2-240045441-A-C

Position:

• chr2-240045441-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_173351.2(OR6B3):​c.632T>G​(p.Leu211Arg) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 29)
• Consequence: OR6B3 NM_173351.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.24

Genes affected

OR6B3 (HGNC:15042): (olfactory receptor family 6 subfamily B member 3) 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 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.853

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR6B3	NM_173351.2	c.632T>G	p.Leu211Arg	missense_variant	3/3	ENST00000641019.2	NP_775486.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR6B3	ENST00000641019.2	c.632T>G	p.Leu211Arg	missense_variant	3/3		NM_173351.2	ENSP00000493035	P1

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 29

Bravo AF: 0.0000113

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

May 14, 2024

The c.632T>G (p.L211R) alteration is located in exon 1 (coding exon 1) of the OR6B3 gene. This alteration results from a T to G substitution at nucleotide position 632, causing the leucine (L) at amino acid position 211 to be replaced by an arginine (R). 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	Uncertain	0.48
BayesDel_addAF	Uncertain	0.030	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.14	T;T
Eigen	Benign	0.17
Eigen_PC	Benign	-0.11
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.82	T;.
M_CAP	Benign	0.0034	T
MetaRNN	Pathogenic	0.85	D;D
MetaSVM	Benign	-0.49	T
MutationAssessor	Pathogenic	3.3	M;M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.22	T
PROVEAN	Pathogenic	-5.9	D;.
REVEL	Benign	0.24
Sift	Uncertain	0.0020	D;.
Sift4G	Uncertain	0.0080	D;.
Polyphen		1.0	D;D
Vest4		0.57
MutPred		0.79		Gain of methylation at L211 (P = 0.0385);Gain of methylation at L211 (P = 0.0385);
MVP		0.73
MPC		2.1
ClinPred		0.86	D
GERP RS		4.1
Varity_R		0.95
gMVP		0.71

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

LitVar

Other links and lift over

dbSNP: rs771727205; hg19: chr2-240984858;