rs190540405

Variant names:

• chr1-94080705-G-A
• rs190540405
• NM_000350.3:c.872C>T

Your query was ambiguous. Multiple possible variants found:

• chr1-94080705-G-A
• chr1-94080705-G-T

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 3P and 4B. PM1 PP2 BP4_Strong

The NM_000350.3(ABCA4):​c.872C>T​(p.Pro291Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000154 in 1,614,084 control chromosomes in the GnomAD database, including 1 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. P291P) has been classified as Likely benign. The gene ABCA4 is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00016 (1 hom.)
• Consequence: ABCA4 NM_000350.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:3 B:1
• Conservation: PhyloP100: 0.414
• Publications: 9 publications found

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 Gene-Disease associations (from GenCC):

• ABCA4-related retinopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• cone-rod dystrophy 3

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
• severe early-childhood-onset retinal dystrophy

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Ambry Genetics
• retinitis pigmentosa 19

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• cone-rod dystrophy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Stargardt disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• age related macular degeneration 2

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

LOC124904222 (HGNC:):

ACMG classification

Specifications for ABCA4 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_benign. The variant received -1 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, 3 uncertain in NM_000350.3
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 578 curated pathogenic missense variants (we use a threshold of 10). The gene has 28 curated benign missense variants. Gene score misZ: -0.65813 (below the threshold of 3.09). Trascript score misZ: 1.3628 (below the threshold of 3.09). GenCC associations: The gene is linked to severe early-childhood-onset retinal dystrophy, retinitis pigmentosa, age related macular degeneration 2, retinitis pigmentosa 19, cone-rod dystrophy 3, ABCA4-related retinopathy, Stargardt disease, cone-rod dystrophy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.015607595).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000350.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCA4	NM_000350.3	MANE Select	c.872C>T	p.Pro291Leu	missense	Exon 8 of 50	NP_000341.2	P78363
	ABCA4	NM_001425324.1		c.872C>T	p.Pro291Leu	missense	Exon 8 of 49	NP_001412253.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCA4	ENST00000370225.4	TSL:1 MANE Select	c.872C>T	p.Pro291Leu	missense	Exon 8 of 50	ENSP00000359245.3	P78363
	ABCA4	ENST00000649773.1		c.872C>T	p.Pro291Leu	missense	Exon 8 of 19	ENSP00000496882.1	A0A3B3IRV8

Frequencies

GnomAD3 genomes AF: 0.000112 AC: 17 AN: 152078 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000327

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000643 AC: 161 AN: 250402 AF XY: 0.000480

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00387

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000976

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000159 AC: 232 AN: 1461888 Hom.: 1 Cov.: 32 AF XY: 0.000149 AC XY: 108 AN XY: 727244

African (AFR) AF: 0.0000299 AC: 1 AN: 33480

American (AMR) AF: 0.00300 AC: 134 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.000126 AC: 5 AN: 39696

South Asian (SAS) AF: 0.000417 AC: 36 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.0000441 AC: 49 AN: 1112012

Other (OTH) AF: 0.000116 AC: 7 AN: 60396

GnomAD4 genome AF: 0.000112 AC: 17 AN: 152196 Hom.: 0 Cov.: 32 AF XY: 0.000175 AC XY: 13 AN XY: 74400

African (AFR) AF: 0.00 AC: 0 AN: 41522

American (AMR) AF: 0.000327 AC: 5 AN: 15288

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.000193 AC: 1 AN: 5180

South Asian (SAS) AF: 0.000416 AC: 2 AN: 4812

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10586

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.000132 AC: 9 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2114

Alfa AF: 0.000110 Hom.: 0

Bravo AF: 0.000287

ExAC AF: 0.000535 AC: 65

Asia WGS AF: 0.000866 AC: 3 AN: 3478

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	2	1	not provided (3)
1	1	-	Retinal dystrophy (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.041	T
BayesDel_noAF	Pathogenic	0.17
CADD	Benign	18
DANN	Benign	0.83
DEOGEN2	Uncertain	0.67	D
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.34
FATHMM_MKL	Benign	0.53	D
LIST_S2	Benign	0.80	T
M_CAP	Uncertain	0.25	D
MetaRNN	Benign	0.016	T
MetaSVM	Benign	-0.49	T
MutationAssessor	Benign	1.0	L
PhyloP100		0.41
PrimateAI	Benign	0.32	T
PROVEAN	Uncertain	-3.0	D
REVEL	Uncertain	0.56
Sift	Benign	0.076	T
Sift4G	Benign	0.091	T
Polyphen		0.93	P
Vest4		0.76
MVP		0.93
MPC		0.23
ClinPred		0.043	T
GERP RS		3.8
Varity_R		0.077
gMVP		0.65
Mutation Taster		=76/24	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs190540405; hg19: chr1-94546261;