chr11-5947717-A-G

Variant names:

• chr11-5947717-A-G
• NM_001003443.3:c.371A>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001003443.3(OR56A3):​c.371A>G​(p.Tyr124Cys) 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. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: OR56A3 NM_001003443.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0670
• Publications: 0 publications found

Genes affected

OR56A3 (HGNC:14786): (olfactory receptor family 56 subfamily A 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

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.4110408).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OR56A3	NM_001003443.3	c.371A>G	p.Tyr124Cys	missense_variant	Exon 3 of 3	ENST00000641160.1	NP_001003443.2
OR56A3	XM_047426926.1	c.371A>G	p.Tyr124Cys	missense_variant	Exon 3 of 6		XP_047282882.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OR56A3	ENST00000641160.1	c.371A>G	p.Tyr124Cys	missense_variant	Exon 3 of 3		NM_001003443.3	ENSP00000493059.1
OR56A3	ENST00000641905.1	c.371A>G	p.Tyr124Cys	missense_variant	Exon 4 of 4			ENSP00000493319.1
OR56A3	ENST00000641878.1	n.402-970A>G		intron_variant	Intron 2 of 2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jun 10, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.371A>G (p.Y124C) alteration is located in exon 1 (coding exon 1) of the OR56A3 gene. This alteration results from a A to G substitution at nucleotide position 371, causing the tyrosine (Y) at amino acid position 124 to be replaced by a cysteine (C). 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	0.12
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.12	T;T;T
Eigen	Benign	0.14
Eigen_PC	Benign	-0.035
FATHMM_MKL	Benign	0.27	N
LIST_S2	Benign	0.84	.;.;T
M_CAP	Benign	0.0062	T
MetaRNN	Benign	0.41	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.4	M;M;M
PhyloP100		0.067
PrimateAI	Benign	0.23	T
PROVEAN	Pathogenic	-4.7	.;.;D
REVEL	Benign	0.085
Sift	Uncertain	0.0020	.;.;D
Sift4G	Uncertain	0.0030	.;.;D
Polyphen		1.0	D;D;D
Vest4		0.30
MutPred		0.40		Loss of catalytic residue at Y124 (P = 0.0483);Loss of catalytic residue at Y124 (P = 0.0483);Loss of catalytic residue at Y124 (P = 0.0483);
MVP		0.75
MPC		0.48
ClinPred		0.98	D
GERP RS		2.7
Varity_R		0.34
gMVP		0.46
Mutation Taster		=93/7	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

hg19: chr11-5968947;