Genetic Variant OR8B8:p.Ala300Val (chr11-124440187-G-A) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_012378.2(OR8B8):c.899C>T(p.Ala300Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,834 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

OR8B8
NM_012378.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.86

Publications

0 publications found

Variant links:

Genes affected

OR8B8 (HGNC:8477): (olfactory receptor family 8 subfamily B member 8) 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]

OR8B8 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.363302).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OR8B8	NM_012378.2 link	c.899C>T	p.Ala300Val	missense_variant	Exon 3 of 3	ENST00000642064.1	NP_036510.1	Q15620A0A126GW73

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OR8B8	ENST00000642064.1 link	c.899C>T	p.Ala300Val	missense_variant	Exon 3 of 3		NM_012378.2	ENSP00000493014.1		Q15620
OR8B8	ENST00000328064.2 link	c.899C>T	p.Ala300Val	missense_variant	Exon 1 of 1	6		ENSP00000330280.2		Q15620

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460834

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726718

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33374

American (AMR)

AF:

0.00

AC:

AN:

44408

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26056

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39692

South Asian (SAS)

AF:

0.00

AC:

AN:

86132

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53382

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111684

Other (OTH)

AF:

0.00

AC:

AN:

60346

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 27, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.899C>T (p.A300V) alteration is located in exon 1 (coding exon 1) of the OR8B8 gene. This alteration results from a C to T substitution at nucleotide position 899, causing the alanine (A) at amino acid position 300 to be replaced by a valine (V). 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

0.20

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.46

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.016

T;T

Eigen

Benign

0.16

Eigen_PC

Benign

-0.016

FATHMM_MKL

Benign

0.15

LIST_S2

Uncertain

0.86

.;D

M_CAP

Benign

0.011

MetaRNN

Benign

0.36

T;T

MetaSVM

Benign

-0.88

MutationAssessor

Uncertain

2.5

M;M

PhyloP100

2.9

PrimateAI

Benign

0.23

PROVEAN

Uncertain

-3.4

.;D

REVEL

Benign

0.16

Sift

Uncertain

0.011

.;D

Sift4G

Uncertain

0.010

.;D

Polyphen

0.94

P;P

Vest4

0.22

MutPred

0.63

Loss of helix (P = 0.0104);Loss of helix (P = 0.0104);

MVP

0.69

MPC

0.044

ClinPred

0.98

GERP RS

2.9

Varity_R

0.23

gMVP

0.25

Mutation Taster

=99/1

polymorphism

(source)

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

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11-124440187-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over