Tau isoform expression and phosphorylation in marmoset brains

Area of Science:

• Neuroscience
• Biochemistry
• Primate Models

Background:

• Tau protein is crucial in neuronal function; hyperphosphorylated tau forms neurofibrillary tangles, a hallmark of Alzheimer's disease (AD).
• Tauopathies, including AD and frontotemporal lobar degeneration (FTLD), are linked to tau pathology.
• Nonhuman primates offer a more human-like model for neurodegenerative disease research than rodents.

Purpose of the Study:

• To investigate tau isoform expression and phosphorylation status in the common marmoset brain.
• To evaluate the marmoset as a potential nonhuman primate model for studying tauopathies and neurodegenerative diseases.

Main Methods:

• Biochemical analysis of tau expression and phosphorylation in marmoset brain tissue.
• Comparison of marmoset tau characteristics with human and mouse tau.

Main Results:

• Marmoset tau lacks the primate-specific N-terminal motif.
• Tau isoform expression in marmosets resembles mice, with adult brains expressing only four-repeat isoforms.
• Newborn marmoset brains exhibit tau phosphorylation at AD-associated sites, which is largely reduced in adults, except for Ser-202 and Ser-404.

Conclusions:

• The common marmoset displays distinct tau characteristics, differing from humans but sharing similarities with mice.
• The phosphorylation pattern in marmoset brains, particularly in newborns, suggests potential relevance for studying early-stage tau pathology.
• These findings establish key biochemical features of tau in marmosets, supporting their utility as a nonhuman primate model for neurodegenerative disease research.
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