12-6867538-C-T

Position:

chr12-6867538-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The ENST00000229270.8(TPI1):c.83C>T(p.Thr28Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000149 in 1,608,488 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T28S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

TPI1
ENST00000229270.8 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.03

Variant links:

Genes affected

TPI1 (HGNC:12009): (triosephosphate isomerase 1) This gene encodes an enzyme, consisting of two identical proteins, which catalyzes the isomerization of glyceraldehydes 3-phosphate (G3P) and dihydroxy-acetone phosphate (DHAP) in glycolysis and gluconeogenesis. Mutations in this gene are associated with triosephosphate isomerase deficiency. Pseudogenes have been identified on chromosomes 1, 4, 6 and 7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2009]

TPI1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a chain Triosephosphate isomerase (size 247) in uniprot entity TPIS_HUMAN there are 7 pathogenic changes around while only 3 benign (70%) in ENST00000229270.8

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.08500615).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPI1	NM_000365.6 linkuse as main transcript	c.-29C>T		5_prime_UTR_variant	1/7	ENST00000396705.10	NP_000356.1
TPI1	NM_001159287.1 linkuse as main transcript	c.83C>T	p.Thr28Ile	missense_variant	1/7		NP_001152759.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TPI1	ENST00000229270.8 linkuse as main transcript	c.83C>T	p.Thr28Ile	missense_variant	1/7	1		ENSP00000229270		P60174-3
TPI1	ENST00000613953.4 linkuse as main transcript	c.83C>T	p.Thr28Ile	missense_variant	1/7	1		ENSP00000484435		P60174-3
TPI1	ENST00000396705.10 linkuse as main transcript	c.-29C>T		5_prime_UTR_variant	1/7	1	NM_000365.6	ENSP00000379933	P1	P60174-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000127

AC:

AN:

236626

Hom.:

AF XY:

0.0000154

AC XY:

AN XY:

129852

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000335

Gnomad FIN exome

AF:

0.0000482

Gnomad NFE exome

AF:

0.00000946

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000144

AC:

AN:

1456268

Hom.:

Cov.:

AF XY:

0.0000180

AC XY:

AN XY:

724190

show subpopulations

Gnomad4 AFR exome

AF:

0.0000601

Gnomad4 AMR exome

AF:

0.0000228

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000117

Gnomad4 FIN exome

AF:

0.000115

Gnomad4 NFE exome

AF:

0.00000631

Gnomad4 OTH exome

AF:

0.0000499

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74366

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000108

Hom.:

Bravo

AF:

0.00000378

ExAC

AF:

0.0000330

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Triosephosphate isomerase deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.45

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.29

T;T

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.38

FATHMM_MKL

Benign

0.63

LIST_S2

Benign

0.36

.;T

M_CAP

Benign

0.049

MetaRNN

Benign

0.085

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.0

N;N

MutationTaster

Benign

1.0

N;N

PROVEAN

Benign

-0.070

N;.

REVEL

Benign

0.024

Sift

Benign

0.045

D;.

Sift4G

Uncertain

0.035

D;D

Vest4

0.14

MutPred

0.28

Loss of loop (P = 0.0203);Loss of loop (P = 0.0203);

MVP

0.093

MPC

0.43

ClinPred

0.20

GERP RS

2.6

Varity_R

0.11

gMVP

0.25

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over