chr22-41527949-C-T

Position:

chr22-41527949-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2PP2PP3PP5

The NM_001098.3(ACO2):c.2135C>T(p.Pro712Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000403 in 1,614,072 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000031 ( 0 hom. )

Consequence

ACO2
NM_001098.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:5U:1

Conservation

PhyloP100: 7.18

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:

POLR3H (HGNC:30349): (RNA polymerase III subunit H) Enables DNA-directed 5'-3' RNA polymerase activity. Involved in transcription by RNA polymerase III. Located in centrosome and nucleoplasm. Part of RNA polymerase III complex. [provided by Alliance of Genome Resources, Apr 2022]

POLR3H links:

ACO2 (HGNC:):

ACO2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ACO2. . Gene score misZ 2.9201 (greater than the threshold 3.09). Trascript score misZ 4.3251 (greater than threshold 3.09). GenCC has associacion of gene with infantile cerebellar-retinal degeneration, autosomal recessive optic atrophy, optic atrophy 9.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.78

PP5

Variant 22-41527949-C-T is Pathogenic according to our data. Variant chr22-41527949-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 218317.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1, Likely_pathogenic=3}. Variant chr22-41527949-C-T is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ACO2	NM_001098.3 linkuse as main transcript	c.2135C>T	p.Pro712Leu	missense_variant	17/18	ENST00000216254.9	NP_001089.1	Q99798
POLR3H	NM_001018050.4 linkuse as main transcript	c.*1334G>A		3_prime_UTR_variant	6/6	ENST00000355209.9	NP_001018060.1	Q9Y535-1A0A024R1P3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ACO2	ENST00000216254.9 linkuse as main transcript	c.2135C>T	p.Pro712Leu	missense_variant	17/18	1	NM_001098.3	ENSP00000216254.4		Q99798
POLR3H	ENST00000355209.9 linkuse as main transcript	c.*1334G>A		3_prime_UTR_variant	6/6	1	NM_001018050.4	ENSP00000347345.4		Q9Y535-1

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000458

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000359

AC:

AN:

250696

Hom.:

AF XY:

0.0000517

AC XY:

AN XY:

135520

show subpopulations

Gnomad AFR exome

AF:

0.000431

Gnomad AMR exome

AF:

0.0000289

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:

0.00000885

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000315

AC:

AN:

1461884

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00111

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.000125

AC:

AN:

152188

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74350

show subpopulations

Gnomad4 AFR

AF:

0.000458

Gnomad4 AMR

AF:

0.00

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:

0.0000322

Hom.:

Bravo

AF:

0.000121

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000330

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:5Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Infantile cerebellar-retinal degeneration

Pathogenic:3

Likely pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 28, 2019	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Oct 19, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Nov 14, 2013	Likely pathogenicity based on finding it once in trans with another missense variant (R607C) in a 2-year-old male with global delays, bilateral sensorineural hearing loss, hypotonia, ataxia, myclonic jerks, dysmorphisms, small arachnoid cyst. -

not provided

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 23, 2021	Published functional studies demonstrate a damaging effect on ACO2 enzyme activity (Sadat et al., 2016); In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect; This variant is associated with the following publications: (PMID: 32519519, 26992325, 31106992, 29564393, 32713659, 33028849, 31589614) -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 15, 2023	This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 712 of the ACO2 protein (p.Pro712Leu). This variant is present in population databases (rs375761361, gnomAD 0.04%). This missense change has been observed in individuals with clinical features of infantile cerebellar-retinal degeneration (PMID: 26992325, 29564393). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 218317). 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 with a negative predictive value of 80%. For these reasons, this variant has been classified as Pathogenic. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 01, 2024

Variant summary: ACO2 c.2135C>T (p.Pro712Leu) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 3.6e-05 in 250696 control chromosomes. c.2135C>T has been reported in the literature in multiple compound heterozygous individuals affected with infantile cerebellar-retinal degeneration or optic atrophy with spastic paraplegia (e.g. Sadat_2016, Marelli_2018). These data indicate that the variant may be associated with disease. Two publications report experimental evidence evaluating an impact on protein function, showing reduced enzyme activity in patient fibroblasts from compound heterozygous individuals, however, none of these studies allows convincing conclusions about the variant effect (e.g. Sadat_2016, Marelli_2018). The following publications have been ascertained in the context of this evaluation (PMID: 29564393, 26992325). ClinVar contains an entry for this variant (Variation ID: 218317). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.26

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.77

D;.

Eigen

Uncertain

0.64

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Pathogenic

0.99

D;D

M_CAP

Uncertain

0.18

MetaRNN

Pathogenic

0.78

D;D

MetaSVM

Benign

-0.30

MutationAssessor

Pathogenic

3.6

H;.

PrimateAI

Pathogenic

0.83

PROVEAN

Pathogenic

-8.7

D;D

REVEL

Uncertain

0.32

Sift

Uncertain

0.0020

D;D

Sift4G

Uncertain

0.031

D;D

Polyphen

0.97

D;P

Vest4

0.93

MVP

0.76

MPC

1.6

ClinPred

0.98

GERP RS

3.9

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.8

Varity_R

0.84

gMVP

0.85

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

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