1-68431318-C-G

Variant names:

• chr1-68431318-C-G
• rs62636301
• NM_000329.3:c.1302G>C

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_000329.3(RPE65):​c.1302G>C​(p.Ala434Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00154 in 1,613,908 control chromosomes in the GnomAD database, including 34 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. A434A) has been classified as Benign. The gene RPE65 is included in the ClinGen Criteria Specification Registry.

• Frequency:
  • Genomes: 𝑓 0.0083 (17 hom., cov: 32)
  • Exomes 𝑓: 0.00084 (17 hom.)
• Consequence: RPE65 NM_000329.3 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7 O:1
• Conservation: PhyloP100: -5.43
• Publications: 3 publications found

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 Gene-Disease associations (from GenCC):

• Leber congenital amaurosis 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• retinitis pigmentosa

  Inheritance: AR, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• RPE65-related recessive retinopathy

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, PanelApp Australia, Ambry Genetics
• RPE65-related dominant retinopathy

  Inheritance: AD Classification: STRONG Submitted by: ClinGen, PanelApp Australia
• retinitis pigmentosa 20

  Inheritance: AR, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• Leber congenital amaurosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• severe early-childhood-onset retinal dystrophy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• retinitis pigmentosa 87 with choroidal involvement

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

LOC124904198 (HGNC:):

ACMG classification

Specifications for RPE65 are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Benign. The variant received -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.78).
• BP6: Variant 1-68431318-C-G is Benign according to our data. Variant chr1-68431318-C-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 98837.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=-5.43 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00829 (1262/152246) while in subpopulation AFR AF = 0.0286 (1188/41528). AF 95% confidence interval is 0.0273. There are 17 homozygotes in GnomAd4. There are 656 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 17 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000329.3. 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
	RPE65	NM_000329.3	MANE Select	c.1302G>C	p.Ala434Ala	synonymous	Exon 12 of 14	NP_000320.1	Q16518
	RPE65	NM_001406853.1		c.1194G>C	p.Ala398Ala	synonymous	Exon 11 of 13	NP_001393782.1
	RPE65	NM_001406856.1		c.1026G>C	p.Ala342Ala	synonymous	Exon 11 of 13	NP_001393785.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RPE65	ENST00000262340.6	TSL:1 MANE Select	c.1302G>C	p.Ala434Ala	synonymous	Exon 12 of 14	ENSP00000262340.5	Q16518
	RPE65	ENST00000713936.1		n.*1207G>C		non_coding_transcript_exon	Exon 13 of 15	ENSP00000519233.1	A0AAQ5BH58
	RPE65	ENST00000713937.1		n.*450G>C		non_coding_transcript_exon	Exon 11 of 13	ENSP00000519234.1	A0AAQ5BH46

Frequencies

GnomAD3 genomes AF: 0.00829 AC: 1261 AN: 152128 Hom.: 17 Cov.: 32

Gnomad AFR AF: 0.0287

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00340

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00478

GnomAD2 exomes AF: 0.00219 AC: 550 AN: 250846 AF XY: 0.00156

Gnomad AFR exome AF: 0.0278

Gnomad AMR exome AF: 0.00220

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000168

Gnomad OTH exome AF: 0.000327

GnomAD4 exome AF: 0.000838 AC: 1225 AN: 1461662 Hom.: 17 Cov.: 32 AF XY: 0.000714 AC XY: 519 AN XY: 727126

African (AFR) AF: 0.0257 AC: 860 AN: 33464

American (AMR) AF: 0.00237 AC: 106 AN: 44688

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.0000927 AC: 8 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53390

Middle Eastern (MID) AF: 0.000520 AC: 3 AN: 5768

European-Non Finnish (NFE) AF: 0.000115 AC: 128 AN: 1111894

Other (OTH) AF: 0.00199 AC: 120 AN: 60382

GnomAD4 genome AF: 0.00829 AC: 1262 AN: 152246 Hom.: 17 Cov.: 32 AF XY: 0.00881 AC XY: 656 AN XY: 74424

African (AFR) AF: 0.0286 AC: 1188 AN: 41528

American (AMR) AF: 0.00340 AC: 52 AN: 15292

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10608

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 68016

Other (OTH) AF: 0.00473 AC: 10 AN: 2114

Alfa AF: 0.000475 Hom.: 0

Bravo AF: 0.00929

EpiCase AF: 0.000218

EpiControl AF: 0.000178

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	2	Leber congenital amaurosis 2;C3151086:Retinitis pigmentosa 20 (2)
-	-	2	not provided (3)
-	-	1	Leber congenital amaurosis 2 (1)
-	-	1	not specified (1)
-	-	1	Retinitis pigmentosa (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
CADD	Benign	0.019
DANN	Benign	0.41
PhyloP100		-5.4
Mutation Taster		=99/1	polymorphism

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

Other links and lift over

dbSNP: rs62636301; hg19: chr1-68897001;