chr7-92517968-G-A

Position:

• chr7-92517968-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000466.3(PEX1):​c.547C>T​(p.Arg183Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000343 in 1,459,500 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 (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: PEX1 NM_000466.3 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 2.25

Genes affected

PEX1 (HGNC:8850): (peroxisomal biogenesis factor 1) This gene encodes a member of the AAA ATPase family, a large group of ATPases associated with diverse cellular activities. This protein is cytoplasmic but is often anchored to a peroxisomal membrane where it forms a heteromeric complex and plays a role in the import of proteins into peroxisomes and peroxisome biogenesis. Mutations in this gene have been associated with complementation group 1 peroxisomal disorders such as neonatal adrenoleukodystrophy, infantile Refsum disease, and Zellweger syndrome. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Sep 2013]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-92517968-G-A is Pathogenic according to our data. Variant chr7-92517968-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 371782.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr7-92517968-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PEX1	NM_000466.3	c.547C>T	p.Arg183Ter	stop_gained	5/24	ENST00000248633.9
PEX1	NM_001282677.2	c.547C>T	p.Arg183Ter	stop_gained	5/23
PEX1	XM_047420472.1	c.547C>T	p.Arg183Ter	stop_gained	5/23
PEX1	NM_001282678.2	c.-78C>T		5_prime_UTR_variant	5/24

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PEX1	ENST00000248633.9	c.547C>T	p.Arg183Ter	stop_gained	5/24	1	NM_000466.3	P1
PEX1	ENST00000428214.5	c.547C>T	p.Arg183Ter	stop_gained	5/23	1
PEX1	ENST00000438045.5	c.274-4001C>T		intron_variant		2
PEX1	ENST00000484913.5	n.586C>T		non_coding_transcript_exon_variant	5/24	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000805 AC: 2 AN: 248528 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 134836

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000100

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000331

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000343 AC: 5 AN: 1459500 Hom.: 0 Cov.: 33 AF XY: 0.00000413 AC XY: 3 AN XY: 725876

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000384

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000233

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000305 Hom.: 0

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000117 AC: 1

ExAC AF: 0.00000825 AC: 1

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Heimler syndrome 1 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

May 20, 2023

- -

Zellweger spectrum disorders Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 16, 2023

This sequence change creates a premature translational stop signal (p.Arg183*) in the PEX1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PEX1 are known to be pathogenic (PMID: 21031596, 26387595, 31831025). This variant is present in population databases (rs149806989, gnomAD 0.01%). This premature translational stop signal has been observed in individuals with Zellweger syndrome (PMID: 19105186). ClinVar contains an entry for this variant (Variation ID: 371782). For these reasons, this variant has been classified as Pathogenic. -

Peroxisome biogenesis disorder 1B;C4551980:Heimler syndrome 1;C4721541:Peroxisome biogenesis disorder 1A (Zellweger) Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jul 28, 2021

- -

Peroxisome biogenesis disorder Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

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

May 10, 2018

Variant summary: PEX1 c.547C>T (p.Arg183X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory (eg. c.2097dupT, p.Ile700fsX42; c.2368C>T, p.Arg790X; c.2916delA, p.Gly973fsX16). The variant allele was found at a frequency of 8.2e-06 in 244450 control chromosomes (gnomAD). This frequency is not significantly higher than expected for a pathogenic variant in PEX1 causing Zellweger Syndrome (8.2e-06 vs 3.90e-03), allowing no conclusion about variant significance. The variant, c.547C>T, has been reported in the literature in individuals affected with Zellweger Syndrome (Ebberink_2010, Yik_2009). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Peroxisome biogenesis disorder 1B Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Oct 11, 2016

- -

Peroxisome biogenesis disorder 1A (Zellweger) Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Oct 11, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.53
CADD	Pathogenic	35
DANN	Uncertain	1.0
Eigen	Pathogenic	0.77
Eigen_PC	Uncertain	0.58
FATHMM_MKL	Uncertain	0.96	D
MutationTaster	Benign	1.0	A;A;D
Vest4		0.46
GERP RS		4.8

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: rs149806989; hg19: chr7-92147282;