rs754576717

chr3-193637286-G-A

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2 PP3 PP5_Very_Strong

The NM_130837.3(OPA1):c.1035+5G>A variant causes a splice donor 5th base, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: OPA1 NM_130837.3 splice_donor_5th_base, intron
• Scores: Splicing: ADA: 0.9993
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 4.82

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 Pathogenic. Variant got 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 3-193637286-G-A is Pathogenic according to our data. Variant chr3-193637286-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 431939.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr3-193637286-G-A is described in Lovd as [Pathogenic]. Variant chr3-193637286-G-A is described in Lovd as [Likely_pathogenic]. Variant chr3-193637286-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OPA1	NM_130837.3	c.1035+5G>A		splice_donor_5th_base_variant, intron_variant		ENST00000361510.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OPA1	ENST00000361510.8	c.1035+5G>A		splice_donor_5th_base_variant, intron_variant		5	NM_130837.3	A1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 250062 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135078

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.00000884

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 6.99e-7 AC: 1 AN: 1429884 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 713078

Gnomad4 AFR exome AF: 0.00

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: 9.22e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2021	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Athena Diagnostics	Apr 28, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 10, 2016	The c.870+5 G>A variant has been previously reported in association with optic atrophy (Toomes et al., 2001; Baris et al., 2003; Yu-Wai-Man et al., 2010). Siblings harboring the c.870+5 G>A variant presented with optic atrophy, myopathy, neuropathy, and migraines (Yu-Wai-Man et al., 2010). The c.870+5 G>A (denoted c.1035+5 G>A by alternative transcript) has been described in an individual diagnosed with optic atrophy at age 47; the variant segregated with visual problems in the family (Oldak et al., 2014). The 870+5 G>A variant was not observed in approximately 6500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The c.870+5 G>A variant reduces the quality of the splice donor site in intron 8, and is expected to cause abnormal gene splicing. Therefore, this variant is likely pathogenic; however, the possibility that it is benign cannot be excluded. -

Autosomal dominant optic atrophy classic form Pathogenic:2

Likely pathogenic, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	Sep 01, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	3billion	Mar 22, 2022	The variant has been observed in multiple (>3) similarly affected unrelated individuals (PMID: 11440989, 14961560, 20417570, 25137924) and co-segregated with Optic atrophy 1, in multiple affected family members (PMID: 20417570). The variant has been reported at least twice as pathogenic/likely pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000431939). It is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.000004). Therefore, this variant is classified as pathogenic according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
Cadd	Benign	15
Dann	Benign	0.51

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.77
SpliceAI score (max)		0.56		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.56		Position offset: -5

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

Publications

LitVar

Other links and lift over

dbSNP: rs754576717; hg19: chr3-193355075;