chr7-141972905-G-T

Variant names:

• chr7-141972905-G-T
• rs1726866
• NM_176817.5:c.785C>A

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_176817.5(TAS2R38):​c.785C>A​(p.Ala262Asp) 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 pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 30)
• Consequence: TAS2R38 NM_176817.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.23
• Publications: 0 publications found

Genes affected

TAS2R38 (HGNC:9584): (taste 2 receptor member 38) This gene encodes a seven-transmembrane G protein-coupled receptor that controls the ability to taste glucosinolates, a family of bitter-tasting compounds found in plants of the Brassica sp. Synthetic compounds phenylthiocarbamide (PTC) and 6-n-propylthiouracil (PROP) have been identified as ligands for this receptor and have been used to test the genetic diversity of this gene. Although several allelic forms of this gene have been identified worldwide, there are two predominant common forms (taster and non-taster) found outside of Africa. These alleles differ at three nucleotide positions resulting in amino acid changes in the protein (A49P, A262V, and V296I) with the amino acid combination PAV identifying the taster variant (and AVI identifying the non-taster variant). [provided by RefSeq, Oct 2009]

MGAM (HGNC:7043): (maltase-glucoamylase) This gene encodes maltase-glucoamylase, which is a brush border membrane enzyme that plays a role in the final steps of digestion of starch. The protein has two catalytic sites identical to those of sucrase-isomaltase, but the proteins are only 59% homologous. Both are members of glycosyl hydrolase family 31, which has a variety of substrate specificities. [provided by RefSeq, Jul 2008]

MGAM Gene-Disease associations (from GenCC):

• Tourette syndrome

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.891

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_176817.5. 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
	TAS2R38	NM_176817.5	MANE Select	c.785C>A	p.Ala262Asp	missense	Exon 1 of 1	NP_789787.5	P59533

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TAS2R38	ENST00000547270.1	TSL:6 MANE Select	c.785C>A	p.Ala262Asp	missense	Exon 1 of 1	ENSP00000448219.1	P59533
	MGAM	ENST00000465654.5	TSL:3	c.-3+26908G>T		intron	N/A	ENSP00000419372.1	E7EW87

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 72

GnomAD4 genome Cov.: 30

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.67
BayesDel_addAF	Benign	-0.029	T
BayesDel_noAF	Benign	-0.28
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Benign	0.053	T
Eigen	Benign	-0.039
Eigen_PC	Benign	-0.27
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.031	D
MetaRNN	Pathogenic	0.89	D
MetaSVM	Benign	-0.94	T
MutationAssessor	Uncertain	2.8	M
PhyloP100		1.2
PrimateAI	Benign	0.33	T
PROVEAN	Uncertain	-3.6	D
REVEL	Benign	0.20
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.012	D
Polyphen		0.99	D
Vest4		0.66
MutPred		0.78		Gain of sheet (P = 0.0221)
MVP		0.49
MPC		0.93
ClinPred		0.94	D
GERP RS		2.9
Varity_R		0.46
gMVP		0.38
Mutation Taster		=90/10	polymorphism

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

Other links and lift over

dbSNP: rs1726866; hg19: chr7-141672705;