chr14-20640948-C-G

Variant names:

• chr14-20640948-C-G
• rs199883538
• NM_001001968.1:c.744G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001001968.1(OR6S1):​c.744G>C​(p.Leu248Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000149 in 1,613,944 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 30)
  • Exomes 𝑓: 0.000014 (0 hom.)
• Consequence: OR6S1 NM_001001968.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0500
• Publications: 1 publications found

Genes affected

OR6S1 (HGNC:15363): (olfactory receptor family 6 subfamily S 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

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.15954676).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OR6S1	NM_001001968.1	c.744G>C	p.Leu248Phe	missense_variant	Exon 1 of 1	ENST00000320704.3	NP_001001968.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OR6S1	ENST00000320704.3	c.744G>C	p.Leu248Phe	missense_variant	Exon 1 of 1	6	NM_001001968.1	ENSP00000313110.3

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152126 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00115

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000239 AC: 6 AN: 251360 AF XY: 0.0000294

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000397

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000137 AC: 20 AN: 1461818 Hom.: 0 Cov.: 37 AF XY: 0.0000179 AC XY: 13 AN XY: 727216

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.000497 AC: 13 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53374

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1111990

Other (OTH) AF: 0.0000662 AC: 4 AN: 60394

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152126 Hom.: 0 Cov.: 30 AF XY: 0.0000269 AC XY: 2 AN XY: 74318

African (AFR) AF: 0.00 AC: 0 AN: 41414

American (AMR) AF: 0.00 AC: 0 AN: 15280

Ashkenazi Jewish (ASJ) AF: 0.00115 AC: 4 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10610

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.0000450 Hom.: 0

Bravo AF: 0.0000189

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jun 09, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.744G>C (p.L248F) alteration is located in exon 1 (coding exon 1) of the OR6S1 gene. This alteration results from a G to C substitution at nucleotide position 744, causing the leucine (L) at amino acid position 248 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	0.20
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.0062	T
Eigen	Benign	0.18
Eigen_PC	Benign	0.15
FATHMM_MKL	Benign	0.42	N
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.0081	T
MetaRNN	Benign	0.16	T
MetaSVM	Benign	-0.70	T
MutationAssessor	Benign	1.5	L
PhyloP100		-0.050
PrimateAI	Benign	0.34	T
PROVEAN	Uncertain	-3.0	D
REVEL	Benign	0.13
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.043	D
Polyphen		0.92	P
Vest4		0.24
MutPred		0.37		Gain of catalytic residue at V250 (P = 0.0016);
MVP		0.71
MPC		0.097
ClinPred		0.62	D
GERP RS		4.7
Varity_R		0.38
gMVP		0.17
Mutation Taster		=98/2	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs199883538; hg19: chr14-21109107;