1-247921708-G-A

Position:

• chr1-247921708-G-A

Variant summary

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

The NM_001005522.2(OR2T8):​c.691G>A​(p.Ala231Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000712 in 140,412 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.0000071 (0 hom., cov: 17)
• Consequence: OR2T8 NM_001005522.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.332

Genes affected

OR2T8 (HGNC:15020): (olfactory receptor family 2 subfamily T member 8) 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=0.22275513).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR2T8	NM_001005522.2	c.691G>A	p.Ala231Thr	missense_variant	2/2	ENST00000641945.2	NP_001005522.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR2T8	ENST00000641945.2	c.691G>A	p.Ala231Thr	missense_variant	2/2		NM_001005522.2	ENSP00000493286	P1

Frequencies

GnomAD3 genomes AF: 0.00000712 AC: 1 AN: 140412 Hom.: 0 Cov.: 17

Gnomad AFR AF: 0.0000261

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 29

GnomAD4 genome AF: 0.00000712 AC: 1 AN: 140412 Hom.: 0 Cov.: 17 AF XY: 0.00 AC XY: 0 AN XY: 67514

Gnomad4 AFR AF: 0.0000261

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

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

Jan 23, 2023

The c.691G>A (p.A231T) alteration is located in exon 1 (coding exon 1) of the OR2T8 gene. This alteration results from a G to A substitution at nucleotide position 691, causing the alanine (A) at amino acid position 231 to be replaced by a threonine (T). 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	0.13
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.014	T;T
Eigen	Benign	-0.16
Eigen_PC	Benign	-0.37
FATHMM_MKL	Benign	0.087	N
LIST_S2	Benign	0.74	.;T
M_CAP	Benign	0.00040	T
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	2.0	M;M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.21	T
PROVEAN	Uncertain	-2.6	.;D
REVEL	Benign	0.085
Sift	Uncertain	0.019	.;D
Sift4G	Uncertain	0.0050	.;D
Polyphen		0.83	P;P
Vest4		0.11
MutPred		0.48		Gain of phosphorylation at A231 (P = 0.0471);Gain of phosphorylation at A231 (P = 0.0471);
MVP		0.33
ClinPred		0.91	D
GERP RS		3.6
Varity_R		0.30
gMVP		0.045

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs747032969; hg19: chr1-248085010;