6-18145676-C-T

Position:

• chr6-18145676-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The ENST00000309983.5(TPMT):​c.234-1948G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0576 in 152,250 control chromosomes in the GnomAD database, including 335 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.058 (335 hom., cov: 32)
• Consequence: TPMT ENST00000309983.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.147

Genes affected

TPMT (HGNC:12014): (thiopurine S-methyltransferase) This gene encodes the enzyme that metabolizes thiopurine drugs via S-adenosyl-L-methionine as the S-methyl donor and S-adenosyl-L-homocysteine as a byproduct. Thiopurine drugs such as 6-mercaptopurine are used as chemotherapeutic agents. Genetic polymorphisms that affect this enzymatic activity are correlated with variations in sensitivity and toxicity to such drugs within individuals, causing thiopurine S-methyltransferase deficiency. Related pseudogenes have been identified on chromosomes 3, 18 and X. [provided by RefSeq, Aug 2014]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.99).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.102 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPMT	NM_000367.5	c.234-1948G>A		intron_variant		ENST00000309983.5	NP_000358.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TPMT	ENST00000309983.5	c.234-1948G>A		intron_variant		1	NM_000367.5	ENSP00000312304	P1

Frequencies

GnomAD3 genomes AF: 0.0575 AC: 8752 AN: 152132 Hom.: 336 Cov.: 32

Gnomad AFR AF: 0.105

Gnomad AMI AF: 0.0164

Gnomad AMR AF: 0.0545

Gnomad ASJ AF: 0.0196

Gnomad EAS AF: 0.0150

Gnomad SAS AF: 0.0184

Gnomad FIN AF: 0.0295

Gnomad MID AF: 0.0285

Gnomad NFE AF: 0.0428

Gnomad OTH AF: 0.0488

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0576 AC: 8767 AN: 152250 Hom.: 335 Cov.: 32 AF XY: 0.0559 AC XY: 4164 AN XY: 74442

Gnomad4 AFR AF: 0.105

Gnomad4 AMR AF: 0.0544

Gnomad4 ASJ AF: 0.0196

Gnomad4 EAS AF: 0.0151

Gnomad4 SAS AF: 0.0186

Gnomad4 FIN AF: 0.0295

Gnomad4 NFE AF: 0.0428

Gnomad4 OTH AF: 0.0482

Alfa AF: 0.0525 Hom.: 81

Bravo AF: 0.0623

Asia WGS AF: 0.0230 AC: 80 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.99
CADD	Benign	0.13
DANN	Benign	0.43

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

LitVar

Other links and lift over

dbSNP: rs11964408; hg19: chr6-18145907;