Fetal hydrops
Gene: PEX6For Peroxisome biogenesis disorder 4B (OMIM:614863), Falkenberg et al (PMID: 29220678) has identified Allelic Expression Imbalance (AEI) as a mechanism responsible for the condition. Affected patients (7 unrelated cases) were monoallelic for rs61753230 (c.2578C>T, p.Arg860Trp) and rs144286892 (c.∗442_445 delTAAA), with these variants being on the same chromosome (cis). It would appear that rs144286892 causes the over expression of the allele that it is on, resulting in over expression of rs61753230. The unaffected parents analysed were monoallelic for rs61753230 and biallelic for rs144286892, resulting in overexpression of both rs61753230 and wild type alleles (PMID: 29220678). Experimental evidence revealed that rs61753230 has a dominant-negative effect on the function of the PEX1- PEX6 complex in peroxisomal matrix protein import (PMID: 29220678).Created: 1 Apr 2022, 3:43 p.m. | Last Modified: 1 Apr 2022, 3:43 p.m.
Panel Version: 1.54
Comment on mode of inheritance: The mode of inheritance for PEX6 should be set to: BOTH monoallelic and biallelic, autosomal or pseudoautosomal, in order to detect the dominant Peroxisome biogenesis disorder 4B (OMIM:614863). Incomplete penetrance has been noted for this gene, in order to highlight that unaffected parents may also carry rs61753230.Created: 1 Apr 2022, 3:42 p.m. | Last Modified: 8 Sep 2022, 1:50 p.m.
Panel Version: 1.55
Mode of inheritance
BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mode of pathogenicity
Other
Comment on list classification: Updated rating from Red to Green: PMID:20033294 (Dursun et al., 2009) and other reviews (e.g. Table 3 of PMID:23137060) suggest that peroxisomal disorders should be considered in the etiology of hydrops fetalis. PEX6 is on the NGS Non-immune Hydrops Panel for Greenwood Genetic centre: http://www.ggc.org/images/NGS_Hydrops_Panel_Genes_and_Conditions.pdf.Created: 21 Dec 2016, 2:01 p.m.
Tag Q1_22_MOI was removed from gene: PEX6.
Mode of inheritance for gene: PEX6 was changed from BIALLELIC, autosomal or pseudoautosomal to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Penetrance for gene PEX6 was set from to Complete
Publications for gene: PEX6 were set to 20033294; 23137060
Mode of inheritance for gene: PEX6 was changed from BIALLELIC, autosomal or pseudoautosomal to BIALLELIC, autosomal or pseudoautosomal
Tag Q1_22_MOI tag was added to gene: PEX6.
Phenotypes for gene: PEX6 were changed from Zellweger, peroxisome biogenesis disorder 4A, 4B; Peroxisome biogenesis disorder 4A (Zellweger), 614862; Peroxisome biogenesis disorder 4B, 614863 to Peroxisome biogenesis disorder 4A (Zellweger), OMIM:614862; Peroxisome biogenesis disorder 4B, OMIM:614863
Publications for gene: PEX6 were set to
21 December 2016. External reviews were assessed, and panel was revised according to expert review, internal discussion and additional curation. Following internal discussion, all genes from the V1.14 'RASopathies' panel were added as green EXCLUDING NF1 and SPRED1- a cautious approach was taken because Fetal hydrops is a fetal panel. All relevant genes from the 'Mucopolysaccharideosis, Gaucher, Fabry' V1.0 panel (lysosomal storage disorders) were also added to the Fetal hydrops panel as green together with genes from the literature where there is a reasonable link between the corresponding lysosomal storage disorder (LSD) and Fetal hydrops. All PEX genes from the V1.2 'Peroxisomal disorders' panel were added as green based on a link between peroxisomal biogenesis disorders and Fetal hydrops.
This gene has been classified as Green List (High Evidence).
PEX6 was added to Fetal hydropspanel. Sources: Other
PEX6 was created by rfoulger