chr7-144004666-A-G

Position:

• chr7-144004666-A-G

Variant summary

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

The NM_001005281.3(OR6B1):​c.670A>G​(p.Thr224Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,884 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: OR6B1 NM_001005281.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.807

Genes affected

OR6B1 (HGNC:8354): (olfactory receptor family 6 subfamily B 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=0.16970327).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OR6B1	NM_001005281.3	c.670A>G	p.Thr224Ala	missense_variant	2/2	ENST00000641698.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OR6B1	ENST00000641698.1	c.670A>G	p.Thr224Ala	missense_variant	2/2		NM_001005281.3	P1
OR6B1	ENST00000408922.3	c.670A>G	p.Thr224Ala	missense_variant	1/1			P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461884 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

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 25, 2023

The c.670A>G (p.T224A) alteration is located in exon 1 (coding exon 1) of the OR6B1 gene. This alteration results from a A to G substitution at nucleotide position 670, causing the threonine (T) at amino acid position 224 to be replaced by an alanine (A). 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	0.066
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.0047	T;T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.11
FATHMM_MKL	Benign	0.18	N
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.17	T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.23	N;N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.65	.;N
REVEL	Benign	0.16
Sift	Benign	0.62	.;T
Sift4G	Benign	0.46	.;T
Polyphen		0.33	B;B
Vest4		0.15
MutPred		0.67		Gain of catalytic residue at T224 (P = 0.1287);Gain of catalytic residue at T224 (P = 0.1287);
MVP		0.59
MPC		0.12
ClinPred		0.39	T
GERP RS		5.2
Varity_R		0.095
gMVP		0.17

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: chr7-143701759;