chr19-45529184-G-A

Variant names:

• chr19-45529184-G-A
• rs762180740
• ENST00000323060.4:c.415C>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PVS1_Strong BS1_Supporting

The NM_001017989.3(OPA3):​c.415C>T​(p.Gln139*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000377 in 1,458,268 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000038 (1 hom.)
• Consequence: OPA3 NM_001017989.3 stop_gained
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.94

Genes affected

OPA3 (HGNC:8142): (outer mitochondrial membrane lipid metabolism regulator OPA3) The mouse ortholog of this protein co-purifies with the mitochondrial inner membrane. Mutations in this gene have been shown to result in 3-methylglutaconic aciduria type III and autosomal dominant optic atrophy and cataract. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.236 CDS is truncated, and there are 1 pathogenic variants in the truncated region.
• BS1: Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.0000377 (55/1458268) while in subpopulation SAS AF= 0.000626 (54/86222). AF 95% confidence interval is 0.000492. There are 1 homozygotes in gnomad4_exome. There are 43 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OPA3	NM_001017989.3	c.415C>T	p.Gln139*	stop_gained	Exon 2 of 2		NP_001017989.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OPA3	ENST00000323060.4	c.415C>T	p.Gln139*	stop_gained	Exon 2 of 2	1		ENSP00000319817.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.0000957 AC: 23 AN: 240216 Hom.: 1 AF XY: 0.000137 AC XY: 18 AN XY: 131506

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: 0.000756

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000377 AC: 55 AN: 1458268 Hom.: 1 Cov.: 31 AF XY: 0.0000593 AC XY: 43 AN XY: 725646

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: 0.000626

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 31

Alfa AF: 0.000179 Hom.: 0

Bravo AF: 0.00000756

ExAC AF: 0.0000745 AC: 9

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

3-Methylglutaconic aciduria type 3 Uncertain:1

Aug 11, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Pathogenic	0.47
CADD	Pathogenic	36
DANN	Uncertain	0.99
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Pathogenic	0.97	D
Vest4		0.42
GERP RS		1.2

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs762180740; hg19: chr19-46032442;