rs141482368

Positions:

chr11-6616357-T-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000391.4(TPP1):c.1033A>C(p.Met345Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000843 in 1,613,344 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00049 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00088 ( 20 hom. )

Consequence

TPP1
NM_000391.4 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:8

Conservation

PhyloP100: 2.48

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.010187507).

BP6

Variant 11-6616357-T-G is Benign according to our data. Variant chr11-6616357-T-G is described in ClinVar as [Likely_benign]. Clinvar id is 305509.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-6616357-T-G is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population sas. gnomad4 allele frequency = 0.000492 (75/152292) while in subpopulation SAS AF= 0.0132 (64/4832). AF 95% confidence interval is 0.0106. There are 1 homozygotes in gnomad4. There are 55 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

BS2

High Homozygotes in GnomAdExome4 at 20 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TPP1	NM_000391.4 linkuse as main transcript	c.1033A>C	p.Met345Leu	missense_variant	8/13	ENST00000299427.12	NP_000382.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TPP1	ENST00000299427.12 linkuse as main transcript	c.1033A>C	p.Met345Leu	missense_variant	8/13	1	NM_000391.4	ENSP00000299427	P1	O14773-1

Frequencies

GnomAD3 genomes

AF:

0.000499

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.0134

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.000956

GnomAD3 exomes

AF:

0.00162

AC:

408

AN:

251448

Hom.:

AF XY:

0.00215

AC XY:

292

AN XY:

135896

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0126

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000141

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000880

AC:

1285

AN:

1461052

Hom.:

Cov.:

AF XY:

0.00128

AC XY:

930

AN XY:

726856

show subpopulations

Gnomad4 AFR exome

AF:

0.000120

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0132

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000639

Gnomad4 OTH exome

AF:

0.00108

GnomAD4 genome

AF:

0.000492

AC:

AN:

152292

Hom.:

Cov.:

AF XY:

0.000738

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.0000722

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.0132

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.000946

Alfa

AF:

0.000153

Hom.:

Bravo

AF:

0.000151

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00180

AC:

218

Asia WGS

AF:

0.00606

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000237

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:3

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	May 23, 2018	This variant is associated with the following publications: (PMID: 30541466) -
Benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2022	TPP1: BS1, BS2 -

Neuronal ceroid lipofuscinosis 2

Benign:3

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Likely benign, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	May 18, 2021	- -
Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 10, 2020	- -

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Mar 08, 2022

Variant summary: TPP1 c.1033A>C (p.Met345Leu) results in a conservative amino acid change located in the Peptidase S8/S53 domain (IPR000209) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0016 in 251448 control chromosomes, predominantly at a frequency of 0.013 within the South Asian subpopulation in the gnomAD database, including 4 homozygotes. The observed variant frequency within South Asian control individuals in the gnomAD database is approximately 7 fold of the estimated maximal expected allele frequency for a pathogenic variant in TPP1 causing Neuronal Ceroid-Lipofuscinosis (Batten Disease) phenotype (0.002), strongly suggesting that the variant is a benign polymorphism found primarily in populations of South Asian origin. c.1033A>C has been reported in the literature in a heterozygous individual (non-informative genotype) reportedly affected with Neuronal Ceroid-Lipofuscinosis without evidence for causality (Sheth_2018). This report does not provide unequivocal conclusions about association of the variant with Neuronal Ceroid-Lipofuscinosis (Batten Disease). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign (n=3) and likely benign (n=2). Based on the evidence outlined above, the variant was classified as likely benign. -

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

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 08, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.33

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.16

CADD

Benign

DANN

Benign

0.94

DEOGEN2

Uncertain

0.46

T;.;.;.;.;.

Eigen

Benign

0.037

Eigen_PC

Benign

0.079

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.79

T;.;T;.;.;T

MetaRNN

Benign

0.010

T;T;T;T;T;T

MetaSVM

Uncertain

0.025

MutationAssessor

Benign

1.7

L;.;.;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.54

PROVEAN

Benign

-1.8

N;N;.;.;.;.

REVEL

Uncertain

0.43

Sift

Uncertain

0.022

D;T;.;.;.;.

Sift4G

Benign

0.48

T;T;.;.;.;.

Polyphen

0.69

P;.;.;.;.;.

Vest4

0.36

MutPred

0.52

Loss of MoRF binding (P = 0.0841);.;.;.;.;.;

MVP

0.90

MPC

0.22

ClinPred

0.042

GERP RS

4.4

Varity_R

0.35

gMVP

0.82

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