rs764138297

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PM5PP2PP3

The NM_001098.3(ACO2):c.718G>A(p.Gly240Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000198 in 1,613,956 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G240A) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

ACO2
NM_001098.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 9.31

Variant links:

Genes affected

ACO2 (HGNC:118): (aconitase 2) The protein encoded by this gene belongs to the aconitase/IPM isomerase family. It is an enzyme that catalyzes the interconversion of citrate to isocitrate via cis-aconitate in the second step of the TCA cycle. This protein is encoded in the nucleus and functions in the mitochondrion. It was found to be one of the mitochondrial matrix proteins that are preferentially degraded by the serine protease 15(PRSS15), also known as Lon protease, after oxidative modification. [provided by RefSeq, Jul 2008]

ACO2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr22-41515801-G-C is described in Lovd as [Likely_pathogenic].

PP2

Missense variant in the ACO2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 14 curated pathogenic missense variants (we use a threshold of 10). The gene has 37 curated benign missense variants. Gene score misZ: 2.9201 (below the threshold of 3.09). Trascript score misZ: 4.3251 (above the threshold of 3.09). GenCC associations: The gene is linked to infantile cerebellar-retinal degeneration, autosomal recessive optic atrophy, optic atrophy 9.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.809

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACO2	NM_001098.3 link	c.718G>A	p.Gly240Ser	missense_variant	Exon 6 of 18	ENST00000216254.9	NP_001089.1	Q99798

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACO2	ENST00000216254.9 link	c.718G>A	p.Gly240Ser	missense_variant	Exon 6 of 18	1	NM_001098.3	ENSP00000216254.4		Q99798

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000327

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000676

AC:

AN:

251468

Hom.:

AF XY:

0.0000809

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000318

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:

0.0000264

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000178

AC:

AN:

1461750

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

727180

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.000268

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:

0.00000629

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000327

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000508

Hom.:

Bravo

AF:

0.0000453

ExAC

AF:

0.0000576

AC:

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Feb 02, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 14, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported as heterozygous in an individual diagnosed at age 32 years with acute vision loss and was also heterozygous in the asymptomatic mother; the patient had head trauma as a child, followed by epilepsy, meningeal syndrome, and diabetes insipidus (PMID: 34056600); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 34056600) -

Jul 17, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is present in population databases (rs764138297, gnomAD 0.03%). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt ACO2 protein function. ClinVar contains an entry for this variant (Variation ID: 235453). This missense change has been observed in individual(s) with optic atrophy (PMID: 34056600). This sequence change replaces glycine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 240 of the ACO2 protein (p.Gly240Ser). -

Inborn genetic diseases

Uncertain:1

Jul 15, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.718G>A (p.G240S) alteration is located in exon 6 (coding exon 6) of the ACO2 gene. This alteration results from a G to A substitution at nucleotide position 718, causing the glycine (G) at amino acid position 240 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Uncertain

0.013

BayesDel_noAF

Uncertain

0.090

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.60

D;.

Eigen

Pathogenic

0.85

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.89

D;D

M_CAP

Uncertain

0.23

MetaRNN

Pathogenic

0.81

D;D

MetaSVM

Uncertain

0.54

MutationAssessor

Pathogenic

3.1

M;.

PrimateAI

Uncertain

0.73

PROVEAN

Pathogenic

-5.3

D;D

REVEL

Pathogenic

0.67

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.039

D;D

Polyphen

0.99

D;D

Vest4

0.70

MVP

0.93

MPC

1.6

ClinPred

0.76

GERP RS

5.8

Varity_R

0.90

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.16

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over