15-78168961-G-C

Variant names:

• chr15-78168961-G-C
• NM_005530.3:c.1057G>C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005530.3(IDH3A):​c.1057G>C​(p.Asp353His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000689 in 1,452,396 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: IDH3A NM_005530.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.18

Genes affected

IDH3A (HGNC:5384): (isocitrate dehydrogenase (NAD(+)) 3 catalytic subunit alpha) Isocitrate dehydrogenases catalyze the oxidative decarboxylation of isocitrate to 2-oxoglutarate. These enzymes belong to two distinct subclasses, one of which utilizes NAD(+) as the electron acceptor and the other NADP(+). Five isocitrate dehydrogenases have been reported: three NAD(+)-dependent isocitrate dehydrogenases, which localize to the mitochondrial matrix, and two NADP(+)-dependent isocitrate dehydrogenases, one of which is mitochondrial and the other predominantly cytosolic. NAD(+)-dependent isocitrate dehydrogenases catalyze the allosterically regulated rate-limiting step of the tricarboxylic acid cycle. Each isozyme is a heterotetramer that is composed of two alpha subunits, one beta subunit, and one gamma subunit. The protein encoded by this gene is the alpha subunit of one isozyme of NAD(+)-dependent isocitrate dehydrogenase. [provided by RefSeq, Jul 2008]

ACSBG1 (HGNC:29567): (acyl-CoA synthetase bubblegum family member 1) The protein encoded by this gene possesses long-chain acyl-CoA synthetase activity. It is thought to play a central role in brain very long-chain fatty acids metabolism and myelinogenesis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37418628).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IDH3A	NM_005530.3	c.1057G>C	p.Asp353His	missense_variant	Exon 11 of 11	ENST00000299518.7	NP_005521.1
ACSBG1	NM_015162.5	c.*2483C>G		3_prime_UTR_variant	Exon 14 of 14	ENST00000258873.9	NP_055977.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IDH3A	ENST00000299518.7	c.1057G>C	p.Asp353His	missense_variant	Exon 11 of 11	1	NM_005530.3	ENSP00000299518.2
ACSBG1	ENST00000258873	c.*2483C>G		3_prime_UTR_variant	Exon 14 of 14	1	NM_015162.5	ENSP00000258873.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.89e-7 AC: 1 AN: 1452396 Hom.: 0 Cov.: 28 AF XY: 0.00000139 AC XY: 1 AN XY: 721360

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000253

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Feb 22, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1057G>C (p.D353H) alteration is located in exon 11 (coding exon 11) of the IDH3A gene. This alteration results from a G to C substitution at nucleotide position 1057, causing the aspartic acid (D) at amino acid position 353 to be replaced by a histidine (H). 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	0.24
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;D;D
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.94	D;D;D
M_CAP	Benign	0.027	D
MetaRNN	Benign	0.37	T;T;T
MetaSVM	Benign	-0.66	T
MutationAssessor	Uncertain	2.4	M;.;.
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-2.4	N;N;N
REVEL	Benign	0.25
Sift	Benign	0.037	D;D;D
Sift4G	Uncertain	0.035	D;D;D
Polyphen		0.0010	B;.;.
Vest4		0.21
MutPred		0.61		Loss of ubiquitination at K350 (P = 0.0508);.;.;
MVP		0.83
MPC		1.7
ClinPred		0.97	D
GERP RS		6.2
Varity_R		0.34
gMVP		0.79

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr15-78461303;