NM_000391.4(TPP1):c.1217A>G (p.Tyr406Cys) AND not provided

Germline classification:: Uncertain significance (2 submissions)
Last evaluated:: Jul 5, 2022
Review status:: 2 stars out of maximum of 4 stars
criteria provided, multiple submitters, no conflicts

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:: RCV000189785.15

Allele description [Variation Report for NM_000391.4(TPP1):c.1217A>G (p.Tyr406Cys)]

NM_000391.4(TPP1):c.1217A>G (p.Tyr406Cys)

Gene:

TPP1:tripeptidyl peptidase 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

11p15.4

Genomic location:

Preferred name:

NM_000391.4(TPP1):c.1217A>G (p.Tyr406Cys)

Other names:

p.Y406C:TAT>TGT

HGVS:

NC_000011.10:g.6615491T>C
NG_008653.1:g.8971A>G
NM_000391.4:c.1217A>GMANE SELECT
NP_000382.3:p.Tyr406Cys
LRG_830t1:c.1217A>G
LRG_830:g.8971A>G
LRG_830p1:p.Tyr406Cys
NC_000011.9:g.6636722T>C
NM_000391.3:c.1217A>G

Protein change:

Y406C

Links:

dbSNP: rs780670020

NCBI 1000 Genomes Browser:

rs780670020

Molecular consequence:

NM_000391.4:c.1217A>G - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Synonyms:: none provided
Identifiers:: MedGen: C3661900

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000243433	GeneDx	criteria provided, single submitter (GeneDx Variant Classification (06012015))	Uncertain significance (Sep 11, 2018)	germline	clinical testing	Citation Link,
SCV001518158	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Uncertain significance (Jul 5, 2022)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]

Submission Accession

Submitter

Review Status
(Assertion method)

Clinical Significance
(Last evaluated)

Origin

Method

Citations

SCV000243433

GeneDx

criteria provided, single submitter

(GeneDx Variant Classification (06012015))

Uncertain significance
(Sep 11, 2018)

germline

clinical testing

Citation Link,

SCV001518158

Labcorp Genetics (formerly Invitae), Labcorp

criteria provided, single submitter

(Invitae Variant Classification Sherloc (09022015))

Uncertain significance
(Jul 5, 2022)

germline

clinical testing

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

Help

Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	yes	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical 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 GeneDx, SCV000243433.11

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

Description

A variant of uncertain significance has been identified in the TPP1 gene. The Y406C variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The Y406C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	yes	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Labcorp Genetics (formerly Invitae), Labcorp, SCV001518158.4

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 406 of the TPP1 protein (p.Tyr406Cys). This variant is present in population databases (rs780670020, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with TPP1-related conditions. ClinVar contains an entry for this variant (Variation ID: 207589). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt TPP1 protein function. 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.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Nov 10, 2024

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