Genetic Variant PPT1:p.Arg179Ser (chr1-40089411-G-T) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1PM2

The NM_000310.4(PPT1):c.535C>A(p.Arg179Ser) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000685 in 1,460,420 control chromosomes in the GnomAD database, with no homozygous occurrence. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R179C) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

PPT1
NM_000310.4 missense, splice_region

Scores

Splicing: ADA: 0.0002399

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.99

Publications

5 publications found

Variant links:

Genes affected

PPT1 (HGNC:9325): (palmitoyl-protein thioesterase 1) The protein encoded by this gene is a small glycoprotein involved in the catabolism of lipid-modified proteins during lysosomal degradation. The encoded enzyme removes thioester-linked fatty acyl groups such as palmitate from cysteine residues. Defects in this gene are a cause of infantile neuronal ceroid lipofuscinosis 1 (CLN1, or INCL) and neuronal ceroid lipofuscinosis 4 (CLN4). Two transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Dec 2008]

PPT1 Gene-Disease associations (from GenCC):

neuronal ceroid lipofuscinosis
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
neuronal ceroid lipofuscinosis 1
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen, G2P, Orphanet, Myriad Women’s Health

PPT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM1

In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_000310.4

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
PPT1	NM_000310.4 link	c.535C>A	p.Arg179Ser	missense_variant, splice_region_variant	Exon 5 of 9	ENST00000642050.2	NP_000301.1
PPT1	NM_001363695.2 link	c.535C>A	p.Arg179Ser	missense_variant, splice_region_variant	Exon 5 of 8		NP_001350624.1
PPT1	NM_001142604.2 link	c.226C>A	p.Arg76Ser	missense_variant, splice_region_variant	Exon 2 of 6		NP_001136076.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPT1	ENST00000642050.2 link	c.535C>A	p.Arg179Ser	missense_variant, splice_region_variant	Exon 5 of 9		NM_000310.4	ENSP00000493153.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251414

AF XY:

0.00000736

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460420

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726630

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33442

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86232

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

9.00e-7

AC:

AN:

1110680

Other (OTH)

AF:

0.00

AC:

AN:

60344

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.21

BayesDel_addAF

Pathogenic

0.17

BayesDel_noAF

Uncertain

0.0

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Uncertain

0.61

D;.;.;.;.;.

Eigen

Benign

-0.31

Eigen_PC

Benign

-0.15

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.0

.;D;D;D;D;D

M_CAP

Benign

0.055

MetaRNN

Uncertain

0.48

T;T;T;T;T;T

MetaSVM

Uncertain

0.013

MutationAssessor

Benign

1.3

L;.;.;.;.;.

PhyloP100

5.0

PrimateAI

Benign

0.29

PROVEAN

Benign

0.0

.;.;.;.;.;N

REVEL

Benign

0.0

Sift

Pathogenic

0.0

.;.;.;.;.;T

Sift4G

Pathogenic

0.0

.;.;.;.;.;T

Vest4

0.0

ClinPred

0.28

GERP RS

2.9

Varity_R

0.25

gMVP

0.39

Mutation Taster

=80/20

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.00024

dbscSNV1_RF

Benign

0.14

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over