rs763162812

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The NM_000391.4(TPP1):c.827A>T(p.Asp276Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000682 in 1,613,862 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 31)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

TPP1
NM_000391.4 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:8

Conservation

PhyloP100: 7.54

Variant links:

Genes affected

TPP1 (HGNC:2073): (tripeptidyl peptidase 1) This gene encodes a member of the sedolisin family of serine proteases. The protease functions in the lysosome to cleave N-terminal tripeptides from substrates, and has weaker endopeptidase activity. It is synthesized as a catalytically-inactive enzyme which is activated and auto-proteolyzed upon acidification. Mutations in this gene result in late-infantile neuronal ceroid lipofuscinosis, which is associated with the failure to degrade specific neuropeptides and a subunit of ATP synthase in the lysosome. [provided by RefSeq, Jul 2008]

TPP1 links:

ENSG00000285338 (HGNC:):

ENSG00000285338 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a helix (size 12) in uniprot entity TPP1_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_000391.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.991

PP5

Variant 11-6616720-T-A is Pathogenic according to our data. Variant chr11-6616720-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 207581.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-6616720-T-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPP1	NM_000391.4 link	c.827A>T	p.Asp276Val	missense_variant	Exon 7 of 13	ENST00000299427.12	NP_000382.3	O14773-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPP1	ENST00000299427.12 link	c.827A>T	p.Asp276Val	missense_variant	Exon 7 of 13	1	NM_000391.4	ENSP00000299427.6		O14773-1

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

151890

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000294

Gnomad OTH

AF:

0.000481

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251454

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135904

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461854

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152008

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.000476

Alfa

AF:

0.0000843

Hom.:

Bravo

AF:

0.0000340

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Neuronal ceroid lipofuscinosis 2

Pathogenic:4

May 20, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The observed missense c.827A>T(p.Asp276Val) variant in TPP1 gene has been reported previously in multiple individuals affected with neuronal ceroid lipofuscinosis type 2 (Kohan R, et al., 2015; Kohan R, et al., 2013; Kohan R, et al., 2009). Experimental studies indicate that this variant impacts the catalytic machinery of TPP1 gene (Walus M, et al., 2005). The p.Asp276Val variant has been reported with allele frequency of 0.002% in gnomAD Exomes. This variant has been reported to the ClinVar database as Pathogenic (multiple submissions). Multiple lines of computational evidences (Polyphen - Probably damaging, SIFT - Damaging and MutationTaster - Disease causing) predict a damaging effect on protein structure and function for this variant. The reference amino acid is predicted as conserved by GERP++ and PhyloP across 100 vertebrates. The amino acid Asp at position 276 is changed to a Val changing protein sequence and it might alter its composition and physico-chemical properties. For these reasons, this variant has been classified as Pathogenic. -

Jan 20, 2020

Unidad de Genómica Garrahan, Hospital de Pediatría Garrahan

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 02, 2017

Counsyl

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided

Pathogenic:3

May 12, 2023

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 31589614, 32488064, 33084218, 28792770, 25976102, 29655203, 19793312, 31440721, 23266810, 33377563, 31283065) -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid, which is acidic and polar, with valine, which is neutral and non-polar, at codon 276 of the TPP1 protein (p.Asp276Val). This variant is present in population databases (rs763162812, gnomAD 0.01%). This missense change has been observed in individual(s) with neuronal ceroid lipofuscinosis type 2 (PMID: 19793312, 22832778, 23266810, 25976102). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 207581). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt TPP1 protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

Dec 23, 2022

Revvity Omics, Revvity

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Autosomal recessive spinocerebellar ataxia 7;C1876161:Neuronal ceroid lipofuscinosis 2

Pathogenic:1

May 08, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.43

BayesDel_noAF

Pathogenic

0.60

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.91

D;.;.;.;.;.;.

Eigen

Pathogenic

0.87

Eigen_PC

Pathogenic

0.74

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

D;.;D;.;D;.;D

M_CAP

Pathogenic

0.87

MetaRNN

Pathogenic

0.99

D;D;D;D;D;D;D

MetaSVM

Pathogenic

0.99

MutationAssessor

Pathogenic

4.6

H;.;.;.;.;.;.

PrimateAI

Uncertain

0.74

PROVEAN

Pathogenic

-8.1

D;D;.;.;.;.;.

REVEL

Pathogenic

0.99

Sift

Pathogenic

0.0

D;D;.;.;.;.;.

Sift4G

Pathogenic

0.0010

D;D;.;.;.;.;.

Polyphen

1.0

D;.;.;.;.;.;.

Vest4

0.97

MutPred

0.94

Gain of sheet (P = 0.0101);.;.;.;Gain of sheet (P = 0.0101);.;.;

MVP

0.99

MPC

0.91

ClinPred

1.0

GERP RS

4.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.95

gMVP

0.97

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