rs78970155

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 4P and 20B. PM1PM5BP4_StrongBP6_Very_StrongBS1BS2

The NM_000391.4(TPP1):c.1396G>A(p.Val466Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00059 in 1,614,178 control chromosomes in the GnomAD database, including 7 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V466G) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.0031 ( 4 hom., cov: 32)

Exomes 𝑓: 0.00032 ( 3 hom. )

Consequence

TPP1
NM_000391.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 0.253

Publications

3 publications found

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 Gene-Disease associations (from GenCC):

neuronal ceroid lipofuscinosis
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
neuronal ceroid lipofuscinosis 2
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Myriad Women’s Health, G2P, Orphanet
autosomal recessive spinocerebellar ataxia 7
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

TPP1 links:

ENSG00000285338 (HGNC:):

ENSG00000285338 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -16 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 6 uncertain in NM_000391.4

PM5

Other missense variant is known to change same aminoacid residue: Variant chr11-6615199-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 89086.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP4

Computational evidence support a benign effect (MetaRNN=0.00558722).

BP6

Variant 11-6615200-C-T is Benign according to our data. Variant chr11-6615200-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 137704.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00315 (479/152284) while in subpopulation AFR AF = 0.0108 (450/41548). AF 95% confidence interval is 0.01. There are 4 homozygotes in GnomAd4. There are 215 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 4 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPP1	NM_000391.4 link	c.1396G>A	p.Val466Met	missense_variant	Exon 11 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.1396G>A	p.Val466Met	missense_variant	Exon 11 of 13	1	NM_000391.4	ENSP00000299427.6		O14773-1

Frequencies

GnomAD3 genomes

AF:

0.00312

AC:

475

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0108

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00144

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:

0.0000441

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000787

AC:

198

AN:

251490

AF XY:

0.000567

show subpopulations

Gnomad AFR exome

AF:

0.0108

Gnomad AMR exome

AF:

0.000636

Gnomad ASJ exome

AF:

0.00

Gnomad EAS 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:

0.000324

AC:

474

AN:

1461894

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

205

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.0119

AC:

399

AN:

33480

American (AMR)

AF:

0.000626

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000360

AC:

AN:

1112012

Other (OTH)

AF:

0.000662

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

107

143

179

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00315

AC:

479

AN:

152284

Hom.:

Cov.:

AF XY:

0.00289

AC XY:

215

AN XY:

74458

show subpopulations

African (AFR)

AF:

0.0108

AC:

450

AN:

41548

American (AMR)

AF:

0.00144

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68024

Other (OTH)

AF:

0.00189

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

124

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00116

Hom.:

Bravo

AF:

0.00339

ESP6500AA

AF:

0.0109

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000980

AC:

119

Asia WGS

AF:

0.000577

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Jan 27, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

not specified

Benign:1

Jul 30, 2013

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Inborn genetic diseases

Benign:1

Mar 21, 2016

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Neuronal ceroid lipofuscinosis 2

Benign:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.41

CADD

Benign

(source)

DANN

Benign

0.94

DEOGEN2

Benign

0.34

T;.;.;.;.;.;.

Eigen

Benign

-0.90

Eigen_PC

Benign

-0.92

FATHMM_MKL

Benign

0.072

LIST_S2

Benign

0.78

T;.;T;.;T;.;T

MetaRNN

Benign

0.0056

T;T;T;T;T;T;T

MetaSVM

Benign

-0.74

MutationAssessor

Uncertain

2.4

M;.;.;.;.;.;.

PhyloP100

0.25

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.96

N;N;.;.;.;.;.

REVEL

Benign

0.088

Sift

Benign

0.051

T;T;.;.;.;.;.

Sift4G

Benign

0.11

T;T;.;.;.;.;.

Polyphen

0.11

B;.;.;.;.;.;.

Vest4

0.33

MVP

0.63

MPC

0.21

ClinPred

0.0093

GERP RS

-1.7

Varity_R

0.063

gMVP

0.61

Mutation Taster

=75/25

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over