Related Experiment Video
Updated: Oct 12, 2025
06:41
In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
Published on: August 20, 2019
13.8K
Edgetic Perturbations Contribute to Phenotypic Variability in PEX26 Deficiency
Amelie S Lotz-Havla1, Mathias Woidy2, Philipp Guder2
1Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University, Munich, Germany.
Frontiers in Genetics
|November 22, 2021
Summary
This study reveals PEX26 as a central hub in peroxisome function, uncovering new protein interactions and expanding its role in peroxisomal biogenesis and lipid metabolism, crucial for understanding Zellweger spectrum disorders.
Area of Science:
- Cell Biology
- Molecular Genetics
- Biochemistry
Background:
- Peroxisomes are vital organelles involved in numerous cellular processes, but the functions of many peroxisomal proteins and their interactions remain poorly understood.
- Defects in peroxisomal biogenesis (PBD) or metabolism cause severe inborn disorders, with mutations in PEX26 leading to Zellweger spectrum disorders.
- Limited knowledge of the peroxisomal protein interaction network hinders a complete understanding of cellular metabolism and disease mechanisms.
Purpose of the Study:
- To investigate the phenotypic complexity of PEX26 deficiency by analyzing its protein interactions and network.
- To identify novel protein-protein interactions involving PEX26 within the peroxisomal interactome.
- To elucidate the role of PEX26 in peroxisomal biogenesis, metabolism, and how genetic variants contribute to disease variability.
Main Methods:
- Organelle protein interaction screening and network medicine approach.
- Analysis of PEX26 interactions with other peroxisomal proteins.
- Investigation of PEX26 variant-specific effects on protein-protein interactions (edgetic perturbations).
Main Results:
- Identified 14 novel protein-protein interactions for PEX26, establishing it as a hub in the peroxisomal interactome.
- Demonstrated a strong correlation between PEX26 edgetic perturbations and the molecular phenotype of matrix protein import.
- Expanded the known functions of PEX26 to include matrix protein import, peroxisome division/proliferation, membrane assembly, and interaction with lipid metabolism.
Conclusions:
- PEX26 plays a critical, multifaceted role in peroxisomal biogenesis and function, extending beyond previous understanding.
- The PEX26 interaction network is intricately linked to cellular lipid metabolism.
- Refined genotype-phenotype correlations for PEX26 deficiency, offering insights into disease mechanisms and potential therapeutic targets.
Related Concept Videos
01:33Pleiotropy
41.5K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
41.5K
01:27Protein Import into the Peroxisomes
3.9K
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
3.9K
02:32Exon Recombination
3.7K
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon...
Exon shuffling follows “splice frame rules.” Each exon...
3.7K
02:32Position-effect Variegation
6.6K
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
6.6K
02:27Background and Environment Affect Phenotype
6.8K
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
6.8K
01:09Epistasis Analysis
5.4K
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
5.4K