rs202070898

Variant names:

• chr17-3278109-G-A
• rs202070898
• ENST00000573901.3:c.809C>T

Your query was ambiguous. Multiple possible variants found:

• chr17-3278109-G-A
• chr17-3278109-G-C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000573901.3(OR3A2):​c.809C>T​(p.Ala270Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign 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. A270G) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: OR3A2 ENST00000573901.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0490
• Publications: 0 publications found

Genes affected

OR3A2 (HGNC:8283): (olfactory receptor family 3 subfamily A member 2) Olfactory receptors interact with odorant molecules in the nose, to initiate a neuronal response that triggers the perception of a smell. The olfactory receptor proteins are members of a large family of G-protein-coupled receptors (GPCR) arising from single coding-exon genes. Olfactory receptors share a 7-transmembrane domain structure with many neurotransmitter and hormone receptors and are responsible for the recognition and G protein-mediated transduction of odorant signals. The olfactory receptor gene family is the largest in the genome. The nomenclature assigned to the olfactory receptor genes and proteins for this organism is independent of other organisms. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13647974).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OR3A2	NM_002551.5	c.809C>T	p.Ala270Val	missense_variant	Exon 5 of 5		NP_002542.4
OR3A2	XM_047436157.1	c.833C>T	p.Ala278Val	missense_variant	Exon 7 of 7		XP_047292113.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OR3A2	ENST00000573901.3	c.809C>T	p.Ala270Val	missense_variant	Exon 5 of 5	3		ENSP00000516654.1
OR3A2	ENST00000641164.1	c.809C>T	p.Ala270Val	missense_variant	Exon 1 of 1			ENSP00000493039.1
OR3A2	ENST00000642052.1	c.809C>T	p.Ala270Val	missense_variant	Exon 2 of 2			ENSP00000493441.1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461888 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727248

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

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

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112008

Other (OTH) AF: 0.00 AC: 0 AN: 60396

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.093
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	14
DANN	Uncertain	0.98
DEOGEN2	Benign	0.031	.;.;T
Eigen	Benign	-0.86
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.10	N
LIST_S2	Benign	0.23	.;T;T
M_CAP	Benign	0.0020	T
MetaRNN	Benign	0.14	T;T;T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.5	.;.;L
PhyloP100		0.049
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-2.2	.;.;N
REVEL	Benign	0.056
Sift	Benign	0.030	.;.;D
Sift4G	Uncertain	0.031	.;.;D
Polyphen		0.0060	.;.;B
Vest4		0.052
MutPred		0.62		.;.;Gain of methylation at K279 (P = 0.0829);
MVP		0.23
MPC		0.76
ClinPred		0.28	T
GERP RS		1.8
Varity_R		0.12
gMVP		0.047

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs202070898; hg19: chr17-3181403;