NM_022445.4:c.148A>C

Variant names:

• chr7-144682946-T-G
• rs387906935
• NM_022445.4:c.148A>C

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PS1_Moderate PM1 PM2 PP3_Strong PP5

The NM_022445.4(TPK1):​c.148A>C​(p.Asn50His) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in UniProt.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TPK1 NM_022445.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 4.04

Genes affected

TPK1 (HGNC:17358): (thiamin pyrophosphokinase 1) The protein encoded by this gene functions as a homodimer and catalyzes the conversion of thiamine to thiamine pyrophosphate, a cofactor for some enzymes of the glycolytic and energy production pathways. Defects in this gene are a cause of thiamine metabolism dysfunction syndrome-5. [provided by RefSeq, Apr 2017]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PS1: Transcript NM_022445.4 (TPK1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a chain Thiamin pyrophosphokinase 1 (size 242) in uniprot entity TPK1_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_022445.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.972
• PP5: Variant 7-144682946-T-G is Pathogenic according to our data. Variant chr7-144682946-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 30568.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPK1	NM_022445.4	c.148A>C	p.Asn50His	missense_variant	Exon 4 of 9	ENST00000360057.7	NP_071890.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPK1	ENST00000360057.7	c.148A>C	p.Asn50His	missense_variant	Exon 4 of 9	1	NM_022445.4	ENSP00000353165.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Childhood encephalopathy due to thiamine pyrophosphokinase deficiency Pathogenic:1

Dec 09, 2011

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.82
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;.;D
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Uncertain	0.64	D
MutationAssessor	Pathogenic	3.2	M;.;.
PrimateAI	Benign	0.47	T
PROVEAN	Uncertain	-3.1	D;D;D
REVEL	Pathogenic	0.71
Sift	Uncertain	0.0020	D;D;D
Sift4G	Uncertain	0.028	D;D;.
Polyphen		1.0	D;D;.
Vest4		0.80
MutPred		0.93		Gain of disorder (P = 0.0849);Gain of disorder (P = 0.0849);Gain of disorder (P = 0.0849);
MVP		0.84
MPC		0.67
ClinPred		0.99	D
GERP RS		6.0
Varity_R		0.93
gMVP		0.85

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: rs387906935; hg19: chr7-144380039;