rs387906899

Variant names:

• chr3-193643609-A-G
• rs387906899
• NM_130837.3:c.1459A>G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Moderate PP5_Moderate

The NM_130837.3(OPA1):​c.1459A>G​(p.Ile487Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,746 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: OPA1 NM_130837.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:3
• Conservation: PhyloP100: 9.26

Genes affected

OPA1 (HGNC:8140): (OPA1 mitochondrial dynamin like GTPase) The protein encoded by this gene is a nuclear-encoded mitochondrial protein with similarity to dynamin-related GTPases. The encoded protein localizes to the inner mitochondrial membrane and helps regulate mitochondrial stability and energy output. This protein also sequesters cytochrome c. Mutations in this gene have been associated with optic atrophy type 1, which is a dominantly inherited optic neuropathy resulting in progressive loss of visual acuity, leading in many cases to legal blindness. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a hotspot region, there are 6 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 6 uncertain in NM_130837.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.931
• PP5: Variant 3-193643609-A-G is Pathogenic according to our data. Variant chr3-193643609-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 30460.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OPA1	NM_130837.3	c.1459A>G	p.Ile487Val	missense_variant	Exon 15 of 31	ENST00000361510.8	NP_570850.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OPA1	ENST00000361510.8	c.1459A>G	p.Ile487Val	missense_variant	Exon 15 of 31	5	NM_130837.3	ENSP00000355324.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460746 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726758

Gnomad4 AFR exome AF: 0.0000299

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, single submitter

Submissions by phenotype

Mitochondrial disease Pathogenic:1

Apr 07, 2017

Wellcome Centre for Mitochondrial Research, Newcastle University

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Optic atrophy with or without deafness, ophthalmoplegia, myopathy, ataxia, and neuropathy Pathogenic:1

Nov 25, 2008

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Autosomal dominant optic atrophy classic form Pathogenic:1

Jun 24, 2022

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Likely pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with OPA1-related disease (OMIM). (I) 0108 - This gene is associated with both recessive and dominant disease. Truncating variants and mutations in the C-terminal domain are associated with dominant optic atrophy. Individuals carrying missense variants clustered within the GTPase domain generally develop an optic atrophy syndrome. Lastly, biallelic variants have been associated with early onset Behr syndrome (PMID: 31500643, 28494813, 25012220, 30165240). (I) 0112 - The condition associated with this gene has incomplete penetrance (PMID: 17306754). (I) 0200 - Variant is predicted to result in a missense amino acid change from isoleucine to valine. (I) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. (I) 0600 - Variant is located in the annotated GPTase domain (PMID: 20157015). (I) 0704 - An inframe deletion variant comparable to the missense variant identified in this case has limited previous evidence for pathogenicity. This variant, p.(Ile487del), has been reported in a single individual with dominant optic atrophy (PMID: 11440988). (SP) 0803 - This variant has limited previous evidence of pathogenicity in an unrelated individual. This variant has been observed in an unrelated family with mitochondrial disease, chronic progressive external ophthalmoplegia (CPEO) and/or syndromic optic atrophy (PMID: 19029523; 20157015; 24086434). (SP) 0906 - Segregation evidence for this variant is inconclusive. This variant segregated with disease in a single family, however more meioses are required for pathogenicity to be established (PMID: 19029523; 20157015). (I) 1010 - Functional evidence for this variant is inconclusive. Functional analysis of patient fibroblasts did not demonstrate an effect on mitochondrial morphology when compared to controls (PMID: 34014035). (I) 1102 - Strong phenotype match for this individual. (SP) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Pathogenic	0.47	D
BayesDel_noAF	Pathogenic	0.44
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.42	T;.;.;D;D;.;.;.;.;.;.
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D;D;D;.;D;D;D;D;D;D
M_CAP	Pathogenic	0.51	D
MetaRNN	Pathogenic	0.93	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.6	.;.;.;M;M;.;.;.;.;.;.
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-0.96	N;N;N;.;N;N;.;.;.;.;.
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D;D;D;.;D;D;.;.;.;.;.
Sift4G	Pathogenic	0.0	D;D;D;.;D;D;.;.;.;.;.
Polyphen		0.99	D;.;.;D;D;.;.;.;.;.;.
Vest4		0.67
MutPred		0.80		.;.;Gain of catalytic residue at I487 (P = 0.1016);.;.;.;.;.;.;.;.;
MVP		0.92
MPC		1.4
ClinPred		0.99	D
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.53
gMVP		0.54

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

Other links and lift over

dbSNP: rs387906899; hg19: chr3-193361398;