17-3291906-G-A

Position:

• chr17-3291906-G-A

Variant summary

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

The NM_002550.3(OR3A1):​c.677C>T​(p.Ala226Val) 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. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OR3A1 NM_002550.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.415

Genes affected

OR3A1 (HGNC:8282): (olfactory receptor family 3 subfamily A member 1) 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]

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

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=0.13720432).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR3A1	NM_002550.3	c.677C>T	p.Ala226Val	missense_variant	2/2	ENST00000323404.2	NP_002541.2
OR3A2	NM_002551.5	c.-278-7355C>T		intron_variant			NP_002542.4
OR3A2	XM_047436157.1	c.-255+7200C>T		intron_variant			XP_047292113.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR3A1	ENST00000323404.2	c.677C>T	p.Ala226Val	missense_variant	2/2	6	NM_002550.3	ENSP00000313803.1
OR3A2	ENST00000573901.3	c.-278-7355C>T		intron_variant		3		ENSP00000516654.1
OR3A2	ENST00000573491.5	c.-84-12753C>T		intron_variant		3		ENSP00000493118.1
OR3A2	ENST00000576166.2	c.-84-12753C>T		intron_variant		5		ENSP00000493095.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

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

Nov 27, 2024

The c.677C>T (p.A226V) alteration is located in exon 1 (coding exon 1) of the OR3A1 gene. This alteration results from a C to T substitution at nucleotide position 677, causing the alanine (A) at amino acid position 226 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.097
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
CADD	Benign	12
DANN	Benign	0.81
DEOGEN2	Benign	0.014	T;.
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.034	N
LIST_S2	Benign	0.15	T;T
M_CAP	Benign	0.0028	T
MetaRNN	Benign	0.14	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.70	N;.
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-1.7	N;.
REVEL	Benign	0.035
Sift	Benign	0.21	T;.
Sift4G	Benign	0.56	T;T
Polyphen		0.0050	B;.
Vest4		0.16
MutPred		0.60		Gain of MoRF binding (P = 0.1426);.;
MVP		0.13
MPC		0.030
ClinPred		0.10	T
GERP RS		-3.1
Varity_R		0.061
gMVP		0.085

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: chr17-3195200;