17-3291715-G-C

Position:

• chr17-3291715-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_002550.3(OR3A1):​c.868C>G​(p.Pro290Ala) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: OR3A1 NM_002550.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.87

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 Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.965

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR3A1	NM_002550.3	c.868C>G	p.Pro290Ala	missense_variant	2/2	ENST00000323404.2	NP_002541.2
OR3A2	NM_002551.5	c.-278-7164C>G		intron_variant			NP_002542.4
OR3A2	XM_047436157.1	c.-254-7164C>G		intron_variant			XP_047292113.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR3A1	ENST00000323404.2	c.868C>G	p.Pro290Ala	missense_variant	2/2	6	NM_002550.3	ENSP00000313803.1
OR3A2	ENST00000573901.3	c.-278-7164C>G		intron_variant		3		ENSP00000516654.1
OR3A2	ENST00000573491.5	c.-84-12562C>G		intron_variant		3		ENSP00000493118.1
OR3A2	ENST00000576166.2	c.-84-12562C>G		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

Jul 28, 2021

The c.868C>G (p.P290A) alteration is located in exon 1 (coding exon 1) of the OR3A1 gene. This alteration results from a C to G substitution at nucleotide position 868, causing the proline (P) at amino acid position 290 to be replaced by an alanine (A). 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	0.34
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Benign	-0.090
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.089	T;.
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.88	D;D
M_CAP	Benign	0.0069	T
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Uncertain	0.41	D
MutationAssessor	Pathogenic	4.1	H;.
PrimateAI	Benign	0.33	T
PROVEAN	Pathogenic	-6.5	D;.
REVEL	Uncertain	0.55
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.010	D;D
Polyphen		1.0	D;.
Vest4		0.71
MutPred		0.83		Loss of stability (P = 0.1992);.;
MVP		0.92
MPC		0.19
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.92
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: chr17-3195009;