NM_005005.3:c.1A>G

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_SupportingPM2PP5

The NM_005005.3(NDUFB9):c.1A>G(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.000155 in 1,614,104 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: 𝑓 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

NDUFB9
NM_005005.3 start_lost

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2

Conservation

PhyloP100: 5.23

Variant links:

Genes affected

NDUFB9 (HGNC:7704): (NADH:ubiquinone oxidoreductase subunit B9) The protein encoded by this gene is a subunit of the mitochondrial oxidative phosphorylation complex I (nicotinamide adenine dinucleotide: ubiquinone oxidoreductase). Complex I is localized to the inner mitochondrial membrane and functions to dehydrogenate nicotinamide adenine dinucleotide and to shuttle electrons to coenzyme Q. Complex I deficiency is the most common defect found in oxidative phosphorylation disorders and results in a range of conditions, including lethal neonatal disease, hypertrophic cardiomyopathy, liver disease, and adult-onset neurodegenerative disorders. Pseudogenes of this gene are found on chromosomes five, seven and eight. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2015]

NDUFB9 links:

TATDN1 (HGNC:24220): (TatD DNase domain containing 1) Predicted to enable 3'-5'-exodeoxyribonuclease activity. Predicted to be involved in DNA metabolic process and nucleic acid phosphodiester bond hydrolysis. Located in nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

TATDN1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PVS1

Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 44 codons. Genomic position: 124543115. Lost 0.241 part of the original CDS.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 8-124539187-A-G is Pathogenic according to our data. Variant chr8-124539187-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 379528.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NDUFB9	NM_005005.3 link	c.1A>G	p.Met1?	start_lost	Exon 1 of 4	ENST00000276689.8	NP_004996.1	Q9Y6M9
TATDN1	NM_032026.4 link	c.-141T>C		upstream_gene_variant		ENST00000276692.11	NP_114415.1	Q6P1N9-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NDUFB9	ENST00000276689.8 link	c.1A>G	p.Met1?	start_lost	Exon 1 of 4	1	NM_005005.3	ENSP00000276689.3		Q9Y6M9
TATDN1	ENST00000276692.11 link	c.-141T>C		upstream_gene_variant		1	NM_032026.4	ENSP00000276692.6		Q6P1N9-1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152250

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000135

AC:

AN:

251262

Hom.:

AF XY:

0.000191

AC XY:

AN XY:

135886

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000291

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000166

AC:

243

AN:

1461854

Hom.:

Cov.:

AF XY:

0.000177

AC XY:

129

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000374

Gnomad4 NFE exome

AF:

0.000211

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152250

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74388

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000103

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000229

Hom.:

Bravo

AF:

0.0000869

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000123

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Uncertain:1

Apr 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change affects the initiator methionine of the NDUFB9 mRNA. The next in-frame methionine is located at codon 44. This variant is present in population databases (rs369824948, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with NDUFB9-related conditions. ClinVar contains an entry for this variant (Variation ID: 379528). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. -

Apr 22, 2015

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1 A>G variant in the NDUFB9 gene has not been reported as a pathogenic variant. The substitution alters the initiator Methionine codon, and the resultant protein would be described as p.Met1?" using a question mark to signify that it is not known if the loss of Met1 means that all protein translation is completely prevented or if an abnormal protein is produced using an alternate Met. We interpret c.1 A>G to be a pathogenic variant." -

not specified

Uncertain:1

Feb 09, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: NDUFB9 c.1A>G (p.Met1Val) alters the initiation codon and is predicted to result either in absence of the protein or truncation of the encoded protein due to translation initiation at a downstream codon. An alternative downstream in-frame start codon (Met44) is located in exon 2 of the encoded protein. An activation of potential downstream translation at this initiation site would result in a shortened protein missing the first 43 amino acids from the protein sequence. To our knowledge no pathogenic variants have been reported upstream of this alternate codon. Three of four in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00014 in 251262 control chromosomes, predominantly at a frequency of 0.00029 within the Non-Finnish European subpopulation in the gnomAD database. This frequency does not allow for any conclusions about variant significance. To our knowledge, no occurrence of c.1A>G in individuals affected with Mitochondrial Complex 1 Deficiency, Nuclear Type 24 and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 379528). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.37

CADD

Benign

DANN

Benign

0.97

DEOGEN2

Benign

0.13

.;T;.;T

Eigen

Uncertain

0.37

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.90

D;D;D;D

M_CAP

Pathogenic

0.87

MetaRNN

Pathogenic

0.85

D;D;D;D

MetaSVM

Uncertain

0.55

PROVEAN

Benign

-1.7

.;N;N;N

REVEL

Uncertain

0.64

Sift

Pathogenic

0.0

.;D;D;D

Sift4G

Pathogenic

0.0

.;D;D;D

Polyphen

0.71

.;P;.;.

Vest4

0.90, 0.90, 0.89

MVP

0.94

ClinPred

0.98

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.97

gMVP

0.51

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

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