rs62653607

Variant names:

• chr6-136846145-T-C
• rs62653607
• NM_000288.4:c.490T>C

Variant summary

Our verdict is Likely pathogenic. The variant received 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, single submitter U:2
• Conservation: PhyloP100: 7.44
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• peroxisome biogenesis disorder

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• peroxisome biogenesis disorder 9B

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• rhizomelic chondrodysplasia punctata type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Myriad Women’s Health, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• adult Refsum disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 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 rank	MANE	Protein	UniProt
PEX7	NM_000288.4	c.490T>C	p.Ser164Pro	missense_variant	Exon 5 of 10	ENST00000318471.5	NP_000279.1
PEX7	NM_001410945.1	c.376T>C	p.Ser126Pro	missense_variant	Exon 5 of 10		NP_001397874.1
PEX7	XM_047418874.1	c.490T>C	p.Ser164Pro	missense_variant	Exon 5 of 6		XP_047274830.1
PEX7	XM_006715502.3	c.339+19676T>C		intron_variant	Intron 3 of 6		XP_006715565.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PEX7	ENST00000318471.5	c.490T>C	p.Ser164Pro	missense_variant	Exon 5 of 10	1	NM_000288.4	ENSP00000315680.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 06, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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

May 10, 2017

Counsyl

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

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
DEOGEN2	Uncertain	0.49	.;T
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
PhyloP100		7.4
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
Mutation Taster		=7/93	disease causing

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

Other links and lift over

dbSNP: rs62653607; hg19: chr6-137167283;