chr7-144258823-T-C

Position:

• chr7-144258823-T-C

Variant summary

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

The NM_001005328.2(OR2A7):​c.806A>G​(p.Gln269Arg) 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. 15/20 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. Q269K) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 21)
• Consequence: OR2A7 NM_001005328.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0320

Genes affected

OR2A7 (HGNC:8234): (olfactory receptor family 2 subfamily A member 7) 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]

ARHGEF35-AS1 (HGNC:41292): (ARHGEF35 antisense RNA 1)

OR2A1-AS1 (HGNC:):

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=0.0578261).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR2A7	NM_001005328.2	c.806A>G	p.Gln269Arg	missense_variant	2/2	ENST00000641841.1
ARHGEF35-AS1	NR_126022.1	n.494-21649T>C		intron_variant, non_coding_transcript_variant
OR2A1-AS1	NR_126023.1	n.608-19080A>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR2A7	ENST00000641841.1	c.806A>G	p.Gln269Arg	missense_variant	2/2		NM_001005328.2	P1
ARHGEF35-AS1	ENST00000460955.5	n.494-21649T>C		intron_variant, non_coding_transcript_variant		4
OR2A7	ENST00000493325.1	c.806A>G	p.Gln269Arg	missense_variant	1/1			P1

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 21

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 04, 2023

The c.806A>G (p.Q269R) alteration is located in exon 1 (coding exon 1) of the OR2A7 gene. This alteration results from a A to G substitution at nucleotide position 806, causing the glutamine (Q) at amino acid position 269 to be replaced by an arginine (R). 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	0.088
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	19
DANN	Benign	0.96
DEOGEN2	Benign	0.0097	T;T
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.51
FATHMM_MKL	Benign	0.055	N
M_CAP	Benign	0.0023	T
MetaRNN	Benign	0.058	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.6	L;L
MutationTaster	Benign	0.53	N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-2.2	.;N
REVEL	Benign	0.063
Sift	Benign	0.28	.;T
Sift4G	Benign	0.25	.;T
Polyphen		0.0090	B;B
Vest4		0.095
MutPred		0.30		Loss of methylation at K271 (P = 0.1176);Loss of methylation at K271 (P = 0.1176);
MVP		0.45
ClinPred		0.063	T
GERP RS		3.2
Varity_R		0.14
gMVP		0.095

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-143955916;