chr1-40089437-C-T

Position:

• chr1-40089437-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP3

The NM_000310.4(PPT1):​c.509G>A​(p.Gly170Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: PPT1 NM_000310.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.48

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_000310.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.77

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PPT1	NM_000310.4	c.509G>A	p.Gly170Glu	missense_variant	5/9	ENST00000642050.2	NP_000301.1
PPT1	NM_001363695.2	c.509G>A	p.Gly170Glu	missense_variant	5/8		NP_001350624.1
PPT1	NM_001142604.2	c.200G>A	p.Gly67Glu	missense_variant	2/6		NP_001136076.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PPT1	ENST00000642050.2	c.509G>A	p.Gly170Glu	missense_variant	5/9		NM_000310.4	ENSP00000493153.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuronal ceroid lipofuscinosis 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 24, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.40
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.27
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	D;.;.;.;.;.
Eigen	Benign	-0.077
Eigen_PC	Benign	-0.0078
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.85	.;T;T;T;T;T
M_CAP	Uncertain	0.13	D
MetaRNN	Pathogenic	0.77	D;D;D;D;D;D
MetaSVM	Uncertain	0.79	D
MutationAssessor	Benign	1.7	L;.;.;.;.;.
PrimateAI	Uncertain	0.50	T
PROVEAN	Pathogenic	-4.5	.;.;.;.;.;D
REVEL	Pathogenic	0.69
Sift	Uncertain	0.019	.;.;.;.;.;D
Sift4G	Benign	0.062	.;.;.;.;.;T
Polyphen		0.27	B;.;.;.;.;B
Vest4		0.40
MutPred		0.72		Loss of catalytic residue at G170 (P = 0.0052);.;.;Loss of catalytic residue at G170 (P = 0.0052);Loss of catalytic residue at G170 (P = 0.0052);.;
MVP		0.96
MPC		0.43
ClinPred		0.98	D
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.83
gMVP		0.65

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

Other links and lift over

dbSNP: rs1553167257; hg19: chr1-40555109;