rs121917723

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_000285.4(PEPD):c.833G>A(p.Gly278Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000026 in 1,613,062 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

PEPD
NM_000285.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 7.41

Variant links:

Genes affected

PEPD (HGNC:8840): (peptidase D) This gene encodes a member of the peptidase family. The protein forms a homodimer that hydrolyzes dipeptides or tripeptides with C-terminal proline or hydroxyproline residues. The enzyme serves an important role in the recycling of proline, and may be rate limiting for the production of collagen. Mutations in this gene result in prolidase deficiency, which is characterized by the excretion of large amount of di- and tri-peptides containing proline. Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Oct 2009]

PEPD links:

LOC124904692 (HGNC:):

LOC124904692 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.99

PP5

Variant 19-33401855-C-T is Pathogenic according to our data. Variant chr19-33401855-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 212.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PEPD	NM_000285.4 link	c.833G>A	p.Gly278Asp	missense_variant	Exon 12 of 15	ENST00000244137.12	NP_000276.2	P12955-1A0A140VJR2
PEPD	NM_001166056.2 link	c.710G>A	p.Gly237Asp	missense_variant	Exon 10 of 13		NP_001159528.1	P12955-2
PEPD	NM_001166057.2 link	c.641G>A	p.Gly214Asp	missense_variant	Exon 10 of 13		NP_001159529.1	P12955-3
LOC124904692	XR_007067229.1 link	n.-14C>T		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PEPD	ENST00000244137.12 link	c.833G>A	p.Gly278Asp	missense_variant	Exon 12 of 15	1	NM_000285.4	ENSP00000244137.5		P12955-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

GnomAD3 exomes

AF:

0.0000444

AC:

AN:

247862

Hom.:

AF XY:

0.0000445

AC XY:

AN XY:

134940

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000466

Gnomad NFE exome

AF:

0.0000892

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000267

AC:

AN:

1460836

Hom.:

Cov.:

AF XY:

0.0000248

AC XY:

AN XY:

726706

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000381

Gnomad4 NFE exome

AF:

0.0000297

Gnomad4 OTH exome

AF:

0.0000663

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000850

Hom.:

Bravo

AF:

0.00000756

ExAC

AF:

0.0000496

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Prolidase deficiency

Pathogenic:3

May 14, 2019

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has been previously reported as a compound heterozygous change in patients with prolidase deficiency (PMID: 8900231, 17142620), one of whom was reported to be asymptomatic (PMID: 8900231). An in vitro experiment in COS-1 cells demonstrated that this variant reduces prolidase activity to undetectable levels (PMID: 8900231). It is present in the heterozygous state in the gnomAD population database at a frequency of 0.004% (9/245214) and thus is presumed to be rare. The c.833G>A (p.Gly278Asp) variant affects a highly conserved amino acid and is predicted by multiple in silico tools to have a deleterious effect on protein function. Based on the available evidence, the c.833G>A (p.Gly278Asp) variant is classified as Likely Pathogenic. -

Nov 26, 2024

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

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PEPD c.833G>A (p.Gly278Asp) results in a non-conservative amino acid change located in the Metallopeptidase family M24 (IPR000994) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4.4e-05 in 247862 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in PEPD causing Prolidase Deficiency, allowing no conclusion about variant significance. c.833G>A has been reported in the literature in compound heterozygous individuals affected with Prolidase Deficiency (Ledoux_1996, Lupi_2006). These data indicate that the variant may be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in total loss of prolidase activity (Ledoux_1996). The following publications have been ascertained in the context of this evaluation (PMID: 8900231, 17142620). ClinVar contains an entry for this variant (Variation ID: 212). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Nov 01, 1996

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

not provided

Pathogenic:1

Nov 30, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 278 of the PEPD protein (p.Gly278Asp). This variant is present in population databases (rs121917723, gnomAD 0.007%). This missense change has been observed in individual(s) with prolidase deficiency (PMID: 8900231, 17142620). 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: 212). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt PEPD protein function with a positive predictive value of 80%. Experimental studies have shown that this missense change affects PEPD function (PMID: 8900231). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.33

BayesDel_noAF

Pathogenic

0.42

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.70

D;.;.;D

Eigen

Pathogenic

1.1

Eigen_PC

Pathogenic

0.93

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

1.0

D;D;D;.

M_CAP

Uncertain

0.26

MetaRNN

Pathogenic

0.99

D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

4.8

H;.;.;.

PrimateAI

Pathogenic

0.84

PROVEAN

Pathogenic

-6.5

D;D;D;.

REVEL

Pathogenic

0.91

Sift

Uncertain

0.0010

D;D;D;.

Sift4G

Pathogenic

0.0010

D;D;D;.

Polyphen

1.0

D;.;.;.

Vest4

0.99

MutPred

0.98

Loss of catalytic residue at D276 (P = 0.1256);.;.;.;

MVP

0.96

MPC

0.61

ClinPred

0.99

GERP RS

5.4

Varity_R

0.99

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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