12-11030480-G-C

Variant summary

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

The NM_176885.2(TAS2R31):c.856C>G(p.Leu286Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000015 in 1,461,868 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 44)
  • Exomes 𝑓: 0.000015 (0 hom.)
• Consequence: TAS2R31 NM_176885.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.214

Genes affected

TAS2R31 (HGNC:19113): (taste 2 receptor member 31) TAS2R44 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, Mar 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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TAS2R31	NM_176885.2	c.856C>G	p.Leu286Val	missense_variant	1/1	ENST00000390675.2
PRH1-TAS2R14	NM_001316893.2	c.140+4302C>G		intron_variant
PRH1-PRR4	NR_037918.2	n.477+4302C>G		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TAS2R31	ENST00000390675.2	c.856C>G	p.Leu286Val	missense_variant	1/1		NM_176885.2	P1
	ENST00000703543.1	c.-126+16540C>G		intron_variant				P1

Frequencies

GnomAD3 genomes Cov.: 44

GnomAD4 exome AF: 0.0000150 AC: 22 AN: 1461868 Hom.: 0 Cov.: 144 AF XY: 0.0000138 AC XY: 10 AN XY: 727230

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: 0.0000198

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 44

Bravo AF: 0.00000378

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

Jan 16, 2024

The c.856C>G (p.L286V) alteration is located in exon 1 (coding exon 1) of the TAS2R31 gene. This alteration results from a C to G substitution at nucleotide position 856, causing the leucine (L) at amino acid position 286 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	0.17
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.41
Cadd	Benign	23
Dann	Uncertain	1.0
DEOGEN2	Benign	0.039	T
Eigen	Benign	-0.042
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.15	N
M_CAP	Benign	0.00086	T
MetaRNN	Uncertain	0.73	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.5	M
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.33	T
PROVEAN	Uncertain	-2.5	D
REVEL	Benign	0.11
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0030	D
Polyphen		1.0	D
Vest4		0.33
MutPred		0.87		Loss of stability (P = 0.0531);
MVP		0.33
MPC		0.10
ClinPred		0.84	D
GERP RS		0.64
Varity_R		0.47
gMVP		0.064

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.41		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.41		Position offset: 1

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

Publications

LitVar

Other links and lift over

dbSNP: rs1235860455; hg19: chr12-11183079;