11-4946638-T-G

Position:

• chr11-4946638-T-G

Variant summary

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

The NM_001005329.2(OR51A4):​c.463A>C​(p.Met155Leu) 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M155R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000028 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: OR51A4 NM_001005329.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.09

Genes affected

OR51A4 (HGNC:14795): (olfactory receptor family 51 subfamily A member 4) 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]

MMP26 (HGNC:14249): (matrix metallopeptidase 26) Proteins of the matrix metalloproteinase (MMP) family are involved in the breakdown of extracellular matrix in normal physiological processes, such as embryonic development, reproduction, and tissue remodeling, as well as in disease processes, such as arthritis and metastasis. The encoded preproprotein is proteolytically processed to generate the mature enzyme. This enzyme may degrade collagen type IV, fibronectin, fibrinogen, and beta-casein, and activate matrix metalloproteinase-9 by cleavage. The protein differs from most MMP family members in that it lacks a conserved C-terminal protein domain. The encoded protein may promote cell invasion in multiple human cancers. [provided by RefSeq, May 2016]

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=0.07393718).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR51A4	NM_001005329.2	c.463A>C	p.Met155Leu	missense_variant	2/2	ENST00000641898.1
MMP26	NM_021801.5	c.-144-41430T>G		intron_variant		ENST00000380390.6
MMP26	NM_001384608.1	c.-152-41632T>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR51A4	ENST00000641898.1	c.463A>C	p.Met155Leu	missense_variant	2/2		NM_001005329.2	P1
MMP26	ENST00000380390.6	c.-144-41430T>G		intron_variant		5	NM_021801.5	P1
MMP26	ENST00000300762.2	c.-152-41632T>G		intron_variant		1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000279 AC: 4 AN: 1434766 Hom.: 0 Cov.: 83 AF XY: 0.00000420 AC XY: 3 AN XY: 714686

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000168

GnomAD4 genome Cov.: 31

Alfa AF: 0.0000480 Hom.: 0

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

Dec 15, 2023

The c.463A>C (p.M155L) alteration is located in exon 1 (coding exon 1) of the OR51A4 gene. This alteration results from a A to C substitution at nucleotide position 463, causing the methionine (M) at amino acid position 155 to be replaced by a leucine (L). 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	0.076
BayesDel_addAF	Benign	-0.49	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	0.041
DANN	Benign	0.83
DEOGEN2	Benign	0.0015	T;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.073	N
LIST_S2	Benign	0.097	.;T
M_CAP	Benign	0.0022	T
MetaRNN	Benign	0.074	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-1.1	N;N
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	0.15	.;N
REVEL	Benign	0.019
Sift	Benign	0.20	.;T
Sift4G	Benign	0.36	.;T
Polyphen		0.0	B;B
Vest4		0.10
MutPred		0.33		Loss of ubiquitination at K153 (P = 0.1306);Loss of ubiquitination at K153 (P = 0.1306);
MVP		0.14
MPC		0.39
ClinPred		0.042	T
GERP RS		-5.5
Varity_R		0.091
gMVP		0.090

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: rs1473789414; hg19: chr11-4967868; COSMIC: COSV105306522;