rs138568975

Variant names:

• chr17-35576182-CTG-C
• rs138568975
• NM_000286.3:c.681-3_681-2delCA

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 8P and 16B. PVS1 BP6_Very_Strong BS1 BS2

The NM_000286.3(PEX12):​c.681-3_681-2delCA variant causes a splice acceptor, splice region, intron change. The variant allele was found at a frequency of 0.00203 in 1,613,808 control chromosomes in the GnomAD database, including 42 homozygotes. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.010 (18 hom., cov: 32)
  • Exomes 𝑓: 0.0012 (24 hom.)
• Consequence: PEX12 NM_000286.3 splice_acceptor, splice_region, intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:6
• Conservation: PhyloP100: 6.49

Genes affected

PEX12 (HGNC:8854): (peroxisomal biogenesis factor 12) This gene belongs to the peroxin-12 family. Peroxins (PEXs) are proteins that are essential for the assembly of functional peroxisomes. The peroxisome biogenesis disorders (PBDs) are a group of genetically heterogeneous autosomal recessive, lethal diseases characterized by multiple defects in peroxisome function. The peroxisomal biogenesis disorders are a heterogeneous group with at least 14 complementation groups and with more than 1 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 are a cause of Zellweger syndrome (ZWS). [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease,
• BP6: Variant 17-35576182-CTG-C is Benign according to our data. Variant chr17-35576182-CTG-C is described in ClinVar as [Likely_benign]. Clinvar id is 92775.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0101 (1531/152254) while in subpopulation AFR AF= 0.0348 (1444/41536). AF 95% confidence interval is 0.0333. There are 18 homozygotes in gnomad4. There are 768 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 18 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PEX12	NM_000286.3	c.681-3_681-2delCA		splice_acceptor_variant, splice_region_variant, intron_variant	Intron 2 of 2	ENST00000225873.9	NP_000277.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PEX12	ENST00000225873.9	c.681-3_681-2delCA		splice_acceptor_variant, splice_region_variant, intron_variant	Intron 2 of 2	1	NM_000286.3	ENSP00000225873.3
PEX12	ENST00000586663.2	n.681-3_681-2delCA		splice_acceptor_variant, splice_region_variant, intron_variant	Intron 2 of 2	1		ENSP00000466894.2

Frequencies

GnomAD3 genomes AF: 0.0100 AC: 1525 AN: 152136 Hom.: 18 Cov.: 32

Gnomad AFR AF: 0.0347

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00380

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00813

GnomAD3 exomes AF: 0.00267 AC: 663 AN: 248770 Hom.: 10 AF XY: 0.00193 AC XY: 260 AN XY: 134684

Gnomad AFR exome AF: 0.0361

Gnomad AMR exome AF: 0.00176

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000196

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000629

Gnomad OTH exome AF: 0.00115

GnomAD4 exome AF: 0.00119 AC: 1737 AN: 1461554 Hom.: 24 AF XY: 0.00106 AC XY: 770 AN XY: 727064

Gnomad4 AFR exome AF: 0.0400

Gnomad4 AMR exome AF: 0.00186

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000174

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000836

Gnomad4 OTH exome AF: 0.00310

GnomAD4 genome AF: 0.0101 AC: 1531 AN: 152254 Hom.: 18 Cov.: 32 AF XY: 0.0103 AC XY: 768 AN XY: 74438

Gnomad4 AFR AF: 0.0348

Gnomad4 AMR AF: 0.00379

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000162

Gnomad4 OTH AF: 0.00804

Alfa AF: 0.00571 Hom.: 0

Bravo AF: 0.0115

Asia WGS AF: 0.00375 AC: 13 AN: 3478

EpiCase AF: 0.000164

EpiControl AF: 0.000119

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:3

Nov 06, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 14, 2016

Mayo Clinic Laboratories, Mayo Clinic

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Nov 18, 2020

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified Benign:2

Dec 20, 2021

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

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: PEX12 c.681-3_681-2delCA alters a nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. The variant allele was found at a frequency of 0.0027 in 248770 control chromosomes, predominantly at a frequency of 0.036 within the African or African-American subpopulation in the gnomAD database, including 10 homozygotes. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 22.77 fold of the estimated maximal expected allele frequency for a pathogenic variant in PEX12 causing Zellweger Syndrome phenotype (0.0016), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as benign/likely benign. Based on the evidence outlined above, the variant was classified as benign. -

Mar 11, 2013

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Peroxisome biogenesis disorder 3A (Zellweger) Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.47		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.47		Position offset: -7
DS_AL_spliceai		0.20		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs138568975; hg19: chr17-33903201;