0.0015 ( 6 hom. )

Consequence

ABCA4
NM_000350.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:6B:6O:1

Conservation

PhyloP100: 2.35

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 Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009508371).

BS2

High Homozygotes in GnomAdExome at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCA4	NM_000350.3 linkuse as main transcript	c.2690C>T	p.Thr897Ile	missense_variant	18/50	ENST00000370225.4
ABCA4	XM_047416704.1 linkuse as main transcript	c.2468C>T	p.Thr823Ile	missense_variant	17/49

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCA4	ENST00000370225.4 linkuse as main transcript	c.2690C>T	p.Thr897Ile	missense_variant	18/50	1	NM_000350.3	P1
ABCA4	ENST00000649773.1 linkuse as main transcript	c.2468C>T	p.Thr823Ile	missense_variant	17/19

Frequencies

GnomAD3 genomes

AF:

0.00130

AC:

197

AN:

152070

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000362

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00229

Gnomad ASJ

AF:

0.00576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00179

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.00122

AC:

308

AN:

251454

Hom.:

AF XY:

0.00117

AC XY:

159

AN XY:

135906

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.00107

Gnomad ASJ exome

AF:

0.00417

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000359

Gnomad FIN exome

AF:

0.000370

Gnomad NFE exome

AF:

0.00167

Gnomad OTH exome

AF:

0.00277

GnomAD4 exome

AF:

0.00146

AC:

2129

AN:

1461878

Hom.:

Cov.:

AF XY:

0.00146

AC XY:

1059

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.000329

Gnomad4 AMR exome

AF:

0.000984

Gnomad4 ASJ exome

AF:

0.00566

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000278

Gnomad4 FIN exome

AF:

0.000431

Gnomad4 NFE exome

AF:

0.00158

Gnomad4 OTH exome

AF:

0.00174

GnomAD4 genome

AF:

0.00129

AC:

197

AN:

152188

Hom.:

Cov.:

AF XY:

0.00106

AC XY:

AN XY:

74402

show subpopulations

Gnomad4 AFR

AF:

0.000361

Gnomad4 AMR

AF:

0.00229

Gnomad4 ASJ

AF:

0.00576

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000189

Gnomad4 NFE

AF:

0.00179

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.00184

Hom.:

Bravo

AF:

0.00123

TwinsUK

AF:

0.00216

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.00114

AC:

138

EpiCase

AF:

0.00207

EpiControl

AF:

0.00207

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:6Benign:6Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Uncertain:5Benign:1Other:1

Uncertain significance, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2019	- -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
not provided, no classification provided	literature only	Retina International	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 05, 2019	Reported previously in association with Stargardt disease and cone-rod dystrophy as heterozygous with other ABCA4 variants (Salles et al., 2018) as well as heterozygous without a second variant (Simonelli et al., 2000; Tsipi et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 10711710, 11328725, 22995991, 27014590, 22264887, 21911583, 26103963, 30093795, 28118664, 29178665, 11702214, 29925512, 18161617) -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Sep 14, 2016	- -
Uncertain significance, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 31, 2024	- -

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

- -

Age related macular degeneration 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Oct 11, 2018

This variant was classified as: Uncertain significance. The available evidence favors the benign nature of this variant, however the evidence is insufficent to prove its benign nature. The following ACMG criteria were applied in classifying this variant: BP6. -

Retinitis Pigmentosa, Recessive

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Stargardt Disease, Recessive

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

ABCA4-Related Disorders

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Cone-Rod Dystrophy, Recessive

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Macular degeneration

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.27

BayesDel_addAF

Uncertain

0.047

BayesDel_noAF

Pathogenic

0.29

Cadd

Benign

Dann

Uncertain

0.99

DEOGEN2

Uncertain

0.45

T;.

Eigen

Uncertain

0.24

Eigen_PC

Uncertain

0.32

FATHMM_MKL

Benign

0.70

LIST_S2

Benign

0.73

T;T

M_CAP

Benign

0.027

MetaRNN

Benign

0.0095

T;T

MetaSVM

Uncertain

0.10

MutationAssessor

Benign

1.7

L;.

MutationTaster

Benign

0.99

D;N

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-1.7

N;.

REVEL

Uncertain

0.62

Sift

Benign

0.19

T;.

Sift4G

Benign

0.20

T;.

Polyphen

0.054

B;.

Vest4

0.80

MVP

0.94

MPC

0.30

ClinPred

0.022

GERP RS

5.3

Varity_R

0.11

gMVP

0.67

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.

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