NM_002488.5:c.155C>A

Variant names:

• chr5-140647309-G-T
• NM_002488.5:c.155C>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_002488.5(NDUFA2):​c.155C>A​(p.Pro52His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000695 in 1,438,984 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: NDUFA2 NM_002488.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.79
• Publications: 0 publications found

Genes affected

NDUFA2 (HGNC:7685): (NADH:ubiquinone oxidoreductase subunit A2) The encoded protein is a subunit of the hydrophobic protein fraction of the NADH:ubiquinone oxidoreductase (complex 1), the first enzyme complex in the electron transport chain located in the inner mitochondrial membrane, and may be involved in regulating complex I activity or its assembly via assistance in redox processes. Mutations in this gene are associated with Leigh syndrome, an early-onset progressive neurodegenerative disorder. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

IK (HGNC:5958): (IK cytokine) The protein encoded by this gene was identified by its RED repeat, a stretch of repeated arginine, glutamic acid and aspartic acid residues. The protein localizes to discrete dots within the nucleus, excluding the nucleolus. Its function is unknown. This gene maps to chromosome 5; however, a pseudogene may exist on chromosome 2. [provided by RefSeq, Jul 2008]

TMCO6 (HGNC:28814): (transmembrane and coiled-coil domains 6) Predicted to enable nuclear import signal receptor activity. Predicted to be involved in protein import into nucleus. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_002488.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 2 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: -0.24046 (below the threshold of 3.09). Trascript score misZ: -0.5731 (below the threshold of 3.09). GenCC associations: The gene is linked to mitochondrial complex I deficiency, nuclear type 13, Leigh syndrome, cystic leukoencephalopathy without megalencephaly, Leigh syndrome with leukodystrophy.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002488.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDUFA2	NM_002488.5	MANE Select	c.155C>A	p.Pro52His	missense	Exon 2 of 3	NP_002479.1	O43678-1
	NDUFA2	NM_001185012.2		c.155C>A	p.Pro52His	missense	Exon 2 of 3	NP_001171941.1	O43678-2
	NDUFA2	NR_033697.2		n.322C>A		non_coding_transcript_exon	Exon 1 of 2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDUFA2	ENST00000252102.9	TSL:1 MANE Select	c.155C>A	p.Pro52His	missense	Exon 2 of 3	ENSP00000252102.5	O43678-1
	NDUFA2	ENST00000512088.1	TSL:2	c.155C>A	p.Pro52His	missense	Exon 2 of 3	ENSP00000427220.1	O43678-2
	IK	ENST00000513256.5	TSL:4	c.4G>T	p.Gly2Cys	missense splice_region	Exon 1 of 5	ENSP00000425564.1	D6RCQ4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.95e-7 AC: 1 AN: 1438984 Hom.: 0 Cov.: 30 AF XY: 0.00000140 AC XY: 1 AN XY: 712680

African (AFR) AF: 0.00 AC: 0 AN: 33004

American (AMR) AF: 0.00 AC: 0 AN: 43216

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24526

East Asian (EAS) AF: 0.00 AC: 0 AN: 39432

South Asian (SAS) AF: 0.00 AC: 0 AN: 83054

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52396

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5654

European-Non Finnish (NFE) AF: 9.10e-7 AC: 1 AN: 1098384

Other (OTH) AF: 0.00 AC: 0 AN: 59318

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Uncertain	0.054	T
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	33
DANN	Uncertain	1.0
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.27	T
M_CAP	Uncertain	0.099	D
MetaRNN	Uncertain	0.46	T
MetaSVM	Uncertain	-0.014	T
PhyloP100		8.8
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.20
Sift	Uncertain	0.027	D
Sift4G	Uncertain	0.020	D
MutPred		0.29		Gain of catalytic residue at G2 (P = 0.0195)
MVP		0.70
ClinPred		1.0	D
GERP RS		5.2
PromoterAI		-0.0080	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
Mutation Taster		=6/94	disease causing

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

Other links and lift over

hg19: chr5-140026894;