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PEX3 is the causal gene responsible for peroxisome membrane assembly-defective Zellweger syndrome of complementation

K Ghaedi1, M Honsho, N Shimozawa

  • 1Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan; and CREST, Japan Science and Technology Corporation, Tokyo, Japan.

American Journal of Human Genetics
|September 1, 2000
PubMed

Insights

Peroxisome biogenesis disorders (PBDs) are genetic diseases impacting peroxisome assembly. This study identifies the PEX3 gene mutation as a cause of a specific PBD subtype, offering insights into disease mechanisms.

Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • Peroxisome biogenesis disorders (PBDs) are a group of severe autosomal recessive diseases.
  • Defects in peroxisome assembly lead to conditions like Zellweger syndrome (ZS).
  • Thirteen genotypes of PBDs have been identified, highlighting genetic heterogeneity.

Purpose of the Study:

  • To identify the genetic cause of a specific PBD subtype, complementation group G (CG-G) Zellweger syndrome.
  • To investigate the role of the PEX3 gene in peroxisome assembly and PBD pathogenesis.

Main Methods:

  • Fibroblast culture from a patient with CG-G ZS (PBDG-02).
  • Expression of human peroxin Pex3p cDNA in patient fibroblasts and a Chinese hamster ovary (CHO) pex3 mutant cell line.
  • Genomic PCR analysis to identify mutations in the PEX3 gene.

Main Results:

  • Expression of Pex3p restored peroxisome biogenesis in patient fibroblasts.
  • The PBDG-02 patient had a homozygous inactivating mutation in the PEX3 gene: a 97-bp deletion causing a frameshift and premature termination.
  • Genomic analysis revealed a splice site mutation affecting exon 11 of the PEX3 gene.
  • PEX3 cDNA derived from the patient's fibroblasts showed defective peroxisome-restoring activity.

Conclusions:

  • The PEX3 gene is a novel pathogenic gene responsible for complementation group G (CG-G) PBDs.
  • Mutations in PEX3 disrupt peroxisome assembly, leading to PBDs.
  • This finding advances the understanding of PBD genetics and provides a molecular basis for CG-G ZS.

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