chr20-25012924-C-T

Position:

• chr20-25012924-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_032501.4(ACSS1):​c.1595G>A​(p.Gly532Glu) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: ACSS1 NM_032501.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.25

Genes affected

ACSS1 (HGNC:16091): (acyl-CoA synthetase short chain family member 1) This gene encodes a mitochondrial acetyl-CoA synthetase enzyme. A similar protein in mice plays an important role in the tricarboxylic acid cycle by catalyzing the conversion of acetate to acetyl CoA. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2011]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.99

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACSS1	NM_032501.4	c.1595G>A	p.Gly532Glu	missense_variant	11/14	ENST00000323482.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACSS1	ENST00000323482.9	c.1595G>A	p.Gly532Glu	missense_variant	11/14	1	NM_032501.4	P1
ACSS1	ENST00000432802.6	c.1595G>A	p.Gly532Glu	missense_variant	11/12	2
ACSS1	ENST00000537502.5	c.1232G>A	p.Gly411Glu	missense_variant	10/13	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 17, 2023

The c.1595G>A (p.G532E) alteration is located in exon 11 (coding exon 11) of the ACSS1 gene. This alteration results from a G to A substitution at nucleotide position 1595, causing the glycine (G) at amino acid position 532 to be replaced by a glutamic acid (E). 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	0.94
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.40
CADD	Pathogenic	29
DANN	Uncertain	1.0
Eigen	Pathogenic	0.86
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	1.0	D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.88	D
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.73	T
REVEL	Pathogenic	0.90
Sift4G	Uncertain	0.0050	D;D;D
Polyphen		0.98	.;.;D
Vest4		0.97
MutPred		0.96		.;Loss of methylation at R537 (P = 0.0941);Loss of methylation at R537 (P = 0.0941);
MVP		0.97
MPC		1.7
ClinPred		0.99	D
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		0.91

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

Other links and lift over

dbSNP: rs2088438559; hg19: chr20-24993560;