chr12-55130603-G-A

Position:

• chr12-55130603-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001005243.2(OR9K2):​c.769G>A​(p.Ala257Thr) 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: OR9K2 NM_001005243.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.14

Genes affected

OR9K2 (HGNC:15339): (olfactory receptor family 9 subfamily K 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_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.021996647).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR9K2	NM_001005243.2	c.769G>A	p.Ala257Thr	missense_variant	3/3	ENST00000641329.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR9K2	ENST00000641329.1	c.769G>A	p.Ala257Thr	missense_variant	3/3		NM_001005243.2	P1
OR9K2	ENST00000641374.1	c.769G>A	p.Ala257Thr	missense_variant	1/1			P1
OR9K2	ENST00000641353.1	n.196-1823G>A		intron_variant, non_coding_transcript_variant
OR9K2	ENST00000641982.1	n.183+706G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

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

Jun 02, 2023

The c.835G>A (p.A279T) alteration is located in exon 1 (coding exon 1) of the OR9K2 gene. This alteration results from a G to A substitution at nucleotide position 835, causing the alanine (A) at amino acid position 279 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	0.10
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.66
CADD	Benign	16
DANN	Benign	0.22
DEOGEN2	Benign	0.0030	.;.;T
Eigen	Benign	-0.83
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.090	N
LIST_S2	Benign	0.69	.;T;T
M_CAP	Benign	0.0031	T
MetaRNN	Benign	0.022	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-2.0	.;.;N
MutationTaster	Benign	0.84	D
PrimateAI	Benign	0.23	T
PROVEAN	Benign	3.8	.;.;N
REVEL	Benign	0.19
Sift	Benign	1.0	.;.;T
Sift4G	Benign	1.0	.;.;T
Polyphen		0.0050	.;.;B
Vest4		0.055
MutPred		0.45		.;.;Gain of catalytic residue at V280 (P = 0);
MVP		0.15
MPC		0.0091
ClinPred		0.12	T
GERP RS		4.1
Varity_R		0.068
gMVP		0.068

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs1953466077; hg19: chr12-55524387;