rs397515462

chr13-47968646-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_003850.3(SUCLA2):c.751G>A(p.Asp251Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,459,474 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SUCLA2 NM_003850.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 7.27

Genes affected

SUCLA2 (HGNC:11448): (succinate-CoA ligase ADP-forming subunit beta) Succinyl-CoA synthetase (SCS) is a mitochondrial matrix enzyme that acts as a heterodimer, being composed of an invariant alpha subunit and a substrate-specific beta subunit. The protein encoded by this gene is an ATP-specific SCS beta subunit that dimerizes with the SCS alpha subunit to form SCS-A, an essential component of the tricarboxylic acid cycle. SCS-A hydrolyzes ATP to convert succinate to succinyl-CoA. Defects in this gene are a cause of myopathic mitochondrial DNA depletion syndrome. A pseudogene of this gene has been found on chromosome 6. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.897
• PP5: Variant 13-47968646-C-T is Pathogenic according to our data. Variant chr13-47968646-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 66034.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SUCLA2	NM_003850.3	c.751G>A	p.Asp251Asn	missense_variant	6/11	ENST00000646932.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SUCLA2	ENST00000646932.1	c.751G>A	p.Asp251Asn	missense_variant	6/11		NM_003850.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459474 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726054

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Mitochondrial DNA depletion syndrome, encephalomyopathic form with methylmalonic aciduria Pathogenic:2 Uncertain:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 01, 2013	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genomic Research Center, Shahid Beheshti University of Medical Sciences	Dec 03, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 10, 2023	This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 251 of the SUCLA2 protein (p.Asp251Asn). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of SUCLA2-related conditions (PMID: 23759946). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 66034). 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 expected to disrupt SUCLA2 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Uncertain	0.041	T
BayesDel_noAF	Benign	-0.18
Cadd	Pathogenic	27
Dann	Pathogenic	1.0
DEOGEN2	Uncertain	0.75	D;D;.;.;.;D;D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Uncertain	0.28	D
MetaRNN	Pathogenic	0.90	D;D;D;D;D;D;D
MetaSVM	Uncertain	0.39	D
MutationAssessor	Pathogenic	3.0	M;M;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.66	T
Polyphen		1.0	D;D;.;.;.;.;.
Vest4		0.98
MutPred		0.78		Gain of catalytic residue at I255 (P = 0.0021);Gain of catalytic residue at I255 (P = 0.0021);Gain of catalytic residue at I255 (P = 0.0021);.;.;.;.;
MVP		0.92
MPC		0.85
ClinPred		1.0	D
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.94
gMVP		0.83

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: rs397515462; hg19: chr13-48542781;