8-166484-G-A

Position:

• chr8-166484-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001005504.1(OR4F21):​c.541C>T​(p.Leu181Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 6)
  • Exomes 𝑓: 0.0000059 (1 hom.)
  • Failed GnomAD Quality Control
• Consequence: OR4F21 NM_001005504.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.220

Genes affected

OR4F21 (HGNC:19583): (olfactory receptor family 4 subfamily F member 21) 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 Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.09911406).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OR4F21	NM_001005504.1	c.541C>T	p.Leu181Phe	missense_variant	1/1	ENST00000320901.4	NP_001005504.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OR4F21	ENST00000320901.4	c.541C>T	p.Leu181Phe	missense_variant	1/1	6	NM_001005504.1	ENSP00000318878.3

Frequencies

GnomAD3 genomes Cov.: 6

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000589 AC: 3 AN: 508926 Hom.: 1 Cov.: 5 AF XY: 0.00000370 AC XY: 1 AN XY: 270406

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: 0.00000968

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 6

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

Jun 16, 2023

The c.541C>T (p.L181F) alteration is located in exon 1 (coding exon 1) of the OR4F21 gene. This alteration results from a C to T substitution at nucleotide position 541, causing the leucine (L) at amino acid position 181 to be replaced by a phenylalanine (F). 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	0.14
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	14
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0078	T
Eigen	Benign	-0.38
Eigen_PC	Benign	-0.45
FATHMM_MKL	Benign	0.016	N
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.0015	T
MetaRNN	Benign	0.099	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.54	N
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-1.4	N
REVEL	Benign	0.062
Sift	Benign	0.36	T
Sift4G	Benign	0.20	T
Polyphen		0.33	B
Vest4		0.13
MutPred		0.48		Loss of methylation at R186 (P = 0.2684);
MVP		0.16
ClinPred		0.28	T
GERP RS		2.0
Varity_R		0.056
gMVP		0.073

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1310295945; hg19: chr8-116484;