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CNP deficiency causes severe hypomyelinating leukodystrophy in humans
Lama Al-Abdi1,2, Fathiya Al Murshedi3, Alaa Elmanzalawy4
1Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
A novel genetic mutation in the CNP gene causes a severe leukodystrophy in humans, characterized by profound white matter loss and neuroregression, mirroring a known mouse model.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- Myelin pathologies, including multiple sclerosis and leukodystrophy, are significant neurological disorders.
- CNP (2',3'-cyclic nucleotide 3'-phosphodiesterase) is crucial for myelin maintenance, with CNS expression limited to oligodendrocytes.
Observation:
- A consanguineous Omani family presented with a consistent phenotype of neuroregression and severe white matter loss.
- Affected individuals exhibited a novel homozygous missense variant in the CNP gene.
Findings:
- The identified CNP variant acts as a null allele in patient fibroblasts, leading to abnormal F-actin organization.
- This genetic defect results in a severe hypomyelinating leukodystrophy, a previously undescribed human condition.
Implications:
- Establishes a new human genetic disorder, CNP-related hypomyelinating leukodystrophy.
- Provides insights into the essential role of CNP in human myelin development and maintenance.
- Offers a potential target for future therapeutic strategies for leukodystrophies.
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