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Genetic and clinical aspects of Zellweger spectrum patients with PEX1 mutations.

Authors: Rosewich, H  Ohlenbusch, A  Gartner, J 
Citation: Rosewich H, etal., J Med Genet. 2005 Sep;42(9):e58.
Pubmed: (View Article at PubMed) PMID:16141001
DOI: Full-text: DOI:10.1136/jmg.2005.033324

OBJECTIVE: To analyse the PEX1 gene, the most common cause for peroxisome biogenesis disorders (PBD), in a consecutive series of patients with Zellweger spectrum. METHODS: Mutations were detected by different methods including SSCP analyses as a screening technique on the basis of genomic or cDNA, followed by direct sequencing of PCR fragments with an abnormal electrophoresis pattern. RESULTS: 33 patients were studied. Two common mutations, c.2528G-->A, G843D and c.2098_2098insT, I700YfsX42, accounted for over 80% of all abnormal PEX1 alleles, emphasising their diagnostic relevance. Most PEX1 mutations were distributed over the two AAA cassettes with the two functional protein domains, D1 and D2, and the highly conserved Walker motifs. Phenotypic severity of Zellweger spectrum in CG1 depended on the effect of the mutation on the PEX1 protein, peroxin 1. PEX1 mutations could be divided into two classes of genotype-phenotype correlation: class I mutations led to residual PEX1 protein levels and function and a milder phenotype; class II mutations almost abolished PEX1 protein levels and function, resulting in a severe phenotype. Compound heterozygote patients for a class I and class II mutation had an intermediate phenotype. CONCLUSIONS: Molecular confirmation of the clinical and biochemical diagnosis will allow the prediction of the clinical course of disease in individual PBD cases.

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RGD Object Information
RGD ID: 11062374
Created: 2016-04-27
Species: All species
Last Modified: 2016-04-27
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.