12-11061401-C-G

Variant names:

• chr12-11061401-C-G
• rs778835386
• NM_176887.2:c.894G>C

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_176887.2(TAS2R46):​c.894G>C​(p.Arg298Ser) 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. 14/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar.

• Frequency: Genomes: not found (cov: 34)
• Consequence: TAS2R46 NM_176887.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.721
• Publications: 0 publications found

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]

ENSG00000275778 (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]

PRR4 (HGNC:18020): (proline rich 4) This gene encodes a member of the proline-rich protein family that lacks a conserved repetitive domain. This protein may play a role in protective functions in the eye. Alternative splicing result in multiple transcript variants. Read-through transcription also exists between this gene and the upstream PRH1 (proline-rich protein HaeIII subfamily 1) gene. [provided by RefSeq, Feb 2011]

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

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=0.27818602).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_176887.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAS2R46	NM_176887.2	MANE Select	c.894G>C	p.Arg298Ser	missense	Exon 1 of 1	NP_795368.2	P59540
	PRH1	NM_001291315.2		c.-133-14213G>C		intron	N/A	NP_001278244.1
	PRH1	NM_001291314.2		c.-294-14213G>C		intron	N/A	NP_001278243.1	A0A087WV42

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAS2R46	ENST00000533467.1	TSL:6 MANE Select	c.894G>C	p.Arg298Ser	missense	Exon 1 of 1	ENSP00000436450.1	P59540
	ENSG00000275778	ENST00000536668.2	TSL:5	n.-164-14213G>C		intron	N/A	ENSP00000482961.1	A0A087WZY1
	PRR4	ENST00000535024.7	TSL:5	c.-133-14213G>C		intron	N/A	ENSP00000481571.3	A0A087WY73

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 34

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	15
DANN	Benign	0.97
DEOGEN2	Benign	0.013	T
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.68
FATHMM_MKL	Benign	0.025	N
M_CAP	Benign	0.0035	T
MetaRNN	Benign	0.28	T
MetaSVM	Benign	-0.94	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		-0.72
PrimateAI	Benign	0.27	T
PROVEAN	Uncertain	-3.3	D
REVEL	Benign	0.045
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0060	D
Polyphen		0.96	D
Vest4		0.24
MutPred		0.60		Gain of catalytic residue at W295 (P = 2e-04)
MVP		0.49
MPC		0.0061
ClinPred		0.78	D
GERP RS		-0.58
Varity_R		0.18
gMVP		0.096
Mutation Taster		=99/1	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs778835386; hg19: chr12-11214000;