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NM_022445.4(TPK1):c.546G>C (p.Trp182Cys) AND Childhood encephalopathy due to thiamine pyrophosphokinase deficiency

Germline classification:
Uncertain significance (1 submission)
Last evaluated:
Aug 31, 2021
Review status:
1 star out of maximum of 4 stars
criteria provided, single submitter
Somatic classification
of clinical impact:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Somatic classification
of oncogenicity:
None
Review status:
(0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided
Record status:
current
Accession:
RCV001373909.6

Allele description [Variation Report for NM_022445.4(TPK1):c.546G>C (p.Trp182Cys)]

NM_022445.4(TPK1):c.546G>C (p.Trp182Cys)

Gene:
TPK1:thiamin pyrophosphokinase 1 [Gene - OMIM - HGNC]
Variant type:
single nucleotide variant
Cytogenetic location:
7q35
Genomic location:
Preferred name:
NM_022445.4(TPK1):c.546G>C (p.Trp182Cys)
HGVS:
  • NC_000007.14:g.144548558C>G
  • NG_032112.2:g.292496G>C
  • NM_001042482.2:c.399G>C
  • NM_001350879.1:c.546G>C
  • NM_001350880.1:c.399G>C
  • NM_001350881.1:c.546G>C
  • NM_001350882.1:c.531G>C
  • NM_001350883.1:c.531G>C
  • NM_001350884.2:c.531G>C
  • NM_001350885.1:c.228G>C
  • NM_001350886.1:c.228G>C
  • NM_001350887.1:c.228G>C
  • NM_001350889.1:c.228G>C
  • NM_001350893.1:c.228G>C
  • NM_001350894.1:c.228G>C
  • NM_001350895.1:c.195G>C
  • NM_022445.4:c.546G>CMANE SELECT
  • NP_001035947.1:p.Trp133Cys
  • NP_001337808.1:p.Trp182Cys
  • NP_001337809.1:p.Trp133Cys
  • NP_001337810.1:p.Trp182Cys
  • NP_001337811.1:p.Trp177Cys
  • NP_001337812.1:p.Trp177Cys
  • NP_001337813.1:p.Trp177Cys
  • NP_001337814.1:p.Trp76Cys
  • NP_001337815.1:p.Trp76Cys
  • NP_001337816.1:p.Trp76Cys
  • NP_001337818.1:p.Trp76Cys
  • NP_001337822.1:p.Trp76Cys
  • NP_001337823.1:p.Trp76Cys
  • NP_001337824.1:p.Trp65Cys
  • NP_071890.2:p.Trp182Cys
  • NC_000007.13:g.144245651C>G
  • NR_146934.1:n.443G>C
  • NR_146935.1:n.582G>C
  • NR_146936.2:n.895G>C
Protein change:
W133C
Links:
dbSNP: rs751636131
NCBI 1000 Genomes Browser:
rs751636131
Molecular consequence:
  • NM_001042482.2:c.399G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350879.1:c.546G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350880.1:c.399G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350881.1:c.546G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350882.1:c.531G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350883.1:c.531G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350884.2:c.531G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350885.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350886.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350887.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350889.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350893.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350894.1:c.228G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_001350895.1:c.195G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NM_022445.4:c.546G>C - missense variant - [Sequence Ontology: SO:0001583]
  • NR_146934.1:n.443G>C - non-coding transcript variant - [Sequence Ontology: SO:0001619]
  • NR_146935.1:n.582G>C - non-coding transcript variant - [Sequence Ontology: SO:0001619]
  • NR_146936.2:n.895G>C - non-coding transcript variant - [Sequence Ontology: SO:0001619]

Condition(s)

Name:
Childhood encephalopathy due to thiamine pyrophosphokinase deficiency
Synonyms:
ENCEPHALOPATHY, EPISODIC, DUE TO THIAMINE PYROPHOSPHOKINASE DEFICIENCY; Thiamine metabolism dysfunction syndrome 5 (episodic encephalopathy type)
Identifiers:
MONDO: MONDO:0013761; MedGen: C3280866; Orphanet: 293955; OMIM: 614458

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Assertion and evidence details

Help
Submission AccessionSubmitterReview Status
(Assertion method)		Clinical Significance
(Last evaluated)		OriginMethodCitations
SCV001570648Labcorp Genetics (formerly Invitae), Labcorp
criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))		Uncertain significance
(Aug 31, 2021) 		germlineclinical testing

PubMed (1)
[See all records that cite this PMID]

Help

Summary from all submissions

EthnicityOriginAffectedIndividualsFamiliesChromosomes testedNumber TestedFamily historyMethod
not providedgermlineunknownnot providednot providednot providednot providednot providedclinical testing

Citations

PubMed

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group, Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]
PMID:
28492532
PMCID:
PMC5632818

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001570648.3

#EthnicityIndividualsChromosomes TestedFamily HistoryMethodCitations
1not providednot providednot providednot providedclinical testing PubMed (1)

Description

This sequence change replaces tryptophan with cysteine at codon 182 of the TPK1 protein (p.Trp182Cys). The tryptophan residue is moderately conserved and there is a large physicochemical difference between tryptophan and cysteine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with TPK1-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

#SampleMethodObservation
OriginAffectedNumber testedTissuePurposeMethodIndividualsAllele frequencyFamiliesCo-occurrences
1germlineunknownnot providednot providednot providednot providednot providednot providednot provided

Last Updated: Sep 29, 2024