7-143026726-G-A

Position:

• chr7-143026726-G-A

Variant summary

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

The NM_001001658.1(OR9A2):​c.407C>T​(p.Thr136Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000197 in 152,102 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.000020 (0 hom., cov: 32)
• Consequence: OR9A2 NM_001001658.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.888

Genes affected

OR9A2 (HGNC:15093): (olfactory receptor family 9 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 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=0.14432338).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR9A2	NM_001001658.1	c.407C>T	p.Thr136Ile	missense_variant	1/1	ENST00000350513.3	NP_001001658.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR9A2	ENST00000350513.3	c.407C>T	p.Thr136Ile	missense_variant	1/1	6	NM_001001658.1	ENSP00000316518.3

Frequencies

GnomAD3 genomes AF: 0.0000197 AC: 3 AN: 152102 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000725

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.: 32

GnomAD4 genome AF: 0.0000197 AC: 3 AN: 152102 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74284

Gnomad4 AFR AF: 0.0000725

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

Bravo AF: 0.0000151

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 31, 2024

The c.407C>T (p.T136I) alteration is located in exon 1 (coding exon 1) of the OR9A2 gene. This alteration results from a C to T substitution at nucleotide position 407, causing the threonine (T) at amino acid position 136 to be replaced by an isoleucine (I). 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	-0.27	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0062	T
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.24
FATHMM_MKL	Benign	0.024	N
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.0030	T
MetaRNN	Benign	0.14	T
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	-0.32	N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	1.3	N
REVEL	Benign	0.058
Sift	Benign	0.18	T
Sift4G	Benign	0.22	T
Polyphen		0.92	P
Vest4		0.12
MutPred		0.41		Loss of glycosylation at S135 (P = 0.1235);
MVP		0.39
MPC		0.76
ClinPred		0.59	D
GERP RS		2.8
Varity_R		0.051
gMVP		0.56

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: rs887658484; hg19: chr7-142723813;