12-10908496-G-A

Variant names:

• chr12-10908496-G-A
• rs1949839720
• NM_023920.2:c.803C>T

Variant summary

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

The NM_023920.2(TAS2R13):​c.803C>T​(p.Thr268Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000684 in 1,461,564 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: 32)
  • Exomes 𝑓: 0.0000068 (0 hom.)
• Consequence: TAS2R13 NM_023920.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -3.13

Genes affected

TAS2R13 (HGNC:14919): (taste 2 receptor member 13) 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]

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]

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=0.19346675).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TAS2R13	NM_023920.2	c.803C>T	p.Thr268Met	missense_variant	Exon 1 of 1	ENST00000390677.2	NP_076409.1
PRH1	NM_001291315.2	c.104-25400C>T		intron_variant	Intron 3 of 5		NP_001278244.1
PRH1	NM_001291314.2	c.-58-24221C>T		intron_variant	Intron 3 of 6		NP_001278243.1
PRH1-PRR4	NR_037918.2	n.545-24221C>T		intron_variant	Intron 4 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TAS2R13	ENST00000390677.2	c.803C>T	p.Thr268Met	missense_variant	Exon 1 of 1	6	NM_023920.2	ENSP00000375095.2
ENSG00000275778	ENST00000703543.1	c.-58-24221C>T		intron_variant	Intron 2 of 3			ENSP00000515364.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000684 AC: 10 AN: 1461564 Hom.: 0 Cov.: 30 AF XY: 0.00000688 AC XY: 5 AN XY: 727084

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: 0.00000899

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

EpiCase AF: 0.0000546

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Mar 08, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.803C>T (p.T268M) alteration is located in exon 1 (coding exon 1) of the TAS2R13 gene. This alteration results from a C to T substitution at nucleotide position 803, causing the threonine (T) at amino acid position 268 to be replaced by a methionine (M). 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	0.088
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	3.4
DANN	Uncertain	0.99
DEOGEN2	Benign	0.021	T
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.87
FATHMM_MKL	Benign	0.0015	N
M_CAP	Benign	0.0028	T
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.2	L
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.065
Sift	Benign	0.059	T
Sift4G	Benign	0.13	T
Polyphen		1.0	D
Vest4		0.16
MVP		0.27
MPC		0.024
ClinPred		0.21	T
GERP RS		-2.1
Varity_R		0.036
gMVP		0.11

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: rs1949839720; hg19: chr12-11061095; COSMIC: COSV66831685;