1-248273312-C-G

Position:

• chr1-248273312-C-G

Variant summary

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

The NM_001004695.2(OR2T33):​c.503G>C​(p.Gly168Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000048 in 1,458,940 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: OR2T33 NM_001004695.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.278

Genes affected

OR2T33 (HGNC:31255): (olfactory receptor family 2 subfamily T member 33) 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=0.19401386).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR2T33	NM_001004695.2	c.503G>C	p.Gly168Ala	missense_variant	2/2	ENST00000641220.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR2T33	ENST00000641220.1	c.503G>C	p.Gly168Ala	missense_variant	2/2		NM_001004695.2	P1
OR2T33	ENST00000318021.4	c.503G>C	p.Gly168Ala	missense_variant	1/1			P1

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome AF: 0.00000480 AC: 7 AN: 1458940 Hom.: 0 Cov.: 81 AF XY: 0.00000827 AC XY: 6 AN XY: 725816

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000630

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 29

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.00000756

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 17, 2022

The c.503G>C (p.G168A) alteration is located in exon 1 (coding exon 1) of the OR2T33 gene. This alteration results from a G to C substitution at nucleotide position 503, causing the glycine (G) at amino acid position 168 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	0.11
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	7.7
DANN	Benign	0.75
DEOGEN2	Benign	0.013	T;T
Eigen	Benign	-0.96
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.055	N
LIST_S2	Benign	0.12	.;T
M_CAP	Benign	0.0025	T
MetaRNN	Benign	0.19	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.22	T
PROVEAN	Benign	-2.1	.;N
REVEL	Benign	0.048
Sift	Benign	0.15	.;T
Sift4G	Benign	0.22	.;T
Polyphen		0.13	B;B
Vest4		0.16
MutPred		0.63		Gain of catalytic residue at G168 (P = 0.1798);Gain of catalytic residue at G168 (P = 0.1798);
MVP		0.35
MPC		1.3
ClinPred		0.11	T
GERP RS		-0.65
Varity_R		0.11
gMVP		0.20

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

LitVar

Other links and lift over

dbSNP: rs1466428614; hg19: chr1-248436614;