chr16-69710992-A-T

Position:

• chr16-69710992-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000903.3(NQO1):​c.809T>A​(p.Ile270Asn) variant causes a missense change involving the alteration of a non-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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: NQO1 NM_000903.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.67

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.25020695).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NQO1	NM_000903.3	c.809T>A	p.Ile270Asn	missense_variant	6/6	ENST00000320623.10	NP_000894.1
NQO1	NM_001025433.2	c.707T>A	p.Ile236Asn	missense_variant	5/5		NP_001020604.1
NQO1	NM_001025434.2	c.695T>A	p.Ile232Asn	missense_variant	5/5		NP_001020605.1
NQO1	NM_001286137.2	c.593T>A	p.Ile198Asn	missense_variant	4/4		NP_001273066.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NQO1	ENST00000320623.10	c.809T>A	p.Ile270Asn	missense_variant	6/6	1	NM_000903.3	ENSP00000319788	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

Jun 08, 2023

The p.I270N variant (also known as c.809T>A), located in coding exon 6 of the NQO1 gene, results from a T to A substitution at nucleotide position 809. The isoleucine at codon 270 is replaced by asparagine, an amino acid with 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	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.15	.;T;.;.;T
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.91	D;D;D;D;D
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.25	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.7	.;L;.;.;.
MutationTaster	Benign	0.90	D;D;D;D;D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-1.6	N;N;N;N;N
REVEL	Benign	0.042
Sift	Uncertain	0.0020	D;D;D;D;D
Sift4G	Uncertain	0.0080	D;D;D;D;D
Polyphen		0.98, 0.88	.;D;.;P;.
Vest4		0.40
MutPred		0.30		.;Gain of relative solvent accessibility (P = 0.0215);.;.;.;
MVP		0.46
MPC		0.94
ClinPred		0.87	D
GERP RS		4.8
Varity_R		0.67
gMVP		0.31

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: chr16-69744895;