12-10908731-G-C

Position:

• chr12-10908731-G-C

Variant summary

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

The NM_023920.2(TAS2R13):​c.568C>G​(p.Pro190Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: TAS2R13 NM_023920.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.10

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 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TAS2R13	NM_023920.2	c.568C>G	p.Pro190Ala	missense_variant	1/1	ENST00000390677.2	NP_076409.1
PRH1	NM_001291315.2	c.104-25635C>G		intron_variant			NP_001278244.1
PRH1	NM_001291314.2	c.-58-24456C>G		intron_variant			NP_001278243.1
PRH1-PRR4	NR_037918.2	n.545-24456C>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TAS2R13	ENST00000390677.2	c.568C>G	p.Pro190Ala	missense_variant	1/1	6	NM_023920.2	ENSP00000375095.2
ENSG00000275778	ENST00000703543.1	c.-58-24456C>G		intron_variant				ENSP00000515364.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

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

Nov 08, 2021

The c.568C>G (p.P190A) alteration is located in exon 1 (coding exon 1) of the TAS2R13 gene. This alteration results from a C to G substitution at nucleotide position 568, causing the proline (P) at amino acid position 190 to be replaced by an alanine (A). 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	-0.00096	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T
Eigen	Uncertain	0.24
Eigen_PC	Benign	-0.048
FATHMM_MKL	Benign	0.057	N
M_CAP	Benign	0.0041	T
MetaRNN	Uncertain	0.69	D
MetaSVM	Benign	-0.63	T
MutationAssessor	Pathogenic	3.2	M
PrimateAI	Benign	0.29	T
PROVEAN	Pathogenic	-7.3	D
REVEL	Benign	0.20
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0050	D
Polyphen		1.0	D
Vest4		0.29
MutPred		0.74		Gain of catalytic residue at A194 (P = 5e-04);
MVP		0.73
MPC		0.097
ClinPred		0.91	D
GERP RS		2.4
Varity_R		0.50
gMVP		0.090

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-11061330;