rs121909152

Positions:

chr6-136869905-G-A

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1PM2PP3_StrongPP5_Very_Strong

The NM_000288.4(PEX7):c.649G>A(p.Gly217Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000787 in 1,613,458 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 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000081 ( 0 hom. )

Consequence

PEX7
NM_000288.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:13O:1

Conservation

PhyloP100: 7.68

Variant links:

Genes affected

PEX7 (HGNC:8860): (peroxisomal biogenesis factor 7) This gene encodes the cytosolic receptor for the set of peroxisomal matrix enzymes targeted to the organelle by the peroxisome targeting signal 2 (PTS2). Defects in this gene cause peroxisome biogenesis disorders (PBDs), which are characterized by multiple defects in peroxisome function. There are at least 14 complementation groups for PBDs, with more than one phenotype being observed in cases falling into particular complementation groups. Although the clinical features of PBD patients vary, cells from all PBD patients exhibit a defect in the import of one or more classes of peroxisomal matrix proteins into the organelle. Defects in this gene have been associated with PBD complementation group 11 (PBD-CG11) disorders, rhizomelic chondrodysplasia punctata type 1 (RCDP1), and Refsum disease (RD). [provided by RefSeq, Oct 2008]

PEX7 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 16 ACMG points.

PM1

In a repeat WD 4 (size 31) in uniprot entity PEX7_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000288.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.946

PP5

Variant 6-136869905-G-A is Pathogenic according to our data. Variant chr6-136869905-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 7782.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-136869905-G-A is described in Lovd as [Pathogenic]. Variant chr6-136869905-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
PEX7	NM_000288.4 linkuse as main transcript	c.649G>A	p.Gly217Arg	missense_variant	7/10	ENST00000318471.5	NP_000279.1
PEX7	NM_001410945.1 linkuse as main transcript	c.535G>A	p.Gly179Arg	missense_variant	7/10		NP_001397874.1
PEX7	XM_006715502.3 linkuse as main transcript	c.355G>A	p.Gly119Arg	missense_variant	4/7		XP_006715565.1
PEX7	XM_047418874.1 linkuse as main transcript	c.526+23724G>A		intron_variant			XP_047274830.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PEX7	ENST00000318471.5 linkuse as main transcript	c.649G>A	p.Gly217Arg	missense_variant	7/10	1	NM_000288.4	ENSP00000315680	P1	O00628-1

Frequencies

GnomAD3 genomes

AF:

0.0000591

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251402

Hom.:

AF XY:

0.0000368

AC XY:

AN XY:

135870

show subpopulations

Gnomad AFR exome

AF:

0.000123

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:

0.00

Gnomad NFE exome

AF:

0.0000616

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000808

AC:

118

AN:

1461298

Hom.:

Cov.:

AF XY:

0.0000702

AC XY:

AN XY:

726974

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000999

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74336

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000995

Hom.:

Bravo

AF:

0.0000869

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:13Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Rhizomelic chondrodysplasia punctata type 1

Pathogenic:5Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Apr 01, 1997	- -
Pathogenic, criteria provided, single submitter	clinical testing	Knight Diagnostic Laboratories, Oregon Health and Sciences University	Mar 04, 2016	c.649G>A, p.Gly217Arg variant has previously been reported in trans with a known pathogenic variant, p.Leu292ter in five affected individuals (Braverman N et al., 1997) as well as in the homozygous state in one affected individual (Braverman et al. 2002). It has been shown to induce an import defect where the protein remains mainly cytosolic instead of targeting to the peroxisome (Braverman et al. 2002). In 138 affected individuals, this variant has been observed in 10 alleles (~4%) (Braverman et al. 2002; Motley AM et al., 2002); in the ExAC database, only 2 alleles with this variant has been reported (0.002%). This indicates that the prevalence of this variant is significantly higher in cases compared with controls (Odds ratio 2282; 95% CI 498 â€“ 10466). Multiple in silico algorithms predict a deleterious effect (GERP =4.98; CADD = 19.87; PolyPhen = 1; SIFT = 0). Therefore, this collective evidence supports the classification of the c.649G>A (p.Gly217Arg) as a Pathogenic variant for rhizomelic chondrodysplasia punctata type I. We have confirmed this finding in our laboratory using Sanger sequencing. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	-	- -
not provided, no classification provided	literature only	GeneReviews	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Dec 11, 2019	NM_000288.3(PEX7):c.649G>A(G217R) is classified as likely pathogenic in the context of type 1 rhizomelic chondrodysplasia punctata. Sources cited for classification include the following: PMID 11781871, 12325024, and 11756410. Classification of NM_000288.3(PEX7):c.649G>A(G217R) is based on the following criteria: This variant has been observed more frequently in patients with clinical diagnoses than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jul 24, 2018	Variant summary: PEX7 c.649G>A (p.Gly217Arg) results in a non-conservative amino acid change located in the WD40-repeat-containing domain 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 4e-05 in 277138 control chromosomes (gnomAD). c.649G>A has been reported in the literature in multiple individuals affected with Rhizomelic Chondrodysplasia Punctata Type 1 (Braverman_1997, Motley_2002). These data indicate that the variant is very likely to be associated with disease. One publication reports experimental evidence evaluating an impact on protein function, however, does not allow convincing conclusions about the variant effect (Motley_2002). Two ClinVar submissions from clinical diagnostic laboratories (evaluation after 2014) cite the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Nov 13, 2023	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 12054588, 20145307, 11781871, 15287046, 10083738, 9472033, 20301447, 9090381, 24172221, 12325024, 11756410, 23572185) -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jul 31, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jul 13, 2020	PS3, PS4, PM2, PP3 -

Peroxisome biogenesis disorder 9B

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 07, 2024	- -
Pathogenic, no assertion criteria provided	clinical testing	Knight Diagnostic Laboratories, Oregon Health and Sciences University	Mar 04, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 05, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 217 of the PEX7 protein (p.Gly217Arg). This variant is present in population databases (rs121909152, gnomAD 0.01%). This missense change has been observed in individuals with rhizomelic chondrodysplasia punctata (PMID: 9090381, 11781871, 12325024, 23572185). ClinVar contains an entry for this variant (Variation ID: 7782). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. Experimental studies have shown that this missense change affects PEX7 function (PMID: 9472033, 11756410, 12325024). For these reasons, this variant has been classified as Pathogenic. -

Inborn genetic diseases

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 17, 2021

The c.649G>A (p.G217R) alteration is located in exon 7 (coding exon 7) of the PEX7 gene. This alteration results from a G to A substitution at nucleotide position 649, causing the glycine (G) at amino acid position 217 to be replaced by an arginine (R). Based on data from gnomAD, the A allele has an overall frequency of 0.004% (11/282,804) total alleles studied. The highest observed frequency was 0.01% (3/24,972) of African alleles. This alteration has been reported compound heterozygous with a second alteration in PEX7 in multiple patients with rhizomelic chondrodysplasia punctata (RCDP) (Braverman, 1997; Braverman, 2002). Motley et al. (2002) also reported this alteration in patients with RCDP. This amino acid position is highly conserved in available vertebrate species. Functional studies showed that this alteration resulted in abnormal cellular localization and defective protein binding in Chinese hamster ovary ZPG207 mutant cells and fibroblasts from patients with RCDP (Braverman, 2002; Mukai, 2002). This alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, this alteration is classified as pathogenic. -

Rhizomelic chondrodysplasia punctata

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Natera, Inc.

Feb 25, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.22

BayesDel_noAF

Pathogenic

0.32

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.75

.;D

Eigen

Pathogenic

0.71

Eigen_PC

Uncertain

0.58

FATHMM_MKL

Uncertain

0.93

LIST_S2

Uncertain

0.95

D;D

M_CAP

Uncertain

0.16

MetaRNN

Pathogenic

0.95

D;D

MetaSVM

Uncertain

0.39

MutationAssessor

Pathogenic

3.3

M;M

MutationTaster

Benign

1.0

A;A

PrimateAI

Uncertain

0.78

PROVEAN

Pathogenic

-6.5

D;D

REVEL

Pathogenic

0.78

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.0050

D;D

Polyphen

1.0

.;D

Vest4

0.99

MutPred

0.95

Gain of MoRF binding (P = 0.054);Gain of MoRF binding (P = 0.054);

MVP

0.96

MPC

0.27

ClinPred

0.95

GERP RS

5.0

Varity_R

0.79

gMVP

0.87

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