NM_002496.4:c.229C>G

Variant names:

• chr11-68033140-C-G
• rs146766138
• NM_002496.4:c.229C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP2 PP3

The NM_002496.4(NDUFS8):​c.229C>G​(p.Arg77Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,548 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R77W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NDUFS8 NM_002496.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.21
• Publications: 6 publications found

Genes affected

NDUFS8 (HGNC:7715): (NADH:ubiquinone oxidoreductase core subunit S8) This gene encodes a subunit of mitochondrial NADH:ubiquinone oxidoreductase, or Complex I, a multimeric enzyme of the respiratory chain responsible for NADH oxidation, ubiquinone reduction, and the ejection of protons from mitochondria. The encoded protein is involved in the binding of two of the six to eight iron-sulfur clusters of Complex I and, as such, is required in the electron transfer process. Mutations in this gene have been associated with Leigh syndrome. [provided by RefSeq, Mar 2010]

MIR7113 (HGNC:49947): (microRNA 7113) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a chain NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial (size 175) in uniprot entity NDUS8_HUMAN there are 18 pathogenic changes around while only 1 benign (95%) in NM_002496.4
• 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 11 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 0.74371 (below the threshold of 3.09). Trascript score misZ: 1.1202 (below the threshold of 3.09). GenCC associations: The gene is linked to Leigh syndrome, Leigh syndrome with leukodystrophy, mitochondrial complex I deficiency, nuclear type 2, mitochondrial complex I deficiency.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.814

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002496.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDUFS8	NM_002496.4	MANE Select	c.229C>G	p.Arg77Gly	missense	Exon 5 of 7	NP_002487.1
	MIR7113	NR_106963.1		n.*218C>G		downstream_gene	N/A

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NDUFS8	ENST00000313468.10	TSL:1 MANE Select	c.229C>G	p.Arg77Gly	missense	Exon 5 of 7	ENSP00000315774.5
	NDUFS8	ENST00000528492.1	TSL:1	c.-67+2407C>G		intron	N/A	ENSP00000432848.1
	NDUFS8	ENST00000526339.5	TSL:2	c.229C>G	p.Arg77Gly	missense	Exon 5 of 7	ENSP00000436287.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460548 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 726608

African (AFR) AF: 0.00 AC: 0 AN: 33464

American (AMR) AF: 0.00 AC: 0 AN: 44658

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26110

East Asian (EAS) AF: 0.00 AC: 0 AN: 39668

South Asian (SAS) AF: 0.00 AC: 0 AN: 86232

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52532

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111772

Other (OTH) AF: 0.00 AC: 0 AN: 60344

GnomAD4 genome Cov.: 33

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.62
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.40
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.50	D
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.38	D
MetaRNN	Pathogenic	0.81	D
MetaSVM	Pathogenic	0.96	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		2.2
PrimateAI	Uncertain	0.79	T
PROVEAN	Uncertain	-3.6	D
REVEL	Pathogenic	0.79
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.035	D
Polyphen		0.45	B
Vest4		0.96
MutPred		0.56		Loss of catalytic residue at R77 (P = 0.0993)
MVP		0.97
MPC		0.78
ClinPred		0.94	D
GERP RS		4.7
Varity_R		0.77
gMVP		0.81
Mutation Taster		=19/81	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

dbSNP: rs146766138; hg19: chr11-67800607;