1-68439683-TA-T

Position:

chr1-68439683-TA-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4BS1BP7

This summary comes from the ClinGen Evidence Repository: The c.644-42del variant in RPE65, is an intronic variant which is present outside of consensus splice sites. The splicing impact predictor SpliceAI gives a delta score of 0.09, which is below the ClinGen LCA / eoRD VCEP recommended threshold of <0.1 and does not predict an impact on splicing (BP4, BP7). In addition, the PhyloP score was -2.63 which is below the ClinGen LCA / eoRD VCEP recommended threshold of <0.1, which depicts that the nucleotide is not highly conserved. This intronic variant is present in gnomAD v.2.1.1 at a GrpMax allele frequency of 0.000827, with 26/24712 in the African/ African-American population, which is higher than the ClinGen LCA / eoRD VCEP BS1 threshold of >0.0008 (BS1). In summary this variant meets criteria to be classified as Likely Benign for Leber congenital amaurosis (RPE65) based on the ACMG/AMP criteria (codes met: BP4, BP7, BS1). (VCEP specifications version 1.0.0; date of approval 09/21/2023). LINK:https://erepo.genome.network/evrepo/ui/classification/CA226572/MONDO:0100368/120

Frequency

Genomes: 𝑓 0.00040 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00025 ( 0 hom. )

Consequence

RPE65
NM_000329.3 intron

Scores

Not classified

Clinical Significance

Likely benign reviewed by expert panel B:2O:1

Conservation

PhyloP100: -2.55

Variant links:

Genes affected

RPE65 (HGNC:10294): (retinoid isomerohydrolase RPE65) The protein encoded by this gene is a component of the vitamin A visual cycle of the retina which supplies the 11-cis retinal chromophore of the photoreceptors opsin visual pigments. It is a member of the carotenoid cleavage oxygenase superfamily. All members of this superfamily are non-heme iron oxygenases with a seven-bladed propeller fold and oxidatively cleave carotenoid carbon:carbon double bonds. However, the protein encoded by this gene has acquired a divergent function that involves the concerted O-alkyl ester cleavage of its all-trans retinyl ester substrate and all-trans to 11-cis double bond isomerization of the retinyl moiety. As such, it performs the essential enzymatic isomerization step in the synthesis of 11-cis retinal. Mutations in this gene are associated with early-onset severe blinding disorders such as Leber congenital. [provided by RefSeq, Oct 2017]

RPE65 links:

LOC124904198 (HGNC:):

LOC124904198 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

For more information check the summary or visit ClinGen Evidence Repository.

BP7

For more information check the summary or visit ClinGen Evidence Repository.

BS1

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RPE65	NM_000329.3 linkuse as main transcript	c.644-42delT		intron_variant		ENST00000262340.6	NP_000320.1	Q16518

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RPE65	ENST00000262340.6 linkuse as main transcript	c.644-42delT		intron_variant		1	NM_000329.3	ENSP00000262340.5		Q16518

Frequencies

GnomAD3 genomes

AF:

0.000401

AC:

AN:

152056

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000749

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000525

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.00143

GnomAD3 exomes

AF:

0.000317

AC:

AN:

249042

Hom.:

AF XY:

0.000237

AC XY:

AN XY:

134804

show subpopulations

Gnomad AFR exome

AF:

0.00125

Gnomad AMR exome

AF:

0.000757

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:

0.000249

Gnomad OTH exome

AF:

0.000826

GnomAD4 exome

AF:

0.000247

AC:

338

AN:

1370198

Hom.:

Cov.:

AF XY:

0.000226

AC XY:

155

AN XY:

687092

show subpopulations

Gnomad4 AFR exome

AF:

0.00125

Gnomad4 AMR exome

AF:

0.000697

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000119

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000187

Gnomad4 OTH exome

AF:

0.000279

GnomAD4 genome

AF:

0.000401

AC:

AN:

152174

Hom.:

Cov.:

AF XY:

0.000403

AC XY:

AN XY:

74418

show subpopulations

Gnomad4 AFR

AF:

0.000747

Gnomad4 AMR

AF:

0.000524

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000250

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.000174

Hom.:

Bravo

AF:

0.000453

ClinVar

Significance: Likely benign

Submissions summary: Benign:2Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

RPE65-related recessive retinopathy

Benign:1

Likely benign, reviewed by expert panel

curation

ClinGen Leber Congenital Amaurosis/early Onset Retinal Dystrophy Variant Curation Expert Panel, ClinGen

Apr 22, 2024

The c.644-42del variant in RPE65, is an intronic variant which is present outside of consensus splice sites. The splicing impact predictor SpliceAI gives a delta score of 0.09, which is below the ClinGen LCA / eoRD VCEP recommended threshold of <0.1 and does not predict an impact on splicing (BP4, BP7). In addition, the PhyloP score was -2.63 which is below the ClinGen LCA / eoRD VCEP recommended threshold of <0.1, which depicts that the nucleotide is not highly conserved. This intronic variant is present in gnomAD v.2.1.1 at a GrpMax allele frequency of 0.000827, with 26/24712 in the African/ African-American population, which is higher than the ClinGen LCA / eoRD VCEP BS1 threshold of >0.0008 (BS1). In summary this variant meets criteria to be classified as Likely Benign for Leber congenital amaurosis (RPE65) based on the ACMG/AMP criteria (codes met: BP4, BP7, BS1). (VCEP specifications version 1.0.0; date of approval 09/21/2023). -

Leber congenital amaurosis 2;C3151086:Retinitis pigmentosa 20

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Counsyl

Nov 20, 2017

- -

not provided

Other:1

not provided, no classification provided

literature only

Retina International

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.090

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