3-193642975-C-CTT

Variant names:

• chr3-193642975-C-CTT
• rs863225275
• NM_130837.3:c.1232_1233dupTT

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_130837.3(OPA1):​c.1232_1233dupTT​(p.Ala412LeufsTer4) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as not provided (no stars). Synonymous variant affecting the same amino acid position (i.e. A412A) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: OPA1 NM_130837.3 frameshift
• Clinical Significance: not provided no classification provided O:1
• Conservation: PhyloP100: 7.70
• Publications: 3 publications found

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]

OPA1 Gene-Disease associations (from GenCC):

• autosomal dominant optic atrophy, classic form

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics
• optic atrophy

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• optic atrophy with or without deafness, ophthalmoplegia, myopathy, ataxia, and neuropathy

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), G2P
• OPA1-related optic atrophy with or without extraocular features

  Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
• Behr syndrome

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• mitochondrial DNA depletion syndrome 14 (cardioencephalomyopathic type)

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• autosomal dominant optic atrophy plus syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_130837.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OPA1	NM_130837.3	MANE Select	c.1232_1233dupTT	p.Ala412LeufsTer4	frameshift	Exon 13 of 31	NP_570850.2
	OPA1	NM_130836.3		c.1178_1179dupTT	p.Ala394LeufsTer4	frameshift	Exon 12 of 30	NP_570849.2
	OPA1	NM_130835.3		c.1124_1125dupTT	p.Ala376LeufsTer4	frameshift	Exon 12 of 30	NP_570848.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OPA1	ENST00000361510.8	TSL:5 MANE Select	c.1232_1233dupTT	p.Ala412LeufsTer4	frameshift	Exon 13 of 31	ENSP00000355324.2
	OPA1	ENST00000361908.8	TSL:1	c.1178_1179dupTT	p.Ala394LeufsTer4	frameshift	Exon 12 of 30	ENSP00000354681.3
	OPA1	ENST00000361715.6	TSL:5	c.1124_1125dupTT	p.Ala376LeufsTer4	frameshift	Exon 12 of 30	ENSP00000355311.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: not provided

Submissions summary: Other:1

Revision: no classification provided

Submissions by phenotype

Autosomal dominant optic atrophy classic form Other:1

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.7
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs863225275; hg19: chr3-193360764;