17-3126810-C-T

Position:

• chr17-3126810-C-T

Variant summary

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

The NM_003555.1(OR1G1):​c.742G>A​(p.Val248Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,690 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: OR1G1 NM_003555.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0180

Genes affected

OR1G1 (HGNC:8204): (olfactory receptor family 1 subfamily G member 1) 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=0.21745294).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR1G1	NM_003555.1	c.742G>A	p.Val248Ile	missense_variant	1/1	ENST00000328890.3	NP_003546.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR1G1	ENST00000328890.3	c.742G>A	p.Val248Ile	missense_variant	1/1	6	NM_003555.1	ENSP00000331545.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461690 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727130

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

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 05, 2024

The c.742G>A (p.V248I) alteration is located in exon 1 (coding exon 1) of the OR1G1 gene. This alteration results from a G to A substitution at nucleotide position 742, causing the valine (V) at amino acid position 248 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	0.093
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0070	T
Eigen	Benign	0.10
Eigen_PC	Benign	0.072
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.0018	T
MetaRNN	Benign	0.22	T
MetaSVM	Benign	-0.93	T
MutationAssessor	Uncertain	2.3	M
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.96	N
REVEL	Benign	0.095
Sift	Uncertain	0.015	D
Sift4G	Uncertain	0.0060	D
Polyphen		0.61	P
Vest4		0.13
MutPred		0.67		Loss of catalytic residue at V248 (P = 0.0264);
MVP		0.31
MPC		0.27
ClinPred		0.78	D
GERP RS		4.6
Varity_R		0.32
gMVP		0.095

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs2047999102; hg19: chr17-3030104;