9-32418178-A-G

Variant names:

• chr9-32418178-A-G
• NM_002197.3:c.455A>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002197.3(ACO1):​c.455A>G​(p.Glu152Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: ACO1 NM_002197.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.32
• Publications: 0 publications found

Genes affected

ACO1 (HGNC:117): (aconitase 1) The protein encoded by this gene is a bifunctional, cytosolic protein that functions as an essential enzyme in the TCA cycle and interacts with mRNA to control the levels of iron inside cells. When cellular iron levels are high, this protein binds to a 4Fe-4S cluster and functions as an aconitase. Aconitases are iron-sulfur proteins that function to catalyze the conversion of citrate to isocitrate. When cellular iron levels are low, the protein binds to iron-responsive elements (IREs), which are stem-loop structures found in the 5' UTR of ferritin mRNA, and in the 3' UTR of transferrin receptor mRNA. When the protein binds to IRE, it results in repression of translation of ferritin mRNA, and inhibition of degradation of the otherwise rapidly degraded transferrin receptor mRNA. The encoded protein has been identified as a moonlighting protein based on its ability to perform mechanistically distinct functions. Alternative splicing results in multiple transcript variants [provided by RefSeq, Jan 2014]

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.92

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACO1	NM_002197.3	c.455A>G	p.Glu152Gly	missense_variant	Exon 5 of 21	ENST00000309951.8	NP_002188.1
ACO1	NM_001278352.2	c.455A>G	p.Glu152Gly	missense_variant	Exon 6 of 22		NP_001265281.1
ACO1	NM_001362840.2	c.455A>G	p.Glu152Gly	missense_variant	Exon 6 of 22		NP_001349769.1
ACO1	XM_047423430.1	c.479A>G	p.Glu160Gly	missense_variant	Exon 5 of 21		XP_047279386.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACO1	ENST00000309951.8	c.455A>G	p.Glu152Gly	missense_variant	Exon 5 of 21	1	NM_002197.3	ENSP00000309477.5
ACO1	ENST00000379923.5	c.455A>G	p.Glu152Gly	missense_variant	Exon 6 of 22	5		ENSP00000369255.1
ACO1	ENST00000541043.5	c.455A>G	p.Glu152Gly	missense_variant	Exon 6 of 22	5		ENSP00000438733.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 26, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.455A>G (p.E152G) alteration is located in exon 5 (coding exon 4) of the ACO1 gene. This alteration results from a A to G substitution at nucleotide position 455, causing the glutamic acid (E) at amino acid position 152 to be replaced by a glycine (G). 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	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	31
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.82	D;D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	1.0	D;.;.
M_CAP	Uncertain	0.099	D
MetaRNN	Pathogenic	0.92	D;D;D
MetaSVM	Uncertain	-0.17	T
MutationAssessor	Pathogenic	4.5	H;H;H
PhyloP100		9.3
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-6.8	.;D;D
REVEL	Pathogenic	0.68
Sift	Uncertain	0.0010	.;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0	D;D;D
Vest4		0.92
MutPred		0.71		Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);Loss of helix (P = 0.0093);
MVP		0.65
MPC		0.92
ClinPred		1.0	D
GERP RS		6.1
Varity_R		0.95
gMVP		0.89
Mutation Taster		=17/83	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Other links and lift over

hg19: chr9-32418176;