rs2708381

Positions:

• chr12-11061546-C-A
• chr12-11061546-C-T

Variant summary

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

The NM_176887.2(TAS2R46):​c.749G>T​(p.Trp250Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 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: 37)
• Consequence: TAS2R46 NM_176887.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.445

Genes affected

TAS2R46 (HGNC:18877): (taste 2 receptor member 46) TAS2R46 belongs to the large TAS2R receptor family. TAS2Rs are expressed on the surface of taste receptor cells and mediate the perception of bitterness through a G protein-coupled second messenger pathway (Conte et al., 2002 [PubMed 12584440]). For further information on TAS2Rs, see MIM 604791.[supplied by OMIM, Sep 2009]

PRH1-TAS2R14 (HGNC:):

PRH1 (HGNC:9366): (proline rich protein HaeIII subfamily 1) This gene encodes a member of the heterogeneous family of proline-rich salivary glycoproteins. The encoded preproprotein undergoes proteolytic processing to generate one or more mature isoforms before secretion from the parotid and submandibular/sublingual glands. Multiple distinct alleles of this locus including the parotid isoelectric-focusing variant slow (PIF-s), the parotid acidic protein (Pa), and the double band slow (Db-s) isoforms have been characterized. The reference genome encodes the Db-s allele. Certain alleles of this gene are associated with susceptibility to dental caries. This gene is located in a cluster of closely related salivary proline-rich proteins on chromosome 12. Co-transcription of this gene with adjacent genes has been observed. Alternate splicing of this gene results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Oct 2015]

TAS2R14 (HGNC:14920): (taste 2 receptor member 14) This gene product belongs to the family of candidate taste receptors that are members of the G-protein-coupled receptor superfamily. These proteins are specifically expressed in the taste receptor cells of the tongue and palate epithelia. They are organized in the genome in clusters and are genetically linked to loci that influence bitter perception in mice and humans. In functional expression studies, they respond to bitter tastants. This gene maps to the taste receptor gene cluster on chromosome 12p13. [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=0.22877836).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TAS2R46	NM_176887.2	c.749G>T	p.Trp250Leu	missense_variant	1/1	ENST00000533467.1	NP_795368.2
PRH1-TAS2R14	NM_001316893.2	c.-133-14358G>T		intron_variant			NP_001303822.1
PRH1-PRR4	NR_037918.2	n.205-14358G>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TAS2R46	ENST00000533467.1	c.749G>T	p.Trp250Leu	missense_variant	1/1		NM_176887.2	ENSP00000436450	P1
TAS2R14	ENST00000381852.4	n.153-14358G>T		intron_variant, non_coding_transcript_variant		2
PRH1	ENST00000541977.5	n.124-14358G>T		intron_variant, non_coding_transcript_variant		2
PRH1	ENST00000546265.1	n.359-14358G>T		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes Cov.: 37

GnomAD4 exome Cov.: 80

GnomAD4 genome Cov.: 37

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.52
CADD	Benign	14
DANN	Benign	0.86
DEOGEN2	Benign	0.022	T
Eigen	Benign	-0.90
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.0066	N
M_CAP	Benign	0.0029	T
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.93	T
MutationAssessor	Benign	1.5	L
MutationTaster	Benign	1.0	P
PrimateAI	Benign	0.39	T
PROVEAN	Pathogenic	-11	D
REVEL	Benign	0.11
Sift	Uncertain	0.024	D
Sift4G	Benign	0.15	T
Polyphen		0.064	B
Vest4		0.26
MutPred		0.59		Gain of catalytic residue at W250 (P = 0);
MVP		0.26
MPC		0.0024
ClinPred		0.19	T
GERP RS		-0.023
Varity_R		0.24
gMVP		0.074

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

Publications

LitVar

Other links and lift over

dbSNP: rs2708381; hg19: chr12-11214145;