Genetic Variant TKT:c.*3C>T (chr3-53225753-G-A) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_001064.4(TKT):c.*3C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000223 in 1,607,250 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00023 ( 0 hom. )

Consequence

TKT
NM_001064.4 3_prime_UTR

Scores

Splicing: ADA: 0.01796

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -2.87

Publications

1 publications found

Variant links:

Genes affected

TKT (HGNC:11834): (transketolase) This gene encodes a thiamine-dependent enzyme which plays a role in the channeling of excess sugar phosphates to glycolysis in the pentose phosphate pathway. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Apr 2012]

TKT Gene-Disease associations (from GenCC):

transketolase deficiency
Inheritance: AR Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)

TKT links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.81).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TKT	NM_001064.4 link	c.*3C>T		3_prime_UTR_variant	Exon 14 of 14	ENST00000462138.6	NP_001055.1	P29401-1V9HWD9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TKT	ENST00000462138.6 link	c.*3C>T		3_prime_UTR_variant	Exon 14 of 14	1	NM_001064.4	ENSP00000417773.1		P29401-1

Frequencies

GnomAD3 genomes

AF:

0.000164

AC:

AN:

152020

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000864

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000250

Gnomad OTH

AF:

0.000480

GnomAD2 exomes

AF:

0.000267

AC:

AN:

246776

AF XY:

0.000300

show subpopulations

Gnomad AFR exome

AF:

0.000124

Gnomad AMR exome

AF:

0.000325

Gnomad ASJ exome

AF:

0.000815

Gnomad EAS exome

AF:

0.0000548

Gnomad FIN exome

AF:

0.000234

Gnomad NFE exome

AF:

0.000313

Gnomad OTH exome

AF:

0.000502

GnomAD4 exome

AF:

0.000229

AC:

333

AN:

1455230

Hom.:

Cov.:

AF XY:

0.000243

AC XY:

176

AN XY:

723484

show subpopulations

African (AFR)

AF:

0.0000599

AC:

AN:

33380

American (AMR)

AF:

0.000338

AC:

AN:

44380

Ashkenazi Jewish (ASJ)

AF:

0.00112

AC:

AN:

25804

East Asian (EAS)

AF:

0.0000507

AC:

AN:

39480

South Asian (SAS)

AF:

0.0000235

AC:

AN:

85256

European-Finnish (FIN)

AF:

0.000150

AC:

AN:

53212

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5734

European-Non Finnish (NFE)

AF:

0.000234

AC:

259

AN:

1107932

Other (OTH)

AF:

0.000250

AC:

AN:

60052

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.473

Heterozygous variant carriers

102

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000164

AC:

AN:

152020

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74252

show subpopulations

African (AFR)

AF:

0.0000966

AC:

AN:

41396

American (AMR)

AF:

0.00

AC:

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.000864

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10560

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000250

AC:

AN:

68004

Other (OTH)

AF:

0.000480

AC:

AN:

2082

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.531

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000215

Hom.:

Bravo

AF:

0.000181

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Transketolase deficiency

Uncertain:1

Nov 14, 2022

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.81

CADD

Benign

(source)

DANN

Benign

0.64

PhyloP100

-2.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.018

dbscSNV1_RF

Benign

0.22

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.99

Position offset: 2

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

Publications

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3-53225753-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over