rs62653607

chr6-136846145-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_000288.4(PEX7):c.490T>C(p.Ser164Pro) variant causes a missense change involving the alteration of a 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 (★★). Synonymous variant affecting the same amino acid position (i.e. S164S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PEX7 NM_000288.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.44

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.985

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PEX7	NM_000288.4	c.490T>C	p.Ser164Pro	missense_variant	5/10	ENST00000318471.5
PEX7	NM_001410945.1	c.376T>C	p.Ser126Pro	missense_variant	5/10
PEX7	XM_047418874.1	c.490T>C	p.Ser164Pro	missense_variant	5/6
PEX7	XM_006715502.3	c.339+19676T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PEX7	ENST00000318471.5	c.490T>C	p.Ser164Pro	missense_variant	5/10	1	NM_000288.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Sep 06, 2023

Variant summary: PEX7 c.490T>C (p.Ser164Pro) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 251256 control chromosomes. c.490T>C has been reported in the literature in individuals affected with Rhizomelic Chondrodysplasia Punctata Type 1 (Braverman_2002). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 12325024). One submitter has cited clinical-significance assessments for this variant to ClinVar after 2014 and has classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Rhizomelic chondrodysplasia punctata type 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

May 10, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.30
Cadd	Pathogenic	30
Dann	Uncertain	1.0
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Uncertain	0.15	D
MutationAssessor	Pathogenic	3.4	M;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-4.4	D;D
REVEL	Pathogenic	0.76
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.034	D;D
Polyphen		1.0	.;D
Vest4		0.97
MutPred		0.95		Loss of sheet (P = 0.1501);Loss of sheet (P = 0.1501);
MVP		0.97
MPC		0.64
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.78
gMVP		0.70

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: rs62653607; hg19: chr6-137167283;