chr1-161213475-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BS1_Supporting

The NM_001377299.1(NDUFS2):c.1212G>A(p.Lys404Lys) variant causes a splice region, synonymous change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000257 in 1,608,086 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00022 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

NDUFS2
NM_001377299.1 splice_region, synonymous

Scores

Splicing: ADA: 1.000

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 8.90

Variant links:

Genes affected

NDUFS2 (HGNC:7708): (NADH:ubiquinone oxidoreductase core subunit S2) The protein encoded by this gene is a core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (complex I). Mammalian mitochondrial complex I is composed of at least 43 different subunits, 7 of which are encoded by the mitochondrial genome, and the rest are the products of nuclear genes. The iron-sulfur protein fraction of complex I is made up of 7 subunits, including this gene product. Complex I catalyzes the NADH oxidation with concomitant ubiquinone reduction and proton ejection out of the mitochondria. Mutations in this gene are associated with mitochondrial complex I deficiency. Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

NDUFS2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000223 (34/152254) while in subpopulation NFE AF= 0.000412 (28/68024). AF 95% confidence interval is 0.000292. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NDUFS2	NM_001377299.1 link	c.1212G>A	p.Lys404Lys	splice_region_variant, synonymous_variant	Exon 11 of 14	ENST00000676972.1	NP_001364228.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NDUFS2	ENST00000676972.1 link	c.1212G>A	p.Lys404Lys	splice_region_variant, synonymous_variant	Exon 11 of 14		NM_001377299.1	ENSP00000503117.1		O75306-1

Frequencies

GnomAD3 genomes

AF:

0.000223

AC:

AN:

152136

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000412

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000296

AC:

AN:

243626

Hom.:

AF XY:

0.000334

AC XY:

AN XY:

131640

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000590

Gnomad ASJ exome

AF:

0.000616

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000134

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000522

Gnomad OTH exome

AF:

0.000501

GnomAD4 exome

AF:

0.000260

AC:

379

AN:

1455832

Hom.:

Cov.:

AF XY:

0.000254

AC XY:

184

AN XY:

724084

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000677

Gnomad4 ASJ exome

AF:

0.00108

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000210

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000283

Gnomad4 OTH exome

AF:

0.000233

GnomAD4 genome

AF:

0.000223

AC:

AN:

152254

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74426

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00115

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000412

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000484

Hom.:

Bravo

AF:

0.000230

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:3

Dec 10, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported in an individual with drug resistant epilepsy who is also homozygous for a variant in SV2A (PMID: 37985816); In silico analysis indicates that this variant does not alter splicing; This variant is associated with the following publications: (PMID: 37985816) -

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects codon 404 of the NDUFS2 mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the NDUFS2 protein. This variant also falls at the last nucleotide of exon 12, which is part of the consensus splice site for this exon. This variant is present in population databases (rs145959971, gnomAD 0.07%). This variant has not been reported in the literature in individuals affected with NDUFS2-related conditions. ClinVar contains an entry for this variant (Variation ID: 214796). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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. -

Mitochondrial complex 1 deficiency, nuclear type 6

Uncertain:2

Dec 30, 2017

Department Of Genetics, Sultan Qaboos University Hospital, Sultan Qaboos University

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Apr 11, 2023

Genome-Nilou Lab

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mitochondrial complex I deficiency, nuclear type 1

Uncertain:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.16

CADD

Benign

DANN

Benign

0.97

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

2.9

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.98

SpliceAI score (max)

0.090

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over