Related Experiment Video
Updated: Oct 25, 2025
In Vivo Modeling of the Morbid Human Genome using Danio rerio
Published on: August 24, 2013
A novel non-human primate model of Pelizaeus-Merzbacher disease
Larry S Sherman1, Weiping Su2, Amanda L Johnson3
1Divisions of Neuroscience Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR, United States of America; Department of Cell, Developmental and Cancer Biology, Oregon Health & Science University, Portland, OR, United States of America.
Abstract:
Pelizaeus-Merzbacher disease (PMD) is a severe hypomyelinating disorder of the central nervous system (CNS) linked to mutations in the proteolipid protein-1 (PLP1) gene. Although there are multiple animal models of PMD, few of them fully mimic the human disease. Here, we report three spontaneous cases of male neonatal rhesus macaques with the clinical symptoms of hypomyelinating disease, including intention tremors, progressively worsening motor dysfunction, and nystagmus. These animals demonstrated a paucity of CNS myelination accompanied by reactive astrogliosis, and a lack of PLP1 expression throughout white matter. Genetic analysis revealed that these animals were related to one another and that their parents carried a rare, hemizygous missense variant in exon 5 of the PLP1 gene. These animals therefore represent the first reported non-human primate model of PMD, providing a novel and valuable opportunity for preclinical studies that aim to promote myelination in pediatric hypomyelinating diseases.
Insights
Researchers identified a new animal model for Pelizaeus-Merzbacher disease (PMD), a central nervous system (CNS) disorder. Three rhesus macaques spontaneously developed PMD-like symptoms, offering a valuable model for future therapeutic studies.
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Pelizaeus-Merzbacher disease (PMD) is a severe genetic disorder affecting central nervous system (CNS) myelination.
- Mutations in the proteolipid protein-1 (PLP1) gene are the primary cause of PMD.
- Existing animal models do not fully replicate the human disease's complexities.
Purpose of the Study:
- To report the discovery and characterization of spontaneous cases of PMD in non-human primates.
- To establish a novel primate model for studying hypomyelinating disorders.
- To provide a platform for preclinical testing of therapies aimed at promoting myelination.
Main Methods:
- Clinical observation of neonatal rhesus macaques exhibiting neurological symptoms.
- Neuropathological examination of CNS tissue, including assessment of myelination and glial markers.
- Genetic analysis to identify mutations in the PLP1 gene.
Main Results:
- Three male neonatal rhesus macaques presented with tremors, motor dysfunction, and nystagmus.
- These animals showed reduced CNS myelination, reactive astrogliosis, and absent PLP1 expression.
- Genetic analysis identified a rare hemizygous missense variant in the PLP1 gene in affected animals and their parents.
Conclusions:
- The identified rhesus macaques represent the first non-human primate model of Pelizaeus-Merzbacher disease.
- This model offers a unique opportunity for preclinical research into treatments for pediatric hypomyelinating disorders.
- The findings underscore the importance of PLP1 in primate CNS development and myelination.
