16-69711001-T-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000903.3(NQO1):c.800A>T(p.Asp267Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D267N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NQO1 NM_000903.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.54

Genes affected

NQO1 (HGNC:2874): (NAD(P)H quinone dehydrogenase 1) This gene is a member of the NAD(P)H dehydrogenase (quinone) family and encodes a cytoplasmic 2-electron reductase. This FAD-binding protein forms homodimers and reduces quinones to hydroquinones. This protein's enzymatic activity prevents the one electron reduction of quinones that results in the production of radical species. Mutations in this gene have been associated with tardive dyskinesia (TD), an increased risk of hematotoxicity after exposure to benzene, and susceptibility to various forms of cancer. Altered expression of this protein has been seen in many tumors and is also associated with Alzheimer's disease (AD). Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34037963).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NQO1	NM_000903.3	c.800A>T	p.Asp267Val	missense_variant	6/6	ENST00000320623.10
NQO1	NM_001025433.2	c.698A>T	p.Asp233Val	missense_variant	5/5
NQO1	NM_001025434.2	c.686A>T	p.Asp229Val	missense_variant	5/5
NQO1	NM_001286137.2	c.584A>T	p.Asp195Val	missense_variant	4/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NQO1	ENST00000320623.10	c.800A>T	p.Asp267Val	missense_variant	6/6	1	NM_000903.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 30, 2022

The p.D267V variant (also known as c.800A>T), located in coding exon 6 of the NQO1 gene, results from an A to T substitution at nucleotide position 800. The aspartic acid at codon 267 is replaced by valine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.0038	T
BayesDel_noAF	Benign	-0.24
Cadd	Uncertain	25
Dann	Uncertain	0.99
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.93	D;D;D;D;D
M_CAP	Benign	0.021	T
MetaRNN	Benign	0.34	T;T;T;T;T
MetaSVM	Benign	-1.2	T
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Benign	0.39	T
PROVEAN	Uncertain	-3.0	D;N;D;D;N
REVEL	Benign	0.21
Sift	Uncertain	0.0010	D;D;D;D;D
Sift4G	Uncertain	0.0030	D;D;D;D;D
Polyphen		0.99, 0.98	.;D;.;D;.
Vest4		0.46
MutPred		0.26		.;Gain of MoRF binding (P = 0.014);.;.;.;
MVP		0.63
MPC		1.3
ClinPred		0.98	D
GERP RS		5.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.64
gMVP		0.60

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-69744904;