The progeroid gene BubR1 regulates axon myelination and motor function

Area of Science:

• Neuroscience
• Cell Biology
• Genetics

Background:

• Myelination by oligodendrocytes is vital for central nervous system (CNS) signal transduction and motor control.
• Age-related myelin degeneration is common, but its molecular causes are not fully understood.
• BubR1, a mitotic checkpoint protein, influences lifespan and aging phenotypes.

Purpose of the Study:

• To investigate the role of BubR1 in axon myelination and associated motor function.
• To determine if BubR1 levels impact oligodendrocyte development and myelin integrity.

Main Methods:

• Utilized mutant mice with reduced BubR1 levels (BubR1H/H mice).
• Assessed oligodendrocyte progenitor cell proliferation and density.
• Quantified myelin-related gene expression (MBP, PLP1) in brain and spinal cord.
• Evaluated motor function, including strength, coordination, balance, gait, and activity levels.

Main Results:

• BubR1H/H mice showed significantly reduced oligodendrocyte progenitor cell proliferation and density.
• Axonal hypomyelination was observed in both the brain and spinal cord of BubR1H/H mice.
• Expression of myelin genes MBP and PLP1 was markedly decreased.
• BubR1H/H mice exhibited substantial motor deficits, including impaired strength, coordination, balance, and locomotion.

Conclusions:

• BubR1 is essential for oligodendrocyte production and maintaining myelin sheath integrity.
• Deficiency in BubR1 leads to hypomyelination and motor dysfunction.
• BubR1 emerges as a key factor in understanding age-related myelin degeneration.