7-144582548-C-T

Variant names:

• chr7-144582548-C-T
• rs17170147
• NM_022445.4:c.501+8875G>A

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_022445.4(TPK1):​c.501+8875G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0909 in 152,098 control chromosomes in the GnomAD database, including 1,000 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 0.091 (1000 hom., cov: 32)
• Consequence: TPK1 NM_022445.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.646
• Publications: 1 publications found

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]

TPK1 Gene-Disease associations (from GenCC):

• childhood encephalopathy due to thiamine pyrophosphokinase deficiency

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.192 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022445.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPK1	NM_022445.4	MANE Select	c.501+8875G>A		intron	N/A	NP_071890.2
	TPK1	NM_001350879.1		c.501+8875G>A		intron	N/A	NP_001337808.1
	TPK1	NM_001350881.1		c.501+8875G>A		intron	N/A	NP_001337810.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TPK1	ENST00000360057.7	TSL:1 MANE Select	c.501+8875G>A		intron	N/A	ENSP00000353165.3
	TPK1	ENST00000378098.8	TSL:1	n.*257+8875G>A		intron	N/A	ENSP00000367338.4
	TPK1	ENST00000482940.5	TSL:1	n.*426+8875G>A		intron	N/A	ENSP00000449909.1

Frequencies

GnomAD3 genomes AF: 0.0908 AC: 13798 AN: 151980 Hom.: 992 Cov.: 32

Gnomad AFR AF: 0.195

Gnomad AMI AF: 0.00877

Gnomad AMR AF: 0.0611

Gnomad ASJ AF: 0.114

Gnomad EAS AF: 0.00193

Gnomad SAS AF: 0.0421

Gnomad FIN AF: 0.0412

Gnomad MID AF: 0.162

Gnomad NFE AF: 0.0514

Gnomad OTH AF: 0.0987

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

GnomAD4 genome AF: 0.0909 AC: 13828 AN: 152098 Hom.: 1000 Cov.: 32 AF XY: 0.0882 AC XY: 6562 AN XY: 74394

African (AFR) AF: 0.195 AC: 8097 AN: 41458

American (AMR) AF: 0.0609 AC: 929 AN: 15260

Ashkenazi Jewish (ASJ) AF: 0.114 AC: 397 AN: 3470

East Asian (EAS) AF: 0.00193 AC: 10 AN: 5180

South Asian (SAS) AF: 0.0419 AC: 202 AN: 4820

European-Finnish (FIN) AF: 0.0412 AC: 437 AN: 10614

Middle Eastern (MID) AF: 0.158 AC: 46 AN: 292

European-Non Finnish (NFE) AF: 0.0514 AC: 3493 AN: 67982

Other (OTH) AF: 0.0991 AC: 209 AN: 2110

Alfa AF: 0.0667 Hom.: 116

Bravo AF: 0.0983

Asia WGS AF: 0.0440 AC: 152 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	6.6
DANN	Benign	0.81
PhyloP100		0.65
Mutation Taster		=100/0	polymorphism (auto)

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: rs17170147; hg19: chr7-144279641;