chr17-81934354-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PP3_ModeratePP5

The NM_006907.4(PYCR1):c.769G>A(p.Ala257Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000384 in 1,612,774 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 Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

PYCR1
NM_006907.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:4U:1O:1

Conservation

PhyloP100: 6.00

Variant links:

Genes affected

PYCR1 (HGNC:9721): (pyrroline-5-carboxylate reductase 1) This gene encodes an enzyme that catalyzes the NAD(P)H-dependent conversion of pyrroline-5-carboxylate to proline. This enzyme may also play a physiologic role in the generation of NADP(+) in some cell types. The protein forms a homopolymer and localizes to the mitochondrion. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

PYCR1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM1

In a helix (size 21) in uniprot entity P5CR1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_006907.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.858

PP5

Variant 17-81934354-C-T is Pathogenic according to our data. Variant chr17-81934354-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 29863.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=2, not_provided=1}. Variant chr17-81934354-C-T is described in Lovd as [Likely_pathogenic]. Variant chr17-81934354-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PYCR1	NM_006907.4 link	c.769G>A	p.Ala257Thr	missense_variant	Exon 6 of 7	ENST00000329875.13	NP_008838.2	P32322-1A0A024R8U9Q8TBX0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PYCR1	ENST00000329875.13 link	c.769G>A	p.Ala257Thr	missense_variant	Exon 6 of 7	1	NM_006907.4	ENSP00000328858.8		P32322-1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152230

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:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.0000242

AC:

AN:

248344

Hom.:

AF XY:

0.0000223

AC XY:

AN XY:

134826

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000546

Gnomad SAS exome

AF:

0.0000328

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000358

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000356

AC:

AN:

1460544

Hom.:

Cov.:

AF XY:

0.0000317

AC XY:

AN XY:

726518

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000464

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000423

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74378

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.000479

Alfa

AF:

0.0000268

Hom.:

Bravo

AF:

0.0000416

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000413

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:4Uncertain:1Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Other:1

UniProtKB/Swiss-Prot

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

Feb 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 257 of the PYCR1 protein (p.Ala257Thr). This variant is present in population databases (rs281875318, gnomAD 0.01%). This missense change has been observed in individuals with cutis laxa (PMID: 19648921, 30450527). ClinVar contains an entry for this variant (Variation ID: 29863). 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 not expected to disrupt PYCR1 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Inborn genetic diseases

Pathogenic:1

Jan 03, 2018

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

PYCR1-related de Barsy syndrome

Pathogenic:1

Sep 01, 2009

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Cutis laxa

Pathogenic:1

Feb 10, 2025

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

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PYCR1 c.769G>A (p.Ala257Thr) results in a non-conservative amino acid change located in the Pyrroline-5-carboxylate reductase dimerisation domain (IPR029036) 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 2.4e-05 in 248344 control chromosomes. c.769G>A has been reported in the literature in multiple homozygous individuals affected with Cutis Laxa - PYCR1 Related (e.g., Reversade_2009, Lessel_2018). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 30450527, 19648921). ClinVar contains an entry for this variant (Variation ID: 29863). Based on the evidence outlined above, the variant was classified as pathogenic. -

Wiedemann-Rautenstrauch-like progeroid syndrome

Pathogenic:1

University of Washington Center for Mendelian Genomics, University of Washington

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.65

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.31

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.84

D;.;.;D;.;D

Eigen

Uncertain

0.27

Eigen_PC

Benign

0.20

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.96

.;D;D;D;D;D

M_CAP

Pathogenic

0.58

MetaRNN

Pathogenic

0.86

D;D;D;D;D;D

MetaSVM

Uncertain

0.0087

MutationAssessor

Uncertain

2.9

M;M;.;M;.;.

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-3.6

D;D;.;.;D;.

REVEL

Pathogenic

0.82

Sift

Pathogenic

0.0

D;D;.;.;D;.

Sift4G

Pathogenic

0.0010

D;D;D;D;D;.

Polyphen

1.0

D;.;.;D;.;.

Vest4

0.87

MVP

0.94

MPC

0.56

ClinPred

0.95

GERP RS

3.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.90

gMVP

0.84

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