chr6-29588386-G-A

Position:

• chr6-29588386-G-A

Variant summary

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

The NM_007160.4(OR2H2):​c.442G>A​(p.Val148Ile) 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: OR2H2 NM_007160.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.20

Genes affected

OR2H2 (HGNC:8253): (olfactory receptor family 2 subfamily H 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]

GABBR1 (HGNC:4070): (gamma-aminobutyric acid type B receptor subunit 1) This gene encodes a receptor for gamma-aminobutyric acid (GABA), which is the main inhibitory neurotransmitter in the mammalian central nervous system. This receptor functions as a heterodimer with GABA(B) receptor 2. Defects in this gene may underlie brain disorders such as schizophrenia and epilepsy. Alternative splicing generates multiple transcript variants, but the full-length nature of some of these variants has not been determined. [provided by RefSeq, Jan 2016]

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=0.042686075).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR2H2	NM_007160.4	c.442G>A	p.Val148Ile	missense_variant	2/2	ENST00000641840.1	NP_009091.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR2H2	ENST00000641840.1	c.442G>A	p.Val148Ile	missense_variant	2/2		NM_007160.4	ENSP00000492959.1
OR2H2	ENST00000383640.4	c.442G>A	p.Val148Ile	missense_variant	1/1	6		ENSP00000373136.2
GABBR1	ENST00000355973.7	c.*2+15155C>T		intron_variant		2		ENSP00000348248.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

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

Aug 12, 2024

The c.442G>A (p.V148I) alteration is located in exon 1 (coding exon 1) of the OR2H2 gene. This alteration results from a G to A substitution at nucleotide position 442, causing the valine (V) at amino acid position 148 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	0.083
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	2.2
DANN	Benign	0.87
DEOGEN2	Benign	0.0014	T;T
Eigen	Benign	-0.83
Eigen_PC	Benign	-0.77
FATHMM_MKL	Benign	0.10	N
M_CAP	Benign	0.0024	T
MetaRNN	Benign	0.043	T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.13	N;N
PrimateAI	Benign	0.24	T
PROVEAN	Benign	0.16	.;N
REVEL	Benign	0.032
Sift	Benign	0.40	.;T
Sift4G	Benign	0.64	.;T
Polyphen		0.0010	B;B
Vest4		0.037
MutPred		0.34		Loss of sheet (P = 0.1907);Loss of sheet (P = 0.1907);
MVP		0.13
MPC		0.15
ClinPred		0.043	T
GERP RS		2.4
Varity_R		0.032
gMVP		0.064

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1484179995; hg19: chr6-29556163;